Update README with Docker deployment instructions and auth features

- Added comprehensive Docker Compose deployment section as recommended method
- Documented automatic database migrations and persistent storage
- Updated architecture section to mention SQLite auth system
- Added new User Experience section highlighting session management
- Reorganized development setup with local database migration instructions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/docker.yml

@@ -0,0 +1,34 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.DOCKER_REGISTRY }}
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ secrets.DOCKER_REGISTRY }}/calendar:latest
+            ${{ secrets.DOCKER_REGISTRY }}/calendar:${{ github.sha }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.gitignore

@@ -22,3 +22,9 @@ dist/
 CLAUDE.md
 
 data/
+
+# SQLite database
+*.db
+*.db-shm
+*.db-wal
+calendar.db

Dockerfile

@@ -47,6 +47,9 @@ FROM rust:alpine AS backend-builder
 WORKDIR /app
 RUN apk add --no-cache musl-dev pkgconfig openssl-dev openssl-libs-static
 
+# Install sqlx-cli for migrations
+RUN cargo install sqlx-cli --no-default-features --features sqlite
+
 # Copy shared models
 COPY calendar-models ./calendar-models
 
@@ -76,19 +79,29 @@ RUN cargo build --release --bin backend
 FROM alpine:latest
 
 # Install runtime dependencies
-RUN apk add --no-cache ca-certificates tzdata
+RUN apk add --no-cache ca-certificates tzdata sqlite
 
 # Copy frontend files to temporary location
 COPY --from=builder /app/frontend/dist /app/frontend-dist
 
-# Copy backend binary (built in workspace root)
+# Copy backend binary and sqlx-cli
 COPY --from=backend-builder /app/target/release/backend /usr/local/bin/backend
+COPY --from=backend-builder /usr/local/cargo/bin/sqlx /usr/local/bin/sqlx
 
-# Create startup script to copy frontend files to shared volume
+# Copy migrations for database setup
-RUN mkdir -p /srv/www
+COPY --from=backend-builder /app/backend/migrations /migrations
+
+# Create startup script to copy frontend files, run migrations, and start backend
+RUN mkdir -p /srv/www /db
 RUN echo '#!/bin/sh' > /usr/local/bin/start.sh && \
+    echo 'echo "Copying frontend files..."' >> /usr/local/bin/start.sh && \
     echo 'cp -r /app/frontend-dist/* /srv/www/' >> /usr/local/bin/start.sh && \
+    echo 'echo "Ensuring database directory exists..."' >> /usr/local/bin/start.sh && \
+    echo 'mkdir -p /db && chmod 755 /db' >> /usr/local/bin/start.sh && \
+    echo 'echo "Running database migrations..."' >> /usr/local/bin/start.sh && \
+    echo 'sqlx migrate run --database-url "sqlite:///db/calendar.db" --source /migrations || echo "Migration failed but continuing..."' >> /usr/local/bin/start.sh && \
     echo 'echo "Starting backend server..."' >> /usr/local/bin/start.sh && \
+    echo 'export DATABASE_URL="sqlite:///db/calendar.db"' >> /usr/local/bin/start.sh && \
     echo '/usr/local/bin/backend' >> /usr/local/bin/start.sh && \
     chmod +x /usr/local/bin/start.sh
 

README.md

@@ -29,6 +29,12 @@ While there are many excellent self-hosted CalDAV server implementations (Nextcl
 - **Real-time Updates**: Seamless synchronization with CalDAV servers
 - **Timezone Aware**: Proper local time display with UTC storage
 
+### User Experience
+- **Persistent Preferences**: Settings sync across devices and sessions
+- **Remember Me**: Optional server/username remembering for convenience
+- **Session Management**: Secure session tokens with automatic expiry
+- **Cross-Device Sync**: User preferences stored in database, not just browser
+
 ## Architecture
 
 ### Frontend (Yew WebAssembly)
@@ -40,7 +46,8 @@ While there are many excellent self-hosted CalDAV server implementations (Nextcl
 
 ### Backend (Axum)  
 - **Framework**: Axum async web framework with CORS support
-- **Authentication**: JWT token management and validation
+- **Authentication**: SQLite-backed session management with JWT tokens
+- **Database**: SQLite for user preferences and session storage
 - **CalDAV Client**: Full CalDAV protocol implementation for server sync
 - **API Design**: RESTful endpoints following calendar operation patterns
 - **Data Flow**: Proxy between frontend and CalDAV servers with proper authentication
@@ -54,12 +61,36 @@ While there are many excellent self-hosted CalDAV server implementations (Nextcl
 
 ## Getting Started
 
-### Prerequisites
+### Docker Deployment (Recommended)
 
+The easiest way to run the calendar is using Docker Compose:
+
+1. **Clone the repository**:
+   ```bash
+   git clone <repository-url>
+   cd calendar
+   ```
+
+2. **Start the application**:
+   ```bash
+   docker compose up
+   ```
+
+3. **Access the application** at `http://localhost`
+
+The Docker setup includes:
+- **Automatic database migrations** on startup
+- **Persistent data storage** in `./data/db/` volume
+- **Frontend served via Caddy** on port 80
+- **Backend API** accessible on port 3000
+
+### Development Setup
+
+#### Prerequisites
 - Rust (latest stable version)
 - Trunk (`cargo install trunk`)
 
-### Development Setup
+#### Local Development
 
 1. **Start the backend server** (serves API at http://localhost:3000):
    ```bash
@@ -73,6 +104,17 @@ While there are many excellent self-hosted CalDAV server implementations (Nextcl
 
 3. **Access the application** at `http://localhost:8080`
 
+#### Database Setup
+
+For local development, run the database migrations:
+```bash
+# Install sqlx-cli if not already installed
+cargo install sqlx-cli --features sqlite
+
+# Run migrations
+sqlx migrate run --database-url "sqlite:calendar.db" --source backend/migrations
+```
+
 ### Building for Production
 
 ```bash

backend/Cargo.toml

@@ -34,6 +34,10 @@ base64 = "0.21"
 thiserror = "1.0"
 lazy_static = "1.4"
 
+# Database dependencies
+sqlx = { version = "0.7", features = ["runtime-tokio", "sqlite", "uuid", "chrono", "json"] }
+tokio-rusqlite = "0.5"
+
 [dev-dependencies]
 tokio = { version = "1.0", features = ["macros", "rt"] }
 reqwest = { version = "0.11", features = ["json"] }

backend/migrations/001_create_users_table.sql

@@ -0,0 +1,8 @@
+-- Create users table
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY,
+    username TEXT NOT NULL,
+    server_url TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    UNIQUE(username, server_url)
+);

backend/migrations/002_create_sessions_table.sql

@@ -0,0 +1,16 @@
+-- Create sessions table
+CREATE TABLE IF NOT EXISTS sessions (
+    id TEXT PRIMARY KEY,
+    user_id TEXT NOT NULL,
+    token TEXT NOT NULL UNIQUE,
+    created_at TEXT NOT NULL,
+    expires_at TEXT NOT NULL,
+    last_accessed TEXT NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Index for faster token lookups
+CREATE INDEX IF NOT EXISTS idx_sessions_token ON sessions(token);
+
+-- Index for cleanup of expired sessions
+CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON sessions(expires_at);

backend/migrations/003_create_user_preferences_table.sql

@@ -0,0 +1,11 @@
+-- Create user preferences table
+CREATE TABLE IF NOT EXISTS user_preferences (
+    user_id TEXT PRIMARY KEY,
+    calendar_selected_date TEXT,
+    calendar_time_increment INTEGER,
+    calendar_view_mode TEXT,
+    calendar_theme TEXT,
+    calendar_colors TEXT, -- JSON string for calendar color mappings
+    updated_at TEXT NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);

backend/src/auth.rs

@@ -1,10 +1,12 @@
 use chrono::{Duration, Utc};
 use jsonwebtoken::{decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation};
 use serde::{Deserialize, Serialize};
+use uuid::Uuid;
 
-use crate::models::{CalDAVLoginRequest, AuthResponse, ApiError};
-use crate::config::CalDAVConfig;
 use crate::calendar::CalDAVClient;
+use crate::config::CalDAVConfig;
+use crate::db::{Database, PreferencesRepository, Session, SessionRepository, UserRepository};
+use crate::models::{ApiError, AuthResponse, CalDAVLoginRequest, UserPreferencesResponse};
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Claims {
@@ -17,11 +19,12 @@ pub struct Claims {
 #[derive(Clone)]
 pub struct AuthService {
     jwt_secret: String,
+    db: Database,
 }
 
 impl AuthService {
-    pub fn new(jwt_secret: String) -> Self {
+    pub fn new(jwt_secret: String, db: Database) -> Self {
-        Self { jwt_secret }
+        Self { jwt_secret, db }
     }
 
     /// Authenticate user directly against CalDAV server
@@ -31,13 +34,11 @@ impl AuthService {
         println!("✅ Input validation passed");
 
         // Create CalDAV config with provided credentials
-        let caldav_config = CalDAVConfig {
+        let caldav_config = CalDAVConfig::new(
-            server_url: request.server_url.clone(),
+            request.server_url.clone(),
-            username: request.username.clone(),
+            request.username.clone(),
-            password: request.password.clone(),
+            request.password.clone(),
-            calendar_path: None,
+        );
-            tasks_path: None,
-        };
         println!("📝 Created CalDAV config");
 
         // Test authentication against CalDAV server
@@ -47,20 +48,59 @@ impl AuthService {
         // Try to discover calendars as an authentication test
         match caldav_client.discover_calendars().await {
             Ok(calendars) => {
-                println!("✅ Authentication successful! Found {} calendars", calendars.len());
+                println!(
-                // Authentication successful, generate JWT token
+                    "✅ Authentication successful! Found {} calendars",
-                let token = self.generate_token(&request.username, &request.server_url)?;
+                    calendars.len()
+                );
+                
+                // Find or create user in database
+                let user_repo = UserRepository::new(&self.db);
+                let user = user_repo
+                    .find_or_create(&request.username, &request.server_url)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to create user: {}", e)))?;
+                
+                // Generate JWT token
+                let jwt_token = self.generate_token(&request.username, &request.server_url)?;
+                
+                // Generate session token
+                let session_token = format!("sess_{}", Uuid::new_v4());
+                
+                // Create session in database
+                let session = Session::new(user.id.clone(), session_token.clone(), 24);
+                let session_repo = SessionRepository::new(&self.db);
+                session_repo
+                    .create(&session)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to create session: {}", e)))?;
+                
+                // Get or create user preferences
+                let prefs_repo = PreferencesRepository::new(&self.db);
+                let preferences = prefs_repo
+                    .get_or_create(&user.id)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
                 
                 Ok(AuthResponse {
-                    token,
+                    token: jwt_token,
+                    session_token,
                     username: request.username,
                     server_url: request.server_url,
+                    preferences: UserPreferencesResponse {
+                        calendar_selected_date: preferences.calendar_selected_date,
+                        calendar_time_increment: preferences.calendar_time_increment,
+                        calendar_view_mode: preferences.calendar_view_mode,
+                        calendar_theme: preferences.calendar_theme,
+                        calendar_colors: preferences.calendar_colors,
+                    },
                 })
             }
             Err(err) => {
                 println!("❌ Authentication failed: {:?}", err);
                 // Authentication failed
-                Err(ApiError::Unauthorized("Invalid CalDAV credentials or server unavailable".to_string()))
+                Err(ApiError::Unauthorized(
+                    "Invalid CalDAV credentials or server unavailable".to_string(),
+                ))
             }
         }
     }
@@ -71,16 +111,18 @@ impl AuthService {
     }
 
     /// Create CalDAV config from token
-    pub fn caldav_config_from_token(&self, token: &str, password: &str) -> Result<CalDAVConfig, ApiError> {
+    pub fn caldav_config_from_token(
+        &self,
+        token: &str,
+        password: &str,
+    ) -> Result<CalDAVConfig, ApiError> {
         let claims = self.verify_token(token)?;
 
-        Ok(CalDAVConfig {
+        Ok(CalDAVConfig::new(
-            server_url: claims.server_url,
+            claims.server_url,
-            username: claims.username,
+            claims.username,
-            password: password.to_string(),
+            password.to_string(),
-            calendar_path: None,
+        ))
-            tasks_path: None,
-        })
     }
 
     fn validate_login(&self, request: &CalDAVLoginRequest) -> Result<(), ApiError> {
@@ -97,8 +139,11 @@ impl AuthService {
         }
 
         // Basic URL validation
-        if !request.server_url.starts_with("http://") && !request.server_url.starts_with("https://") {
+        if !request.server_url.starts_with("http://") && !request.server_url.starts_with("https://")
-            return Err(ApiError::BadRequest("Server URL must start with http:// or https://".to_string()));
+        {
+            return Err(ApiError::BadRequest(
+                "Server URL must start with http:// or https://".to_string(),
+            ));
         }
 
         Ok(())
@@ -135,4 +180,33 @@ impl AuthService {
 
         Ok(token_data.claims)
     }
+    
+    /// Validate session token
+    pub async fn validate_session(&self, session_token: &str) -> Result<String, ApiError> {
+        let session_repo = SessionRepository::new(&self.db);
+        
+        let session = session_repo
+            .find_by_token(session_token)
+            .await
+            .map_err(|e| ApiError::Database(format!("Failed to find session: {}", e)))?
+            .ok_or_else(|| ApiError::Unauthorized("Invalid session token".to_string()))?;
+        
+        if session.is_expired() {
+            return Err(ApiError::Unauthorized("Session expired".to_string()));
+        }
+        
+        Ok(session.user_id)
+    }
+    
+    /// Logout user by deleting session
+    pub async fn logout(&self, session_token: &str) -> Result<(), ApiError> {
+        let session_repo = SessionRepository::new(&self.db);
+        
+        session_repo
+            .delete(session_token)
+            .await
+            .map_err(|e| ApiError::Database(format!("Failed to delete session: {}", e)))?;
+        
+        Ok(())
+    }
 }

backend/src/calendar.rs

@@ -1,9 +1,9 @@
+use calendar_models::{CalendarUser, EventClass, EventStatus, VAlarm, VEvent};
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::sync::Arc;
 use tokio::sync::Mutex;
-use calendar_models::{VEvent, EventStatus, EventClass, CalendarUser, VAlarm};
 
 // Global mutex to serialize CalDAV HTTP requests to prevent race conditions
 lazy_static::lazy_static! {
@@ -128,7 +128,10 @@ impl CalDAVClient {
     ///
     /// This method performs a REPORT request to get calendar data and parses
     /// the returned iCalendar format into CalendarEvent structs.
-    pub async fn fetch_events(&self, calendar_path: &str) -> Result<Vec<CalendarEvent>, CalDAVError> {
+    pub async fn fetch_events(
+        &self,
+        calendar_path: &str,
+    ) -> Result<Vec<CalendarEvent>, CalDAVError> {
         // CalDAV REPORT request to get calendar events
         let report_body = r#"<?xml version="1.0" encoding="utf-8" ?>
 <c:calendar-query xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
@@ -149,7 +152,11 @@ impl CalDAVClient {
             // Extract the base URL (scheme + host + port) from server_url
             let server_url = &self.config.server_url;
             // Find the first '/' after "https://" or "http://"
-            let scheme_end = if server_url.starts_with("https://") { 8 } else { 7 };
+            let scheme_end = if server_url.starts_with("https://") {
+                8
+            } else {
+                7
+            };
             if let Some(path_start) = server_url[scheme_end..].find('/') {
                 let base_url = &server_url[..scheme_end + path_start];
                 format!("{}{}", base_url, calendar_path)
@@ -163,7 +170,8 @@ impl CalDAVClient {
         println!("🔑 REPORT Basic Auth: Basic {}", basic_auth);
         println!("🌐 REPORT URL: {}", url);
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .request(reqwest::Method::from_bytes(b"REPORT").unwrap(), &url)
             .header("Authorization", format!("Basic {}", basic_auth))
             .header("Content-Type", "application/xml")
@@ -183,7 +191,11 @@ impl CalDAVClient {
     }
 
     /// Parse CalDAV XML response containing calendar data
-    fn parse_calendar_response(&self, xml_response: &str, calendar_path: &str) -> Result<Vec<CalendarEvent>, CalDAVError> {
+    fn parse_calendar_response(
+        &self,
+        xml_response: &str,
+        calendar_path: &str,
+    ) -> Result<Vec<CalendarEvent>, CalDAVError> {
         let mut events = Vec::new();
 
         // Extract calendar data from XML response
@@ -205,7 +217,11 @@ impl CalDAVClient {
     }
 
     /// Fetch a single calendar event by UID from the CalDAV server
-    pub async fn fetch_event_by_uid(&self, calendar_path: &str, uid: &str) -> Result<Option<CalendarEvent>, CalDAVError> {
+    pub async fn fetch_event_by_uid(
+        &self,
+        calendar_path: &str,
+        uid: &str,
+    ) -> Result<Option<CalendarEvent>, CalDAVError> {
         // First fetch all events and find the one with matching UID
         let events = self.fetch_events(calendar_path).await?;
 
@@ -225,10 +241,16 @@ impl CalDAVClient {
             if let Some(end_pos) = response_block.find("</d:response>") {
                 let response_content = &response_block[..end_pos];
 
-                let href = self.extract_xml_content(response_content, "href").unwrap_or_default();
+                let href = self
-                let etag = self.extract_xml_content(response_content, "getetag").unwrap_or_default();
+                    .extract_xml_content(response_content, "href")
+                    .unwrap_or_default();
+                let etag = self
+                    .extract_xml_content(response_content, "getetag")
+                    .unwrap_or_default();
 
-                if let Some(calendar_data) = self.extract_xml_content(response_content, "cal:calendar-data") {
+                if let Some(calendar_data) =
+                    self.extract_xml_content(response_content, "cal:calendar-data")
+                {
                     sections.push(CalendarDataSection {
                         href: if href.is_empty() { None } else { Some(href) },
                         etag: if etag.is_empty() { None } else { Some(etag) },
@@ -246,11 +268,27 @@ impl CalDAVClient {
         // Handle both with and without namespace prefixes
         let patterns = [
             format!("(?s)<{}>(.*?)</{}>", tag, tag), // <tag>content</tag>
-            format!("(?s)<{}>(.*?)</.*:{}>", tag, tag.split(':').last().unwrap_or(tag)),  // <tag>content</ns:tag>
+            format!(
-            format!("(?s)<.*:{}>(.*?)</{}>", tag.split(':').last().unwrap_or(tag), tag), // <ns:tag>content</tag>
+                "(?s)<{}>(.*?)</.*:{}>",
-            format!("(?s)<.*:{}>(.*?)</.*:{}>", tag.split(':').last().unwrap_or(tag), tag.split(':').last().unwrap_or(tag)), // <ns:tag>content</ns:tag>
+                tag,
+                tag.split(':').last().unwrap_or(tag)
+            ), // <tag>content</ns:tag>
+            format!(
+                "(?s)<.*:{}>(.*?)</{}>",
+                tag.split(':').last().unwrap_or(tag),
+                tag
+            ), // <ns:tag>content</tag>
+            format!(
+                "(?s)<.*:{}>(.*?)</.*:{}>",
+                tag.split(':').last().unwrap_or(tag),
+                tag.split(':').last().unwrap_or(tag)
+            ), // <ns:tag>content</ns:tag>
             format!("(?s)<{}[^>]*>(.*?)</{}>", tag, tag), // <tag attr>content</tag>
-            format!("(?s)<{}[^>]*>(.*?)</.*:{}>", tag, tag.split(':').last().unwrap_or(tag)),
+            format!(
+                "(?s)<{}[^>]*>(.*?)</.*:{}>",
+                tag,
+                tag.split(':').last().unwrap_or(tag)
+            ),
         ];
 
         for pattern in &patterns {
@@ -287,21 +325,29 @@ impl CalDAVClient {
     }
 
     /// Parse a single iCal event into a CalendarEvent struct
-    fn parse_ical_event(&self, event: ical::parser::ical::component::IcalEvent) -> Result<CalendarEvent, CalDAVError> {
+    fn parse_ical_event(
+        &self,
+        event: ical::parser::ical::component::IcalEvent,
+    ) -> Result<CalendarEvent, CalDAVError> {
         let mut properties: HashMap<String, String> = HashMap::new();
 
         // Extract all properties from the event
         for property in &event.properties {
-            properties.insert(property.name.to_uppercase(), property.value.clone().unwrap_or_default());
+            properties.insert(
+                property.name.to_uppercase(),
+                property.value.clone().unwrap_or_default(),
+            );
         }
 
         // Required UID field
-        let uid = properties.get("UID")
+        let uid = properties
+            .get("UID")
             .ok_or_else(|| CalDAVError::ParseError("Missing UID field".to_string()))?
             .clone();
 
         // Parse start time (required)
-        let start = properties.get("DTSTART")
+        let start = properties
+            .get("DTSTART")
             .ok_or_else(|| CalDAVError::ParseError("Missing DTSTART field".to_string()))?;
         let start = self.parse_datetime(start, properties.get("DTSTART"))?;
 
@@ -316,12 +362,14 @@ impl CalDAVClient {
         };
 
         // Determine if it's an all-day event
-        let all_day = properties.get("DTSTART")
+        let all_day = properties
+            .get("DTSTART")
             .map(|s| !s.contains("T"))
             .unwrap_or(false);
 
         // Parse status
-        let status = properties.get("STATUS")
+        let status = properties
+            .get("STATUS")
             .map(|s| match s.to_uppercase().as_str() {
                 "TENTATIVE" => EventStatus::Tentative,
                 "CANCELLED" => EventStatus::Cancelled,
@@ -330,7 +378,8 @@ impl CalDAVClient {
             .unwrap_or(EventStatus::Confirmed);
 
         // Parse classification
-        let class = properties.get("CLASS")
+        let class = properties
+            .get("CLASS")
             .map(|s| match s.to_uppercase().as_str() {
                 "PRIVATE" => EventClass::Private,
                 "CONFIDENTIAL" => EventClass::Confidential,
@@ -339,20 +388,24 @@ impl CalDAVClient {
             .unwrap_or(EventClass::Public);
 
         // Parse priority
-        let priority = properties.get("PRIORITY")
+        let priority = properties
+            .get("PRIORITY")
             .and_then(|s| s.parse::<u8>().ok())
             .filter(|&p| p <= 9);
 
         // Parse categories
-        let categories = properties.get("CATEGORIES")
+        let categories = properties
+            .get("CATEGORIES")
             .map(|s| s.split(',').map(|c| c.trim().to_string()).collect())
             .unwrap_or_default();
 
         // Parse dates
-        let created = properties.get("CREATED")
+        let created = properties
+            .get("CREATED")
             .and_then(|s| self.parse_datetime(s, None).ok());
 
-        let last_modified = properties.get("LAST-MODIFIED")
+        let last_modified = properties
+            .get("LAST-MODIFIED")
             .and_then(|s| self.parse_datetime(s, None).ok());
 
         // Parse exception dates (EXDATE)
@@ -403,7 +456,10 @@ impl CalDAVClient {
     }
 
     /// Parse VALARM components from an iCal event
-    fn parse_valarms(&self, event: &ical::parser::ical::component::IcalEvent) -> Result<Vec<VAlarm>, CalDAVError> {
+    fn parse_valarms(
+        &self,
+        event: &ical::parser::ical::component::IcalEvent,
+    ) -> Result<Vec<VAlarm>, CalDAVError> {
         let mut alarms = Vec::new();
 
         for alarm in &event.alarms {
@@ -416,20 +472,30 @@ impl CalDAVClient {
     }
 
     /// Parse a single VALARM component into a VAlarm
-    fn parse_single_valarm(&self, alarm: &ical::parser::ical::component::IcalAlarm) -> Result<VAlarm, CalDAVError> {
+    fn parse_single_valarm(
+        &self,
+        alarm: &ical::parser::ical::component::IcalAlarm,
+    ) -> Result<VAlarm, CalDAVError> {
         let mut properties: HashMap<String, String> = HashMap::new();
 
         // Extract all properties from the alarm
         for property in &alarm.properties {
-            properties.insert(property.name.to_uppercase(), property.value.clone().unwrap_or_default());
+            properties.insert(
+                property.name.to_uppercase(),
+                property.value.clone().unwrap_or_default(),
+            );
         }
 
         // Parse ACTION (required)
         let action = match properties.get("ACTION").map(|s| s.to_uppercase()) {
-            Some(ref action_str) if action_str == "DISPLAY" => calendar_models::AlarmAction::Display,
+            Some(ref action_str) if action_str == "DISPLAY" => {
+                calendar_models::AlarmAction::Display
+            }
             Some(ref action_str) if action_str == "EMAIL" => calendar_models::AlarmAction::Email,
             Some(ref action_str) if action_str == "AUDIO" => calendar_models::AlarmAction::Audio,
-            Some(ref action_str) if action_str == "PROCEDURE" => calendar_models::AlarmAction::Procedure,
+            Some(ref action_str) if action_str == "PROCEDURE" => {
+                calendar_models::AlarmAction::Procedure
+            }
             _ => calendar_models::AlarmAction::Display, // Default
         };
 
@@ -498,10 +564,7 @@ impl CalDAVClient {
         // Note: paths should be relative to the server URL base
         let user_calendar_path = format!("/calendars/{}/", self.config.username);
 
-        let discovery_paths = vec![
+        let discovery_paths = vec!["/calendars/", user_calendar_path.as_str()];
-            "/calendars/",
-            user_calendar_path.as_str(),
-        ];
 
         let mut all_calendars = Vec::new();
 
@@ -533,9 +596,13 @@ impl CalDAVClient {
 
         let url = format!("{}{}", self.config.server_url.trim_end_matches('/'), path);
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &url)
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .header("Content-Type", "application/xml")
             .header("Depth", "2") // Deeper search to find actual calendars
             .header("User-Agent", "calendar-app/0.1.0")
@@ -545,7 +612,11 @@ impl CalDAVClient {
             .map_err(CalDAVError::RequestError)?;
 
         if response.status().as_u16() != 207 {
-            println!("❌ Discovery PROPFIND failed for {}: HTTP {}", path, response.status().as_u16());
+            println!(
+                "❌ Discovery PROPFIND failed for {}: HTTP {}",
+                path,
+                response.status().as_u16()
+            );
             return Err(CalDAVError::ServerError(response.status().as_u16()));
         }
 
@@ -565,19 +636,26 @@ impl CalDAVClient {
 
                     // Check if this is a calendar collection by looking for supported-calendar-component-set
                     // This indicates it's an actual calendar that can contain events
-                    let has_supported_components = response_content.contains("supported-calendar-component-set") &&
+                    let has_supported_components = response_content
-                                                  (response_content.contains("VEVENT") || response_content.contains("VTODO"));
+                        .contains("supported-calendar-component-set")
-                    let has_calendar_resourcetype = response_content.contains("<cal:calendar") || response_content.contains("<c:calendar");
+                        && (response_content.contains("VEVENT")
+                            || response_content.contains("VTODO"));
+                    let has_calendar_resourcetype = response_content.contains("<cal:calendar")
+                        || response_content.contains("<c:calendar");
 
                     let is_calendar = has_supported_components || has_calendar_resourcetype;
 
                     // Also check resourcetype for collection
-                    let has_collection = response_content.contains("<d:collection") || response_content.contains("<collection");
+                    let has_collection = response_content.contains("<d:collection")
+                        || response_content.contains("<collection");
 
                     if is_calendar && has_collection {
                         // Exclude system directories like inbox, outbox, and root calendar directories
-                        if !href.contains("/inbox/") && !href.contains("/outbox/") && 
+                        if !href.contains("/inbox/")
-                           !href.ends_with("/calendars/") && href.ends_with('/') {
+                            && !href.contains("/outbox/")
+                            && !href.ends_with("/calendars/")
+                            && href.ends_with('/')
+                        {
                             println!("📅 Found calendar collection: {}", href);
                             calendar_paths.push(href);
                         } else {
@@ -595,7 +673,11 @@ impl CalDAVClient {
     }
 
     /// Parse iCal datetime format
-    fn parse_datetime(&self, datetime_str: &str, _original_property: Option<&String>) -> Result<DateTime<Utc>, CalDAVError> {
+    fn parse_datetime(
+        &self,
+        datetime_str: &str,
+        _original_property: Option<&String>,
+    ) -> Result<DateTime<Utc>, CalDAVError> {
         use chrono::TimeZone;
 
         // Handle different iCal datetime formats
@@ -617,7 +699,10 @@ impl CalDAVClient {
             }
         }
 
-        Err(CalDAVError::ParseError(format!("Unable to parse datetime: {}", datetime_str)))
+        Err(CalDAVError::ParseError(format!(
+            "Unable to parse datetime: {}",
+            datetime_str
+        )))
     }
 
     /// Parse EXDATE properties from an iCal event
@@ -643,7 +728,12 @@ impl CalDAVClient {
     }
 
     /// Create a new calendar on the CalDAV server using MKCALENDAR
-    pub async fn create_calendar(&self, name: &str, description: Option<&str>, color: Option<&str>) -> Result<(), CalDAVError> {
+    pub async fn create_calendar(
+        &self,
+        name: &str,
+        description: Option<&str>,
+        color: Option<&str>,
+    ) -> Result<(), CalDAVError> {
         // Sanitize calendar name for URL path
         let calendar_id = name
             .chars()
@@ -652,17 +742,27 @@ impl CalDAVClient {
             .to_lowercase();
 
         let calendar_path = format!("/calendars/{}/{}/", self.config.username, calendar_id);
-        let full_url = format!("{}{}", self.config.server_url.trim_end_matches('/'), calendar_path);
+        let full_url = format!(
+            "{}{}",
+            self.config.server_url.trim_end_matches('/'),
+            calendar_path
+        );
 
         // Build color property if provided
         let color_property = if let Some(color) = color {
-            format!(r#"<ic:calendar-color xmlns:ic="http://apple.com/ns/ical/">{}</ic:calendar-color>"#, color)
+            format!(
+                r#"<ic:calendar-color xmlns:ic="http://apple.com/ns/ical/">{}</ic:calendar-color>"#,
+                color
+            )
         } else {
             String::new()
         };
 
         let description_property = if let Some(desc) = description {
-            format!(r#"<c:calendar-description xmlns:c="urn:ietf:params:xml:ns:caldav">{}</c:calendar-description>"#, desc)
+            format!(
+                r#"<c:calendar-description xmlns:c="urn:ietf:params:xml:ns:caldav">{}</c:calendar-description>"#,
+                desc
+            )
         } else {
             String::new()
         };
@@ -688,10 +788,17 @@ impl CalDAVClient {
         println!("Creating calendar at: {}", full_url);
         println!("MKCALENDAR body: {}", mkcalendar_body);
 
-        let response = self.http_client
+        let response = self
-            .request(reqwest::Method::from_bytes(b"MKCALENDAR").unwrap(), &full_url)
+            .http_client
+            .request(
+                reqwest::Method::from_bytes(b"MKCALENDAR").unwrap(),
+                &full_url,
+            )
             .header("Content-Type", "application/xml; charset=utf-8")
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .body(mkcalendar_body)
             .send()
             .await
@@ -721,14 +828,22 @@ impl CalDAVClient {
             } else {
                 calendar_path
             };
-            format!("{}{}", self.config.server_url.trim_end_matches('/'), clean_path)
+            format!(
+                "{}{}",
+                self.config.server_url.trim_end_matches('/'),
+                clean_path
+            )
         };
 
         println!("Deleting calendar at: {}", full_url);
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .delete(&full_url)
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .send()
             .await
             .map_err(|e| CalDAVError::ParseError(e.to_string()))?;
@@ -747,7 +862,11 @@ impl CalDAVClient {
     }
 
     /// Create a new event in a CalDAV calendar
-    pub async fn create_event(&self, calendar_path: &str, event: &CalendarEvent) -> Result<String, CalDAVError> {
+    pub async fn create_event(
+        &self,
+        calendar_path: &str,
+        event: &CalendarEvent,
+    ) -> Result<String, CalDAVError> {
         // Generate a unique filename for the event (using UID + .ics extension)
         let event_filename = format!("{}.ics", event.uid);
 
@@ -790,9 +909,13 @@ impl CalDAVClient {
         let _lock = CALDAV_HTTP_MUTEX.lock().await;
         println!("📡 Lock acquired, sending CREATE request to CalDAV server...");
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .put(&full_url)
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .header("Content-Type", "text/calendar; charset=utf-8")
             .header("User-Agent", "calendar-app/0.1.0")
             .body(ical_data)
@@ -814,13 +937,22 @@ impl CalDAVClient {
     }
 
     /// Update an existing event on the CalDAV server
-    pub async fn update_event(&self, calendar_path: &str, event: &CalendarEvent, event_href: &str) -> Result<(), CalDAVError> {
+    pub async fn update_event(
+        &self,
+        calendar_path: &str,
+        event: &CalendarEvent,
+        event_href: &str,
+    ) -> Result<(), CalDAVError> {
         // Construct the full URL for the event
         let full_url = if event_href.starts_with("http") {
             event_href.to_string()
         } else if event_href.starts_with("/dav.php") {
             // Event href is already a full path, combine with base server URL (without /dav.php)
-            let base_url = self.config.server_url.trim_end_matches('/').trim_end_matches("/dav.php");
+            let base_url = self
+                .config
+                .server_url
+                .trim_end_matches('/')
+                .trim_end_matches("/dav.php");
             format!("{}{}", base_url, event_href)
         } else {
             // Event href is just a filename, combine with calendar path
@@ -829,7 +961,12 @@ impl CalDAVClient {
             } else {
                 calendar_path
             };
-            format!("{}/dav.php{}/{}", self.config.server_url.trim_end_matches('/'), clean_path, event_href)
+            format!(
+                "{}/dav.php{}/{}",
+                self.config.server_url.trim_end_matches('/'),
+                clean_path,
+                event_href
+            )
         };
 
         println!("📝 Updating event at: {}", full_url);
@@ -846,9 +983,13 @@ impl CalDAVClient {
         println!("🔗 PUT URL: {}", full_url);
         println!("🔍 Request headers: Authorization: Basic [HIDDEN], Content-Type: text/calendar; charset=utf-8");
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .put(&full_url)
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .header("Content-Type", "text/calendar; charset=utf-8")
             .header("User-Agent", "calendar-app/0.1.0")
             .timeout(std::time::Duration::from_secs(30))
@@ -862,7 +1003,10 @@ impl CalDAVClient {
 
         println!("Event update response status: {}", response.status());
 
-        if response.status().is_success() || response.status().as_u16() == 201 || response.status().as_u16() == 204 {
+        if response.status().is_success()
+            || response.status().as_u16() == 201
+            || response.status().as_u16() == 204
+        {
             println!("✅ Event updated successfully");
             Ok(())
         } else {
@@ -878,13 +1022,10 @@ impl CalDAVClient {
         let now = chrono::Utc::now();
 
         // Format datetime for iCal (YYYYMMDDTHHMMSSZ format)
-        let format_datetime = |dt: &DateTime<Utc>| -> String {
+        let format_datetime =
-            dt.format("%Y%m%dT%H%M%SZ").to_string()
+            |dt: &DateTime<Utc>| -> String { dt.format("%Y%m%dT%H%M%SZ").to_string() };
-        };
 
-        let format_date = |dt: &DateTime<Utc>| -> String {
+        let format_date = |dt: &DateTime<Utc>| -> String { dt.format("%Y%m%d").to_string() };
-            dt.format("%Y%m%d").to_string()
-        };
 
         // Start building the iCal event
         let mut ical = String::new();
@@ -899,7 +1040,10 @@ impl CalDAVClient {
 
         // Start and end times
         if event.all_day {
-            ical.push_str(&format!("DTSTART;VALUE=DATE:{}\r\n", format_date(&event.dtstart)));
+            ical.push_str(&format!(
+                "DTSTART;VALUE=DATE:{}\r\n",
+                format_date(&event.dtstart)
+            ));
             if let Some(end) = &event.dtend {
                 ical.push_str(&format!("DTEND;VALUE=DATE:{}\r\n", format_date(end)));
             }
@@ -916,7 +1060,10 @@ impl CalDAVClient {
         }
 
         if let Some(description) = &event.description {
-            ical.push_str(&format!("DESCRIPTION:{}\r\n", self.escape_ical_text(description)));
+            ical.push_str(&format!(
+                "DESCRIPTION:{}\r\n",
+                self.escape_ical_text(description)
+            ));
         }
 
         if let Some(location) = &event.location {
@@ -951,7 +1098,10 @@ impl CalDAVClient {
         // Categories
         if !event.categories.is_empty() {
             let categories = event.categories.join(",");
-            ical.push_str(&format!("CATEGORIES:{}\r\n", self.escape_ical_text(&categories)));
+            ical.push_str(&format!(
+                "CATEGORIES:{}\r\n",
+                self.escape_ical_text(&categories)
+            ));
         }
 
         // Creation and modification times
@@ -989,9 +1139,15 @@ impl CalDAVClient {
             }
 
             if let Some(description) = &alarm.description {
-                ical.push_str(&format!("DESCRIPTION:{}\r\n", self.escape_ical_text(description)));
+                ical.push_str(&format!(
+                    "DESCRIPTION:{}\r\n",
+                    self.escape_ical_text(description)
+                ));
             } else if let Some(summary) = &event.summary {
-                ical.push_str(&format!("DESCRIPTION:{}\r\n", self.escape_ical_text(summary)));
+                ical.push_str(&format!(
+                    "DESCRIPTION:{}\r\n",
+                    self.escape_ical_text(summary)
+                ));
             }
 
             ical.push_str("END:VALARM\r\n");
@@ -1005,7 +1161,10 @@ impl CalDAVClient {
         // Exception dates (EXDATE)
         for exception_date in &event.exdate {
             if event.all_day {
-                ical.push_str(&format!("EXDATE;VALUE=DATE:{}\r\n", format_date(exception_date)));
+                ical.push_str(&format!(
+                    "EXDATE;VALUE=DATE:{}\r\n",
+                    format_date(exception_date)
+                ));
             } else {
                 ical.push_str(&format!("EXDATE:{}\r\n", format_datetime(exception_date)));
             }
@@ -1027,13 +1186,21 @@ impl CalDAVClient {
     }
 
     /// Delete an event from a CalDAV calendar
-    pub async fn delete_event(&self, calendar_path: &str, event_href: &str) -> Result<(), CalDAVError> {
+    pub async fn delete_event(
+        &self,
+        calendar_path: &str,
+        event_href: &str,
+    ) -> Result<(), CalDAVError> {
         // Construct the full URL for the event
         let full_url = if event_href.starts_with("http") {
             event_href.to_string()
         } else if event_href.starts_with("/dav.php") {
             // Event href is already a full path, combine with base server URL (without /dav.php)
-            let base_url = self.config.server_url.trim_end_matches('/').trim_end_matches("/dav.php");
+            let base_url = self
+                .config
+                .server_url
+                .trim_end_matches('/')
+                .trim_end_matches("/dav.php");
             format!("{}{}", base_url, event_href)
         } else {
             // Event href is just a filename, combine with calendar path
@@ -1042,7 +1209,12 @@ impl CalDAVClient {
             } else {
                 calendar_path
             };
-            format!("{}/dav.php{}/{}", self.config.server_url.trim_end_matches('/'), clean_path, event_href)
+            format!(
+                "{}/dav.php{}/{}",
+                self.config.server_url.trim_end_matches('/'),
+                clean_path,
+                event_href
+            )
         };
 
         println!("Deleting event at: {}", full_url);
@@ -1051,9 +1223,13 @@ impl CalDAVClient {
         let _lock = CALDAV_HTTP_MUTEX.lock().await;
         println!("📡 Lock acquired, sending DELETE request to CalDAV server...");
 
-        let response = self.http_client
+        let response = self
+            .http_client
             .delete(&full_url)
-            .header("Authorization", format!("Basic {}", self.config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", self.config.get_basic_auth()),
+            )
             .send()
             .await
             .map_err(|e| CalDAVError::ParseError(e.to_string()))?;
@@ -1103,8 +1279,11 @@ mod tests {
     /// This test requires a valid .env file and a calendar with some events
     #[tokio::test]
     async fn test_fetch_calendar_events() {
-        let config = CalDAVConfig::from_env()
+        let config = CalDAVConfig::new(
-            .expect("Failed to load CalDAV config from environment");
+            "https://example.com".to_string(),
+            "test_user".to_string(),
+            "test_password".to_string(),
+        );
 
         let client = CalDAVClient::new(config);
 
@@ -1147,7 +1326,10 @@ mod tests {
                         for event in &events {
                             assert!(!event.uid.is_empty(), "Event UID should not be empty");
                             // All events should have a start time
-                            assert!(event.dtstart > DateTime::from_timestamp(0, 0).unwrap(), "Event should have valid start time");
+                            assert!(
+                                event.dtstart > DateTime::from_timestamp(0, 0).unwrap(),
+                                "Event should have valid start time"
+                            );
                         }
 
                         println!("\n✓ Calendar event fetching test passed!");
@@ -1192,11 +1374,11 @@ END:VCALENDAR"#;
             username: "test".to_string(),
             password: "test".to_string(),
             calendar_path: None,
-            tasks_path: None,
         };
 
         let client = CalDAVClient::new(config);
-        let events = client.parse_ical_data(sample_ical)
+        let events = client
+            .parse_ical_data(sample_ical)
             .expect("Should be able to parse sample iCal data");
 
         assert_eq!(events.len(), 1);
@@ -1223,23 +1405,25 @@ END:VCALENDAR"#;
             username: "test".to_string(),
             password: "test".to_string(),
             calendar_path: None,
-            tasks_path: None,
         };
 
         let client = CalDAVClient::new(config);
 
         // Test UTC format
-        let dt1 = client.parse_datetime("20231225T120000Z", None)
+        let dt1 = client
+            .parse_datetime("20231225T120000Z", None)
             .expect("Should parse UTC datetime");
         println!("Parsed UTC datetime: {}", dt1);
 
         // Test date-only format (should be treated as all-day)
-        let dt2 = client.parse_datetime("20231225", None)
+        let dt2 = client
+            .parse_datetime("20231225", None)
             .expect("Should parse date-only");
         println!("Parsed date-only: {}", dt2);
 
         // Test local format
-        let dt3 = client.parse_datetime("20231225T120000", None)
+        let dt3 = client
+            .parse_datetime("20231225T120000", None)
             .expect("Should parse local datetime");
         println!("Parsed local datetime: {}", dt3);
 
@@ -1259,5 +1443,4 @@ END:VCALENDAR"#;
 
         println!("✓ Event enum tests passed!");
     }
-
 }

backend/src/config.rs

@@ -1,6 +1,6 @@
+use base64::prelude::*;
 use serde::{Deserialize, Serialize};
 use std::env;
-use base64::prelude::*;
 
 /// Configuration for CalDAV server connection and authentication.
 ///
@@ -17,14 +17,16 @@ use base64::prelude::*;
 ///
 /// ```rust
 /// # use calendar_backend::config::CalDAVConfig;
-/// # fn example() -> Result<(), Box<dyn std::error::Error>> {
+/// let config = CalDAVConfig {
-/// // Load configuration from environment variables
+///     server_url: "https://caldav.example.com".to_string(),
-/// let config = CalDAVConfig::from_env()?;
+///     username: "user@example.com".to_string(),
+///     password: "password".to_string(),
+///     calendar_path: None,
+///     tasks_path: None,
+/// };
 ///
 /// // Use the configuration for HTTP requests
 /// let auth_header = format!("Basic {}", config.get_basic_auth());
-/// # Ok(())
-/// # }
 /// ```
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct CalDAVConfig {
@@ -41,74 +43,37 @@ pub struct CalDAVConfig {
 
     /// Optional path to the calendar collection on the server
     ///
-    /// If not provided, the client will need to discover available calendars
+    /// If not provided, the client will discover available calendars
     /// through CalDAV PROPFIND requests
     pub calendar_path: Option<String>,
-    
-    /// Optional path to the tasks/todo collection on the server
-    /// 
-    /// Some CalDAV servers store tasks separately from calendar events
-    pub tasks_path: Option<String>,
 }
 
 impl CalDAVConfig {
-    /// Creates a new CalDAVConfig by loading values from environment variables.
+    /// Creates a new CalDAVConfig with the given credentials.
     ///
-    /// This method will attempt to load a `.env` file from the current directory
+    /// # Arguments
-    /// and then read the following required environment variables:
     ///
-    /// - `CALDAV_SERVER_URL`: The CalDAV server base URL
+    /// * `server_url` - The base URL of the CalDAV server
-    /// - `CALDAV_USERNAME`: Username for authentication
+    /// * `username` - Username for authentication
-    /// - `CALDAV_PASSWORD`: Password for authentication
+    /// * `password` - Password for authentication
-    /// 
-    /// Optional environment variables:
-    /// 
-    /// - `CALDAV_CALENDAR_PATH`: Path to calendar collection
-    /// - `CALDAV_TASKS_PATH`: Path to tasks collection
-    /// 
-    /// # Errors
-    /// 
-    /// Returns `ConfigError::MissingVar` if any required environment variable
-    /// is not set or cannot be read.
     ///
     /// # Example
     ///
     /// ```rust
     /// # use calendar_backend::config::CalDAVConfig;
-    /// 
+    /// let config = CalDAVConfig::new(
-    /// match CalDAVConfig::from_env() {
+    ///     "https://caldav.example.com".to_string(),
-    ///     Ok(config) => {
+    ///     "user@example.com".to_string(),
-    ///         println!("Loaded config for server: {}", config.server_url);
+    ///     "password".to_string()
-    ///     }
+    /// );
-    ///     Err(e) => {
-    ///         eprintln!("Failed to load config: {}", e);
-    ///     }
-    /// }
     /// ```
-    pub fn from_env() -> Result<Self, ConfigError> {
+    pub fn new(server_url: String, username: String, password: String) -> Self {
-        // Attempt to load .env file, but don't fail if it doesn't exist
+        Self {
-        dotenvy::dotenv().ok();
-
-        let server_url = env::var("CALDAV_SERVER_URL")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_SERVER_URL".to_string()))?;
-
-        let username = env::var("CALDAV_USERNAME")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_USERNAME".to_string()))?;
-
-        let password = env::var("CALDAV_PASSWORD")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_PASSWORD".to_string()))?;
-
-        // Optional paths - it's fine if these are not set
-        let calendar_path = env::var("CALDAV_CALENDAR_PATH").ok();
-        let tasks_path = env::var("CALDAV_TASKS_PATH").ok();
-
-        Ok(CalDAVConfig {
             server_url,
             username,
             password,
-            calendar_path,
+            calendar_path: env::var("CALDAV_CALENDAR_PATH").ok(), // Optional override from env
-            tasks_path,
+        }
-        })
     }
 
     /// Generates a Base64-encoded string for HTTP Basic Authentication.
@@ -174,7 +139,6 @@ mod tests {
             username: "testuser".to_string(),
             password: "testpass".to_string(),
             calendar_path: None,
-            tasks_path: None,
         };
 
         let auth = config.get_basic_auth();
@@ -192,9 +156,12 @@ mod tests {
     /// Run with: `cargo test test_baikal_auth`
     #[tokio::test]
     async fn test_baikal_auth() {
-        // Load config from .env
+        // Use test config - update these values to test with real server
-        let config = CalDAVConfig::from_env()
+        let config = CalDAVConfig::new(
-            .expect("Failed to load CalDAV config from environment");
+            "https://example.com".to_string(),
+            "test_user".to_string(),
+            "test_password".to_string(),
+        );
 
         println!("Testing authentication to: {}", config.server_url);
 
@@ -204,7 +171,10 @@ mod tests {
         // Make a simple OPTIONS request to test authentication
         let response = client
             .request(reqwest::Method::OPTIONS, &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", config.get_basic_auth()),
+            )
             .header("User-Agent", "calendar-app/0.1.0")
             .send()
             .await
@@ -222,9 +192,9 @@ mod tests {
 
         // For Baikal/CalDAV servers, we should see DAV headers
         assert!(
-            response.headers().contains_key("dav") || 
+            response.headers().contains_key("dav")
-            response.headers().contains_key("DAV") ||
+                || response.headers().contains_key("DAV")
-            response.status().is_success(),
+                || response.status().is_success(),
             "Server doesn't appear to be a CalDAV server - missing DAV headers"
         );
 
@@ -238,8 +208,12 @@ mod tests {
     /// Run with: `cargo test test_propfind_calendars`
     #[tokio::test]
     async fn test_propfind_calendars() {
-        let config = CalDAVConfig::from_env()
+        // Use test config - update these values to test with real server
-            .expect("Failed to load CalDAV config from environment");
+        let config = CalDAVConfig::new(
+            "https://example.com".to_string(),
+            "test_user".to_string(),
+            "test_password".to_string(),
+        );
 
         let client = reqwest::Client::new();
 
@@ -255,8 +229,14 @@ mod tests {
 </d:propfind>"#;
 
         let response = client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &config.server_url)
+            .request(
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
+                reqwest::Method::from_bytes(b"PROPFIND").unwrap(),
+                &config.server_url,
+            )
+            .header(
+                "Authorization",
+                format!("Basic {}", config.get_basic_auth()),
+            )
             .header("Content-Type", "application/xml")
             .header("Depth", "1")
             .header("User-Agent", "calendar-app/0.1.0")
@@ -279,7 +259,10 @@ mod tests {
         );
 
         // The response should contain XML with calendar information
-        assert!(body.contains("calendar"), "Response should contain calendar information");
+        assert!(
+            body.contains("calendar"),
+            "Response should contain calendar information"
+        );
 
         println!("✓ PROPFIND calendars test passed!");
     }

backend/src/db.rs

@@ -0,0 +1,305 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use sqlx::sqlite::{SqlitePool, SqlitePoolOptions};
+use sqlx::{FromRow, Result};
+use std::sync::Arc;
+use uuid::Uuid;
+
+/// Database connection pool wrapper
+#[derive(Clone)]
+pub struct Database {
+    pool: Arc<SqlitePool>,
+}
+
+impl Database {
+    /// Create a new database connection pool
+    pub async fn new(database_url: &str) -> Result<Self> {
+        let pool = SqlitePoolOptions::new()
+            .max_connections(5)
+            .connect(database_url)
+            .await?;
+
+        // Run migrations
+        sqlx::migrate!("./migrations").run(&pool).await?;
+
+        Ok(Self {
+            pool: Arc::new(pool),
+        })
+    }
+
+    /// Get a reference to the connection pool
+    pub fn pool(&self) -> &SqlitePool {
+        &self.pool
+    }
+}
+
+/// User model representing a CalDAV user
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct User {
+    pub id: String, // UUID as string for SQLite
+    pub username: String,
+    pub server_url: String,
+    pub created_at: DateTime<Utc>,
+}
+
+impl User {
+    /// Create a new user with generated UUID
+    pub fn new(username: String, server_url: String) -> Self {
+        Self {
+            id: Uuid::new_v4().to_string(),
+            username,
+            server_url,
+            created_at: Utc::now(),
+        }
+    }
+}
+
+/// Session model for user sessions
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct Session {
+    pub id: String,      // UUID as string
+    pub user_id: String, // Foreign key to User
+    pub token: String,   // Session token
+    pub created_at: DateTime<Utc>,
+    pub expires_at: DateTime<Utc>,
+    pub last_accessed: DateTime<Utc>,
+}
+
+impl Session {
+    /// Create a new session for a user
+    pub fn new(user_id: String, token: String, expires_in_hours: i64) -> Self {
+        let now = Utc::now();
+        Self {
+            id: Uuid::new_v4().to_string(),
+            user_id,
+            token,
+            created_at: now,
+            expires_at: now + chrono::Duration::hours(expires_in_hours),
+            last_accessed: now,
+        }
+    }
+
+    /// Check if the session has expired
+    pub fn is_expired(&self) -> bool {
+        Utc::now() > self.expires_at
+    }
+}
+
+/// User preferences model
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct UserPreferences {
+    pub user_id: String,
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>, // JSON string
+    pub updated_at: DateTime<Utc>,
+}
+
+impl UserPreferences {
+    /// Create default preferences for a new user
+    pub fn default_for_user(user_id: String) -> Self {
+        Self {
+            user_id,
+            calendar_selected_date: None,
+            calendar_time_increment: Some(15),
+            calendar_view_mode: Some("month".to_string()),
+            calendar_theme: Some("light".to_string()),
+            calendar_colors: None,
+            updated_at: Utc::now(),
+        }
+    }
+}
+
+/// Repository for User operations
+pub struct UserRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> UserRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Find or create a user by username and server URL
+    pub async fn find_or_create(
+        &self,
+        username: &str,
+        server_url: &str,
+    ) -> Result<User> {
+        // Try to find existing user
+        let existing = sqlx::query_as::<_, User>(
+            "SELECT * FROM users WHERE username = ? AND server_url = ?",
+        )
+        .bind(username)
+        .bind(server_url)
+        .fetch_optional(self.db.pool())
+        .await?;
+
+        if let Some(user) = existing {
+            Ok(user)
+        } else {
+            // Create new user
+            let user = User::new(username.to_string(), server_url.to_string());
+            
+            sqlx::query(
+                "INSERT INTO users (id, username, server_url, created_at) VALUES (?, ?, ?, ?)",
+            )
+            .bind(&user.id)
+            .bind(&user.username)
+            .bind(&user.server_url)
+            .bind(&user.created_at)
+            .execute(self.db.pool())
+            .await?;
+
+            Ok(user)
+        }
+    }
+
+    /// Find a user by ID
+    pub async fn find_by_id(&self, user_id: &str) -> Result<Option<User>> {
+        sqlx::query_as::<_, User>("SELECT * FROM users WHERE id = ?")
+            .bind(user_id)
+            .fetch_optional(self.db.pool())
+            .await
+    }
+}
+
+/// Repository for Session operations
+pub struct SessionRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> SessionRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Create a new session
+    pub async fn create(&self, session: &Session) -> Result<()> {
+        sqlx::query(
+            "INSERT INTO sessions (id, user_id, token, created_at, expires_at, last_accessed) 
+             VALUES (?, ?, ?, ?, ?, ?)",
+        )
+        .bind(&session.id)
+        .bind(&session.user_id)
+        .bind(&session.token)
+        .bind(&session.created_at)
+        .bind(&session.expires_at)
+        .bind(&session.last_accessed)
+        .execute(self.db.pool())
+        .await?;
+
+        Ok(())
+    }
+
+    /// Find a session by token and update last_accessed
+    pub async fn find_by_token(&self, token: &str) -> Result<Option<Session>> {
+        let session = sqlx::query_as::<_, Session>("SELECT * FROM sessions WHERE token = ?")
+            .bind(token)
+            .fetch_optional(self.db.pool())
+            .await?;
+
+        if let Some(ref s) = session {
+            if !s.is_expired() {
+                // Update last_accessed time
+                sqlx::query("UPDATE sessions SET last_accessed = ? WHERE id = ?")
+                    .bind(Utc::now())
+                    .bind(&s.id)
+                    .execute(self.db.pool())
+                    .await?;
+            }
+        }
+
+        Ok(session)
+    }
+
+    /// Delete a session (logout)
+    pub async fn delete(&self, token: &str) -> Result<()> {
+        sqlx::query("DELETE FROM sessions WHERE token = ?")
+            .bind(token)
+            .execute(self.db.pool())
+            .await?;
+
+        Ok(())
+    }
+
+    /// Clean up expired sessions
+    pub async fn cleanup_expired(&self) -> Result<u64> {
+        let result = sqlx::query("DELETE FROM sessions WHERE expires_at < ?")
+            .bind(Utc::now())
+            .execute(self.db.pool())
+            .await?;
+
+        Ok(result.rows_affected())
+    }
+}
+
+/// Repository for UserPreferences operations
+pub struct PreferencesRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> PreferencesRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Get user preferences, creating defaults if not exist
+    pub async fn get_or_create(&self, user_id: &str) -> Result<UserPreferences> {
+        let existing = sqlx::query_as::<_, UserPreferences>(
+            "SELECT * FROM user_preferences WHERE user_id = ?",
+        )
+        .bind(user_id)
+        .fetch_optional(self.db.pool())
+        .await?;
+
+        if let Some(prefs) = existing {
+            Ok(prefs)
+        } else {
+            // Create default preferences
+            let prefs = UserPreferences::default_for_user(user_id.to_string());
+            
+            sqlx::query(
+                "INSERT INTO user_preferences 
+                 (user_id, calendar_selected_date, calendar_time_increment, 
+                  calendar_view_mode, calendar_theme, calendar_colors, updated_at) 
+                 VALUES (?, ?, ?, ?, ?, ?, ?)",
+            )
+            .bind(&prefs.user_id)
+            .bind(&prefs.calendar_selected_date)
+            .bind(&prefs.calendar_time_increment)
+            .bind(&prefs.calendar_view_mode)
+            .bind(&prefs.calendar_theme)
+            .bind(&prefs.calendar_colors)
+            .bind(&prefs.updated_at)
+            .execute(self.db.pool())
+            .await?;
+
+            Ok(prefs)
+        }
+    }
+
+    /// Update user preferences
+    pub async fn update(&self, prefs: &UserPreferences) -> Result<()> {
+        sqlx::query(
+            "UPDATE user_preferences 
+             SET calendar_selected_date = ?, calendar_time_increment = ?, 
+                 calendar_view_mode = ?, calendar_theme = ?, 
+                 calendar_colors = ?, updated_at = ?
+             WHERE user_id = ?",
+        )
+        .bind(&prefs.calendar_selected_date)
+        .bind(&prefs.calendar_time_increment)
+        .bind(&prefs.calendar_view_mode)
+        .bind(&prefs.calendar_theme)
+        .bind(&prefs.calendar_colors)
+        .bind(Utc::now())
+        .bind(&prefs.user_id)
+        .execute(self.db.pool())
+        .await?;
+
+        Ok(())
+    }
+}

backend/src/debug_caldav.rs

@@ -2,7 +2,12 @@ use crate::calendar::CalDAVClient;
 use crate::config::CalDAVConfig;
 
 pub async fn debug_caldav_fetch() -> Result<(), Box<dyn std::error::Error>> {
-    let config = CalDAVConfig::from_env()?;
+    // Use debug/test configuration
+    let config = CalDAVConfig::new(
+        "https://example.com".to_string(),
+        "debug_user".to_string(),
+        "debug_password".to_string()
+    );
     let client = CalDAVClient::new(config);
     
     println!("=== DEBUG: CalDAV Fetch ===");

backend/src/handlers.rs

@@ -2,9 +2,11 @@
 mod auth;
 mod calendar;
 mod events;
+mod preferences;
 mod series;
 
-pub use auth::{login, verify_token, get_user_info};
+pub use auth::{get_user_info, login, verify_token};
 pub use calendar::{create_calendar, delete_calendar};
-pub use events::{get_calendar_events, refresh_event, create_event, update_event, delete_event};
+pub use events::{create_event, delete_event, get_calendar_events, refresh_event, update_event};
-pub use series::{create_event_series, update_event_series, delete_event_series};
+pub use preferences::{get_preferences, logout, update_preferences};
+pub use series::{create_event_series, delete_event_series, update_event_series};

backend/src/handlers/auth.rs

@@ -1,33 +1,38 @@
-use axum::{
+use axum::{extract::State, http::HeaderMap, response::Json};
-    extract::State,
-    http::HeaderMap,
-    response::Json,
-};
 use std::sync::Arc;
 
-use crate::{AppState, models::{CalDAVLoginRequest, AuthResponse, ApiError, UserInfo, CalendarInfo}};
 use crate::calendar::CalDAVClient;
 use crate::config::CalDAVConfig;
+use crate::{
+    models::{ApiError, AuthResponse, CalDAVLoginRequest, CalendarInfo, UserInfo},
+    AppState,
+};
 
 pub fn extract_bearer_token(headers: &HeaderMap) -> Result<String, ApiError> {
-    let auth_header = headers.get("authorization")
+    let auth_header = headers
+        .get("authorization")
         .ok_or_else(|| ApiError::Unauthorized("Missing Authorization header".to_string()))?;
 
-    let auth_str = auth_header.to_str()
+    let auth_str = auth_header
+        .to_str()
         .map_err(|_| ApiError::BadRequest("Invalid Authorization header".to_string()))?;
 
     if let Some(token) = auth_str.strip_prefix("Bearer ") {
         Ok(token.to_string())
     } else {
-        Err(ApiError::BadRequest("Authorization header must be Bearer token".to_string()))
+        Err(ApiError::BadRequest(
+            "Authorization header must be Bearer token".to_string(),
+        ))
     }
 }
 
 pub fn extract_password_header(headers: &HeaderMap) -> Result<String, ApiError> {
-    let password_header = headers.get("x-caldav-password")
+    let password_header = headers
+        .get("x-caldav-password")
         .ok_or_else(|| ApiError::BadRequest("Missing X-CalDAV-Password header".to_string()))?;
 
-    password_header.to_str()
+    password_header
+        .to_str()
         .map(|s| s.to_string())
         .map_err(|_| ApiError::BadRequest("Invalid X-CalDAV-Password header".to_string()))
 }
@@ -41,38 +46,12 @@ pub async fn login(
     println!("  Username: {}", request.username);
     println!("  Password length: {}", request.password.len());
 
-    // Basic validation
+    // Use the auth service login method which now handles database, sessions, and preferences
-    if request.username.is_empty() || request.password.is_empty() || request.server_url.is_empty() {
+    let response = state.auth_service.login(request).await?;
-        return Err(ApiError::BadRequest("Username, password, and server URL are required".to_string()));
-    }
 
-    println!("✅ Input validation passed");
+    println!("✅ Login successful with session management");
 
-    // Create a token using the auth service
+    Ok(Json(response))
-    println!("📝 Created CalDAV config");
-    
-    // First verify the credentials are valid by attempting to discover calendars
-    let config = CalDAVConfig {
-        server_url: request.server_url.clone(),
-        username: request.username.clone(),
-        password: request.password.clone(),
-        calendar_path: None,
-        tasks_path: None,
-    };
-    let client = CalDAVClient::new(config);
-    client.discover_calendars()
-        .await
-        .map_err(|e| ApiError::Unauthorized(format!("Authentication failed: {}", e)))?;
-    
-    let token = state.auth_service.generate_token(&request.username, &request.server_url)?;
-    
-    println!("🔗 Created CalDAV client, attempting to discover calendars...");
-    
-    Ok(Json(AuthResponse {
-        token,
-        username: request.username,
-        server_url: request.server_url,
-    }))
 }
 
 pub async fn verify_token(
@@ -93,23 +72,30 @@ pub async fn get_user_info(
     let password = extract_password_header(&headers)?;
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config.clone());
 
     // Discover calendars
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
-    println!("✅ Authentication successful! Found {} calendars", calendar_paths.len());
+    println!(
+        "✅ Authentication successful! Found {} calendars",
+        calendar_paths.len()
+    );
 
-    let calendars: Vec<CalendarInfo> = calendar_paths.iter().map(|path| {
+    let calendars: Vec<CalendarInfo> = calendar_paths
-        CalendarInfo {
+        .iter()
+        .map(|path| CalendarInfo {
             path: path.clone(),
             display_name: extract_calendar_name(path),
             color: generate_calendar_color(path),
-        }
+        })
-    }).collect();
+        .collect();
 
     Ok(Json(UserInfo {
         username: config.username,
@@ -128,10 +114,9 @@ fn generate_calendar_color(path: &str) -> String {
 
     // Define a set of pleasant colors
     let colors = [
-        "#3B82F6", "#10B981", "#F59E0B", "#EF4444", "#8B5CF6",
+        "#3B82F6", "#10B981", "#F59E0B", "#EF4444", "#8B5CF6", "#06B6D4", "#84CC16", "#F97316",
-        "#06B6D4", "#84CC16", "#F97316", "#EC4899", "#6366F1",
+        "#EC4899", "#6366F1", "#14B8A6", "#F3B806", "#8B5A2B", "#6B7280", "#DC2626", "#7C3AED",
-        "#14B8A6", "#F3B806", "#8B5A2B", "#6B7280", "#DC2626",
+        "#059669", "#D97706", "#BE185D", "#4F46E5",
-        "#7C3AED", "#059669", "#D97706", "#BE185D", "#4F46E5"
     ];
 
     colors[(hash as usize) % colors.len()].to_string()

backend/src/handlers/calendar.rs

@@ -1,12 +1,14 @@
-use axum::{
+use axum::{extract::State, http::HeaderMap, response::Json};
-    extract::State,
-    http::HeaderMap,
-    response::Json,
-};
 use std::sync::Arc;
 
-use crate::{AppState, models::{ApiError, CreateCalendarRequest, CreateCalendarResponse, DeleteCalendarRequest, DeleteCalendarResponse}};
 use crate::calendar::CalDAVClient;
+use crate::{
+    models::{
+        ApiError, CreateCalendarRequest, CreateCalendarResponse, DeleteCalendarRequest,
+        DeleteCalendarResponse,
+    },
+    AppState,
+};
 
 use super::auth::{extract_bearer_token, extract_password_header};
 
@@ -20,22 +22,36 @@ pub async fn create_calendar(
 
     // Validate request
     if request.name.trim().is_empty() {
-        return Err(ApiError::BadRequest("Calendar name is required".to_string()));
+        return Err(ApiError::BadRequest(
+            "Calendar name is required".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Create calendar on CalDAV server
-    match client.create_calendar(&request.name, request.description.as_deref(), request.color.as_deref()).await {
+    match client
+        .create_calendar(
+            &request.name,
+            request.description.as_deref(),
+            request.color.as_deref(),
+        )
+        .await
+    {
         Ok(_) => Ok(Json(CreateCalendarResponse {
             success: true,
             message: "Calendar created successfully".to_string(),
         })),
         Err(e) => {
             eprintln!("Failed to create calendar: {}", e);
-            Err(ApiError::Internal(format!("Failed to create calendar: {}", e)))
+            Err(ApiError::Internal(format!(
+                "Failed to create calendar: {}",
+                e
+            )))
         }
     }
 }
@@ -50,11 +66,15 @@ pub async fn delete_calendar(
 
     // Validate request
     if request.path.trim().is_empty() {
-        return Err(ApiError::BadRequest("Calendar path is required".to_string()));
+        return Err(ApiError::BadRequest(
+            "Calendar path is required".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Delete calendar on CalDAV server
@@ -65,7 +85,10 @@ pub async fn delete_calendar(
         })),
         Err(e) => {
             eprintln!("Failed to delete calendar: {}", e);
-            Err(ApiError::Internal(format!("Failed to delete calendar: {}", e)))
+            Err(ApiError::Internal(format!(
+                "Failed to delete calendar: {}",
+                e
+            )))
         }
     }
 }

backend/src/handlers/events.rs

@@ -1,15 +1,23 @@
 use axum::{
-    extract::{State, Query, Path},
+    extract::{Path, Query, State},
     http::HeaderMap,
     response::Json,
 };
+use chrono::Datelike;
 use serde::Deserialize;
 use std::sync::Arc;
-use chrono::Datelike;
 
-use calendar_models::{VEvent, EventStatus, EventClass, CalendarUser, Attendee, VAlarm, AlarmAction, AlarmTrigger};
-use crate::{AppState, models::{ApiError, DeleteEventRequest, DeleteEventResponse, CreateEventRequest, CreateEventResponse, UpdateEventRequest, UpdateEventResponse}};
 use crate::calendar::{CalDAVClient, CalendarEvent};
+use crate::{
+    models::{
+        ApiError, CreateEventRequest, CreateEventResponse, DeleteEventRequest, DeleteEventResponse,
+        UpdateEventRequest, UpdateEventResponse,
+    },
+    AppState,
+};
+use calendar_models::{
+    AlarmAction, AlarmTrigger, Attendee, CalendarUser, EventClass, EventStatus, VAlarm, VEvent,
+};
 
 use super::auth::{extract_bearer_token, extract_password_header};
 
@@ -30,11 +38,14 @@ pub async fn get_calendar_events(
     println!("🔑 API call with password length: {}", password.len());
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Discover calendars if needed
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
@@ -54,7 +65,10 @@ pub async fn get_calendar_events(
                 all_events.extend(events);
             }
             Err(e) => {
-                eprintln!("Failed to fetch events from calendar {}: {}", calendar_path, e);
+                eprintln!(
+                    "Failed to fetch events from calendar {}: {}",
+                    calendar_path, e
+                );
                 // Continue with other calendars instead of failing completely
             }
         }
@@ -82,11 +96,14 @@ pub async fn refresh_event(
     let password = extract_password_header(&headers)?;
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Discover calendars
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
@@ -101,13 +118,20 @@ pub async fn refresh_event(
     Ok(Json(None))
 }
 
-async fn fetch_event_by_href(client: &CalDAVClient, calendar_path: &str, event_href: &str) -> Result<Option<CalendarEvent>, crate::calendar::CalDAVError> {
+async fn fetch_event_by_href(
+    client: &CalDAVClient,
+    calendar_path: &str,
+    event_href: &str,
+) -> Result<Option<CalendarEvent>, crate::calendar::CalDAVError> {
     // This is a simplified implementation - in a real scenario, you'd want to fetch the specific event by href
     // For now, we'll fetch all events and find the matching one by href (inefficient but functional)
     let events = client.fetch_events(calendar_path).await?;
 
     println!("🔍 fetch_event_by_href: looking for href='{}'", event_href);
-    println!("🔍 Available events with hrefs: {:?}", events.iter().map(|e| (&e.uid, &e.href)).collect::<Vec<_>>());
+    println!(
+        "🔍 Available events with hrefs: {:?}",
+        events.iter().map(|e| (&e.uid, &e.href)).collect::<Vec<_>>()
+    );
 
     // First try to match by exact href
     for event in &events {
@@ -123,7 +147,10 @@ async fn fetch_event_by_href(client: &CalDAVClient, calendar_path: &str, event_h
     let filename = event_href.split('/').last().unwrap_or(event_href);
     let uid_from_href = filename.trim_end_matches(".ics");
 
-    println!("🔍 Fallback: trying UID match. filename='{}', uid='{}'", filename, uid_from_href);
+    println!(
+        "🔍 Fallback: trying UID match. filename='{}', uid='{}'",
+        filename, uid_from_href
+    );
 
     for event in events {
         if event.uid == uid_from_href {
@@ -146,23 +173,31 @@ pub async fn delete_event(
     let password = extract_password_header(&headers)?;
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Handle different delete actions for recurring events
     match request.delete_action.as_str() {
         "delete_this" => {
-            if let Some(event) = fetch_event_by_href(&client, &request.calendar_path, &request.event_href).await
+            if let Some(event) =
-                .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))? {
+                fetch_event_by_href(&client, &request.calendar_path, &request.event_href)
-                
+                    .await
+                    .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))?
+            {
                 // Check if this is a recurring event
                 if event.rrule.is_some() && !event.rrule.as_ref().unwrap().is_empty() {
                     // Recurring event - add EXDATE for this occurrence
                     if let Some(occurrence_date) = &request.occurrence_date {
-                        let exception_utc = if let Ok(date) = chrono::DateTime::parse_from_rfc3339(occurrence_date) {
+                        let exception_utc = if let Ok(date) =
+                            chrono::DateTime::parse_from_rfc3339(occurrence_date)
+                        {
                             // RFC3339 format (with time and timezone)
                             date.with_timezone(&chrono::Utc)
-                        } else if let Ok(naive_date) = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d") {
+                        } else if let Ok(naive_date) =
+                            chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+                        {
                             // Simple date format (YYYY-MM-DD)
                             naive_date.and_hms_opt(0, 0, 0).unwrap().and_utc()
                         } else {
@@ -172,12 +207,26 @@ pub async fn delete_event(
                         let mut updated_event = event;
                         updated_event.exdate.push(exception_utc);
 
-                        println!("🔄 Adding EXDATE {} to recurring event {}", exception_utc.format("%Y%m%dT%H%M%SZ"), updated_event.uid);
+                        println!(
+                            "🔄 Adding EXDATE {} to recurring event {}",
+                            exception_utc.format("%Y%m%dT%H%M%SZ"),
+                            updated_event.uid
+                        );
 
                         // Update the event with the new EXDATE
-                        client.update_event(&request.calendar_path, &updated_event, &request.event_href)
+                        client
+                            .update_event(
+                                &request.calendar_path,
+                                &updated_event,
+                                &request.event_href,
+                            )
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to update event with EXDATE: {}", e)))?;
+                            .map_err(|e| {
+                                ApiError::Internal(format!(
+                                    "Failed to update event with EXDATE: {}",
+                                    e
+                                ))
+                            })?;
 
                         println!("✅ Successfully updated recurring event with EXDATE");
 
@@ -192,9 +241,12 @@ pub async fn delete_event(
                     // Non-recurring event - delete the entire event
                     println!("🗑️ Deleting non-recurring event: {}", event.uid);
 
-                    client.delete_event(&request.calendar_path, &request.event_href)
+                    client
+                        .delete_event(&request.calendar_path, &request.event_href)
                         .await
-                        .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
+                        .map_err(|e| {
+                            ApiError::Internal(format!("Failed to delete event: {}", e))
+                        })?;
 
                     println!("✅ Successfully deleted non-recurring event");
 
@@ -206,51 +258,77 @@ pub async fn delete_event(
             } else {
                 Err(ApiError::NotFound("Event not found".to_string()))
             }
-        },
+        }
         "delete_following" => {
             // For "this and following" deletion, we need to:
             // 1. Fetch the recurring event
             // 2. Modify the RRULE to end before this occurrence
             // 3. Update the event
 
-            if let Some(mut event) = fetch_event_by_href(&client, &request.calendar_path, &request.event_href).await
+            if let Some(mut event) =
-                .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))? {
+                fetch_event_by_href(&client, &request.calendar_path, &request.event_href)
-                
+                    .await
+                    .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))?
+            {
                 if let Some(occurrence_date) = &request.occurrence_date {
-                    let until_date = if let Ok(date) = chrono::DateTime::parse_from_rfc3339(occurrence_date) {
+                    let until_date = if let Ok(date) =
+                        chrono::DateTime::parse_from_rfc3339(occurrence_date)
+                    {
                         // RFC3339 format (with time and timezone)
                         date.with_timezone(&chrono::Utc)
-                    } else if let Ok(naive_date) = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d") {
+                    } else if let Ok(naive_date) =
+                        chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+                    {
                         // Simple date format (YYYY-MM-DD)
                         naive_date.and_hms_opt(0, 0, 0).unwrap().and_utc()
                     } else {
-                        return Err(ApiError::BadRequest(format!("Invalid occurrence date format: {}. Expected RFC3339 or YYYY-MM-DD", occurrence_date)));
+                        return Err(ApiError::BadRequest(format!(
+                            "Invalid occurrence date format: {}. Expected RFC3339 or YYYY-MM-DD",
+                            occurrence_date
+                        )));
                     };
 
                     // Modify the RRULE to add an UNTIL clause
                     if let Some(rrule) = &event.rrule {
                         // Remove existing UNTIL if present and add new one
-                        let parts: Vec<&str> = rrule.split(';').filter(|part| {
+                        let parts: Vec<&str> = rrule
+                            .split(';')
+                            .filter(|part| {
                                 !part.starts_with("UNTIL=") && !part.starts_with("COUNT=")
-                        }).collect();
+                            })
+                            .collect();
 
-                        let new_rrule = format!("{};UNTIL={}", parts.join(";"), until_date.format("%Y%m%dT%H%M%SZ"));
+                        let new_rrule = format!(
+                            "{};UNTIL={}",
+                            parts.join(";"),
+                            until_date.format("%Y%m%dT%H%M%SZ")
+                        );
                         event.rrule = Some(new_rrule);
 
                         // Update the event with the modified RRULE
-                        client.update_event(&request.calendar_path, &event, &request.event_href)
+                        client
+                            .update_event(&request.calendar_path, &event, &request.event_href)
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to update event with modified RRULE: {}", e)))?;
+                            .map_err(|e| {
+                                ApiError::Internal(format!(
+                                    "Failed to update event with modified RRULE: {}",
+                                    e
+                                ))
+                            })?;
 
                         Ok(Json(DeleteEventResponse {
                             success: true,
-                            message: "This and following occurrences deleted successfully".to_string(),
+                            message: "This and following occurrences deleted successfully"
+                                .to_string(),
                         }))
                     } else {
                         // No RRULE, just delete the single event
-                        client.delete_event(&request.calendar_path, &request.event_href)
+                        client
+                            .delete_event(&request.calendar_path, &request.event_href)
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
+                            .map_err(|e| {
+                                ApiError::Internal(format!("Failed to delete event: {}", e))
+                            })?;
 
                         Ok(Json(DeleteEventResponse {
                             success: true,
@@ -258,15 +336,18 @@ pub async fn delete_event(
                         }))
                     }
                 } else {
-                    Err(ApiError::BadRequest("Occurrence date is required for following deletion".to_string()))
+                    Err(ApiError::BadRequest(
+                        "Occurrence date is required for following deletion".to_string(),
+                    ))
                 }
             } else {
                 Err(ApiError::NotFound("Event not found".to_string()))
             }
-        },
+        }
         "delete_series" | _ => {
             // Delete the entire event/series
-            client.delete_event(&request.calendar_path, &request.event_href)
+            client
+                .delete_event(&request.calendar_path, &request.event_href)
                 .await
                 .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
 
@@ -283,8 +364,10 @@ pub async fn create_event(
     headers: HeaderMap,
     Json(request): Json<CreateEventRequest>,
 ) -> Result<Json<CreateEventResponse>, ApiError> {
-    println!("📝 Create event request received: title='{}', all_day={}, calendar_path={:?}", 
+    println!(
-             request.title, request.all_day, request.calendar_path);
+        "📝 Create event request received: title='{}', all_day={}, calendar_path={:?}",
+        request.title, request.all_day, request.calendar_path
+    );
 
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
@@ -296,11 +379,15 @@ pub async fn create_event(
     }
 
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Determine which calendar to use
@@ -308,19 +395,23 @@ pub async fn create_event(
         path
     } else {
         // Use the first available calendar
-        let calendar_paths = client.discover_calendars()
+        let calendar_paths = client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
         if calendar_paths.is_empty() {
-            return Err(ApiError::BadRequest("No calendars available for event creation".to_string()));
+            return Err(ApiError::BadRequest(
+                "No calendars available for event creation".to_string(),
+            ));
         }
 
         calendar_paths[0].clone()
     };
 
     // Parse dates and times
-    let start_datetime = parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
+    let start_datetime =
+        parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
             .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
 
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
@@ -328,11 +419,17 @@ pub async fn create_event(
 
     // Validate that end is after start
     if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest("End date/time must be after start date/time".to_string()));
+        return Err(ApiError::BadRequest(
+            "End date/time must be after start date/time".to_string(),
+        ));
     }
 
     // Generate a unique UID for the event
-    let uid = format!("{}-{}", uuid::Uuid::new_v4(), chrono::Utc::now().timestamp());
+    let uid = format!(
+        "{}-{}",
+        uuid::Uuid::new_v4(),
+        chrono::Utc::now().timestamp()
+    );
 
     // Parse status
     let status = match request.status.to_lowercase().as_str() {
@@ -352,7 +449,8 @@ pub async fn create_event(
     let attendees: Vec<String> = if request.attendees.trim().is_empty() {
         Vec::new()
     } else {
-        request.attendees
+        request
+            .attendees
             .split(',')
             .map(|s| s.trim().to_string())
             .filter(|s| !s.is_empty())
@@ -363,7 +461,8 @@ pub async fn create_event(
     let categories: Vec<String> = if request.categories.trim().is_empty() {
         Vec::new()
     } else {
-        request.categories
+        request
+            .categories
             .split(',')
             .map(|s| s.trim().to_string())
             .filter(|s| !s.is_empty())
@@ -402,7 +501,8 @@ pub async fn create_event(
 
                 // Check if specific days are selected (recurrence_days has 7 elements: [Sun, Mon, Tue, Wed, Thu, Fri, Sat])
                 if request.recurrence_days.len() == 7 {
-                    let selected_days: Vec<&str> = request.recurrence_days
+                    let selected_days: Vec<&str> = request
+                        .recurrence_days
                         .iter()
                         .enumerate()
                         .filter_map(|(i, &selected)| {
@@ -429,7 +529,7 @@ pub async fn create_event(
                 }
 
                 Some(rrule)
-            },
+            }
             "MONTHLY" => Some("FREQ=MONTHLY".to_string()),
             "YEARLY" => Some("FREQ=YEARLY".to_string()),
             _ => None,
@@ -439,9 +539,21 @@ pub async fn create_event(
     // Create the VEvent struct (RFC 5545 compliant)
     let mut event = VEvent::new(uid, start_datetime);
     event.dtend = Some(end_datetime);
-    event.summary = if request.title.trim().is_empty() { None } else { Some(request.title.clone()) };
+    event.summary = if request.title.trim().is_empty() {
-    event.description = if request.description.trim().is_empty() { None } else { Some(request.description) };
+        None
-    event.location = if request.location.trim().is_empty() { None } else { Some(request.location) };
+    } else {
+        Some(request.title.clone())
+    };
+    event.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description)
+    };
+    event.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location)
+    };
     event.status = Some(status);
     event.class = Some(class);
     event.priority = request.priority;
@@ -456,7 +568,9 @@ pub async fn create_event(
             language: None,
         })
     };
-    event.attendees = attendees.into_iter().map(|email| Attendee {
+    event.attendees = attendees
+        .into_iter()
+        .map(|email| Attendee {
             cal_address: email,
             common_name: None,
             role: None,
@@ -469,28 +583,38 @@ pub async fn create_event(
             sent_by: None,
             dir_entry_ref: None,
             language: None,
-    }).collect();
+        })
+        .collect();
     event.categories = categories;
     event.rrule = rrule;
     event.all_day = request.all_day;
-    event.alarms = alarms.into_iter().map(|reminder| VAlarm {
+    event.alarms = alarms
+        .into_iter()
+        .map(|reminder| VAlarm {
             action: AlarmAction::Display,
-        trigger: AlarmTrigger::Duration(chrono::Duration::minutes(-reminder.minutes_before as i64)),
+            trigger: AlarmTrigger::Duration(chrono::Duration::minutes(
+                -reminder.minutes_before as i64,
+            )),
             duration: None,
             repeat: None,
             description: reminder.description,
             summary: None,
             attendees: Vec::new(),
             attach: Vec::new(),
-    }).collect();
+        })
+        .collect();
     event.calendar_path = Some(calendar_path.clone());
 
     // Create the event on the CalDAV server
-    let event_href = client.create_event(&calendar_path, &event)
+    let event_href = client
+        .create_event(&calendar_path, &event)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to create event: {}", e)))?;
 
-    println!("✅ Event created successfully with UID: {} at href: {}", event.uid, event_href);
+    println!(
+        "✅ Event created successfully with UID: {} at href: {}",
+        event.uid, event_href
+    );
 
     Ok(Json(CreateEventResponse {
         success: true,
@@ -520,18 +644,23 @@ pub async fn update_event(
     }
 
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Find the event across all calendars (or in the specified calendar)
     let calendar_paths = if let Some(path) = &request.calendar_path {
         vec![path.clone()]
     } else {
-        client.discover_calendars()
+        client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?
     };
@@ -544,7 +673,10 @@ pub async fn update_event(
                 for event in events {
                     if event.uid == request.uid {
                         // Use the actual href from the event, or generate one if missing
-                        let event_href = event.href.clone().unwrap_or_else(|| format!("{}.ics", event.uid));
+                        let event_href = event
+                            .href
+                            .clone()
+                            .unwrap_or_else(|| format!("{}.ics", event.uid));
                         println!("🔍 Found event {} with href: {}", event.uid, event_href);
                         found_event = Some((event, calendar_path.clone(), event_href));
                         break;
@@ -553,9 +685,12 @@ pub async fn update_event(
                 if found_event.is_some() {
                     break;
                 }
-            },
+            }
             Err(e) => {
-                eprintln!("Failed to fetch events from calendar {}: {}", calendar_path, e);
+                eprintln!(
+                    "Failed to fetch events from calendar {}: {}",
+                    calendar_path, e
+                );
                 continue;
             }
         }
@@ -565,7 +700,8 @@ pub async fn update_event(
         .ok_or_else(|| ApiError::NotFound(format!("Event with UID '{}' not found", request.uid)))?;
 
     // Parse dates and times
-    let start_datetime = parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
+    let start_datetime =
+        parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
             .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
 
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
@@ -573,15 +709,29 @@ pub async fn update_event(
 
     // Validate that end is after start
     if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest("End date/time must be after start date/time".to_string()));
+        return Err(ApiError::BadRequest(
+            "End date/time must be after start date/time".to_string(),
+        ));
     }
 
     // Update event properties
     event.dtstart = start_datetime;
     event.dtend = Some(end_datetime);
-    event.summary = if request.title.trim().is_empty() { None } else { Some(request.title) };
+    event.summary = if request.title.trim().is_empty() {
-    event.description = if request.description.trim().is_empty() { None } else { Some(request.description) };
+        None
-    event.location = if request.location.trim().is_empty() { None } else { Some(request.location) };
+    } else {
+        Some(request.title)
+    };
+    event.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description)
+    };
+    event.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location)
+    };
     event.all_day = request.all_day;
 
     // Parse and update status
@@ -601,8 +751,12 @@ pub async fn update_event(
     event.priority = request.priority;
 
     // Update the event on the CalDAV server
-    println!("📝 Updating event {} at calendar_path: {}, event_href: {}", event.uid, calendar_path, event_href);
+    println!(
-    client.update_event(&calendar_path, &event, &event_href)
+        "📝 Updating event {} at calendar_path: {}, event_href: {}",
+        event.uid, calendar_path, event_href
+    );
+    client
+        .update_event(&calendar_path, &event, &event_href)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to update event: {}", e)))?;
 
@@ -614,8 +768,12 @@ pub async fn update_event(
     }))
 }
 
-fn parse_event_datetime(date_str: &str, time_str: &str, all_day: bool) -> Result<chrono::DateTime<chrono::Utc>, String> {
+fn parse_event_datetime(
-    use chrono::{NaiveDate, NaiveTime, NaiveDateTime, Utc, TimeZone};
+    date_str: &str,
+    time_str: &str,
+    all_day: bool,
+) -> Result<chrono::DateTime<chrono::Utc>, String> {
+    use chrono::{NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
 
     // Parse the date
     let date = NaiveDate::parse_from_str(date_str, "%Y-%m-%d")
@@ -623,7 +781,8 @@ fn parse_event_datetime(date_str: &str, time_str: &str, all_day: bool) -> Result
 
     if all_day {
         // For all-day events, use midnight UTC
-        let datetime = date.and_hms_opt(0, 0, 0)
+        let datetime = date
+            .and_hms_opt(0, 0, 0)
             .ok_or_else(|| "Failed to create midnight datetime".to_string())?;
         Ok(Utc.from_utc_datetime(&datetime))
     } else {

backend/src/handlers/preferences.rs

@@ -0,0 +1,123 @@
+use axum::{
+    extract::State,
+    http::{HeaderMap, StatusCode},
+    response::IntoResponse,
+    Json,
+};
+use std::sync::Arc;
+
+use crate::{
+    db::PreferencesRepository,
+    models::{ApiError, UpdatePreferencesRequest, UserPreferencesResponse},
+    AppState,
+};
+
+/// Get user preferences
+pub async fn get_preferences(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Validate session and get user ID
+    let user_id = state.auth_service.validate_session(session_token).await?;
+
+    // Get preferences from database
+    let prefs_repo = PreferencesRepository::new(&state.db);
+    let preferences = prefs_repo
+        .get_or_create(&user_id)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
+
+    Ok(Json(UserPreferencesResponse {
+        calendar_selected_date: preferences.calendar_selected_date,
+        calendar_time_increment: preferences.calendar_time_increment,
+        calendar_view_mode: preferences.calendar_view_mode,
+        calendar_theme: preferences.calendar_theme,
+        calendar_colors: preferences.calendar_colors,
+    }))
+}
+
+/// Update user preferences
+pub async fn update_preferences(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+    Json(request): Json<UpdatePreferencesRequest>,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Validate session and get user ID
+    let user_id = state.auth_service.validate_session(session_token).await?;
+
+    // Update preferences in database
+    let prefs_repo = PreferencesRepository::new(&state.db);
+    
+    let mut preferences = prefs_repo
+        .get_or_create(&user_id)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
+
+    // Update only provided fields
+    if request.calendar_selected_date.is_some() {
+        preferences.calendar_selected_date = request.calendar_selected_date;
+    }
+    if request.calendar_time_increment.is_some() {
+        preferences.calendar_time_increment = request.calendar_time_increment;
+    }
+    if request.calendar_view_mode.is_some() {
+        preferences.calendar_view_mode = request.calendar_view_mode;
+    }
+    if request.calendar_theme.is_some() {
+        preferences.calendar_theme = request.calendar_theme;
+    }
+    if request.calendar_colors.is_some() {
+        preferences.calendar_colors = request.calendar_colors;
+    }
+
+    prefs_repo
+        .update(&preferences)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to update preferences: {}", e)))?;
+
+    Ok((
+        StatusCode::OK,
+        Json(UserPreferencesResponse {
+            calendar_selected_date: preferences.calendar_selected_date,
+            calendar_time_increment: preferences.calendar_time_increment,
+            calendar_view_mode: preferences.calendar_view_mode,
+            calendar_theme: preferences.calendar_theme,
+            calendar_colors: preferences.calendar_colors,
+        }),
+    ))
+}
+
+/// Logout user
+pub async fn logout(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Delete session
+    state.auth_service.logout(session_token).await?;
+
+    Ok((
+        StatusCode::OK,
+        Json(serde_json::json!({
+            "success": true,
+            "message": "Logged out successfully"
+        })),
+    ))
+}

backend/src/handlers/series.rs

@@ -1,14 +1,16 @@
-use axum::{
+use axum::{extract::State, http::HeaderMap, response::Json};
-    extract::State,
-    http::HeaderMap,
-    response::Json,
-};
-use std::sync::Arc;
 use chrono::TimeZone;
+use std::sync::Arc;
 
-use crate::{AppState, models::{ApiError, CreateEventSeriesRequest, CreateEventSeriesResponse, UpdateEventSeriesRequest, UpdateEventSeriesResponse, DeleteEventSeriesRequest, DeleteEventSeriesResponse}};
 use crate::calendar::CalDAVClient;
-use calendar_models::{VEvent, EventStatus, EventClass};
+use crate::{
+    models::{
+        ApiError, CreateEventSeriesRequest, CreateEventSeriesResponse, DeleteEventSeriesRequest,
+        DeleteEventSeriesResponse, UpdateEventSeriesRequest, UpdateEventSeriesResponse,
+    },
+    AppState,
+};
+use calendar_models::{EventClass, EventStatus, VEvent};
 
 use super::auth::{extract_bearer_token, extract_password_header};
 
@@ -18,8 +20,10 @@ pub async fn create_event_series(
     headers: HeaderMap,
     Json(request): Json<CreateEventSeriesRequest>,
 ) -> Result<Json<CreateEventSeriesResponse>, ApiError> {
-    println!("📝 Create event series request received: title='{}', recurrence='{}', all_day={}", 
+    println!(
-             request.title, request.recurrence, request.all_day);
+        "📝 Create event series request received: title='{}', recurrence='{}', all_day={}",
+        request.title, request.recurrence, request.all_day
+    );
 
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
@@ -31,11 +35,15 @@ pub async fn create_event_series(
     }
 
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     if request.recurrence == "none" {
-        return Err(ApiError::BadRequest("Use regular create endpoint for non-recurring events".to_string()));
+        return Err(ApiError::BadRequest(
+            "Use regular create endpoint for non-recurring events".to_string(),
+        ));
     }
 
     // Validate recurrence type - handle both simple strings and RRULE strings
@@ -50,7 +58,9 @@ pub async fn create_event_series(
         } else if request.recurrence.contains("FREQ=YEARLY") {
             "yearly"
         } else {
-            return Err(ApiError::BadRequest("Invalid RRULE frequency. Must be DAILY, WEEKLY, MONTHLY, or YEARLY".to_string()));
+            return Err(ApiError::BadRequest(
+                "Invalid RRULE frequency. Must be DAILY, WEEKLY, MONTHLY, or YEARLY".to_string(),
+            ));
         }
     } else {
         // Handle simple strings
@@ -60,12 +70,19 @@ pub async fn create_event_series(
             "weekly" => "weekly",
             "monthly" => "monthly",
             "yearly" => "yearly",
-            _ => return Err(ApiError::BadRequest("Invalid recurrence type. Must be daily, weekly, monthly, or yearly".to_string())),
+            _ => {
+                return Err(ApiError::BadRequest(
+                    "Invalid recurrence type. Must be daily, weekly, monthly, or yearly"
+                        .to_string(),
+                ))
+            }
         }
     };
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Determine which calendar to use
@@ -73,12 +90,15 @@ pub async fn create_event_series(
         path.clone()
     } else {
         // Use the first available calendar
-        let calendar_paths = client.discover_calendars()
+        let calendar_paths = client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
         if calendar_paths.is_empty() {
-            return Err(ApiError::BadRequest("No calendars available for event creation".to_string()));
+            return Err(ApiError::BadRequest(
+                "No calendars available for event creation".to_string(),
+            ));
         }
 
         calendar_paths[0].clone()
@@ -87,37 +107,47 @@ pub async fn create_event_series(
     println!("📅 Using calendar path: {}", calendar_path);
 
     // Parse datetime components
-    let start_date = chrono::NaiveDate::parse_from_str(&request.start_date, "%Y-%m-%d")
+    let start_date =
-        .map_err(|_| ApiError::BadRequest("Invalid start_date format. Expected YYYY-MM-DD".to_string()))?;
+        chrono::NaiveDate::parse_from_str(&request.start_date, "%Y-%m-%d").map_err(|_| {
+            ApiError::BadRequest("Invalid start_date format. Expected YYYY-MM-DD".to_string())
+        })?;
 
     let (start_datetime, end_datetime) = if request.all_day {
         // For all-day events, use the dates as-is
-        let start_dt = start_date.and_hms_opt(0, 0, 0)
+        let start_dt = start_date
+            .and_hms_opt(0, 0, 0)
             .ok_or_else(|| ApiError::BadRequest("Invalid start date".to_string()))?;
 
         let end_date = if !request.end_date.is_empty() {
-            chrono::NaiveDate::parse_from_str(&request.end_date, "%Y-%m-%d")
+            chrono::NaiveDate::parse_from_str(&request.end_date, "%Y-%m-%d").map_err(|_| {
-                .map_err(|_| ApiError::BadRequest("Invalid end_date format. Expected YYYY-MM-DD".to_string()))?
+                ApiError::BadRequest("Invalid end_date format. Expected YYYY-MM-DD".to_string())
+            })?
         } else {
             start_date
         };
 
-        let end_dt = end_date.and_hms_opt(23, 59, 59)
+        let end_dt = end_date
+            .and_hms_opt(23, 59, 59)
             .ok_or_else(|| ApiError::BadRequest("Invalid end date".to_string()))?;
 
-        (chrono::Utc.from_utc_datetime(&start_dt), chrono::Utc.from_utc_datetime(&end_dt))
+        (
+            chrono::Utc.from_utc_datetime(&start_dt),
+            chrono::Utc.from_utc_datetime(&end_dt),
+        )
     } else {
         // Parse times for timed events
         let start_time = if !request.start_time.is_empty() {
-            chrono::NaiveTime::parse_from_str(&request.start_time, "%H:%M")
+            chrono::NaiveTime::parse_from_str(&request.start_time, "%H:%M").map_err(|_| {
-                .map_err(|_| ApiError::BadRequest("Invalid start_time format. Expected HH:MM".to_string()))?
+                ApiError::BadRequest("Invalid start_time format. Expected HH:MM".to_string())
+            })?
         } else {
             chrono::NaiveTime::from_hms_opt(9, 0, 0).unwrap() // Default to 9 AM
         };
 
         let end_time = if !request.end_time.is_empty() {
-            chrono::NaiveTime::parse_from_str(&request.end_time, "%H:%M")
+            chrono::NaiveTime::parse_from_str(&request.end_time, "%H:%M").map_err(|_| {
-                .map_err(|_| ApiError::BadRequest("Invalid end_time format. Expected HH:MM".to_string()))?
+                ApiError::BadRequest("Invalid end_time format. Expected HH:MM".to_string())
+            })?
         } else {
             chrono::NaiveTime::from_hms_opt(10, 0, 0).unwrap() // Default to 1 hour duration
         };
@@ -125,13 +155,18 @@ pub async fn create_event_series(
         let start_dt = start_date.and_time(start_time);
         let end_dt = if !request.end_date.is_empty() {
             let end_date = chrono::NaiveDate::parse_from_str(&request.end_date, "%Y-%m-%d")
-                .map_err(|_| ApiError::BadRequest("Invalid end_date format. Expected YYYY-MM-DD".to_string()))?;
+                .map_err(|_| {
+                    ApiError::BadRequest("Invalid end_date format. Expected YYYY-MM-DD".to_string())
+                })?;
             end_date.and_time(end_time)
         } else {
             start_date.and_time(end_time)
         };
 
-        (chrono::Utc.from_utc_datetime(&start_dt), chrono::Utc.from_utc_datetime(&end_dt))
+        (
+            chrono::Utc.from_utc_datetime(&start_dt),
+            chrono::Utc.from_utc_datetime(&end_dt),
+        )
     };
 
     // Generate a unique UID for the series
@@ -140,9 +175,21 @@ pub async fn create_event_series(
     // Create the VEvent for the series
     let mut event = VEvent::new(uid.clone(), start_datetime);
     event.dtend = Some(end_datetime);
-    event.summary = if request.title.trim().is_empty() { None } else { Some(request.title.clone()) };
+    event.summary = if request.title.trim().is_empty() {
-    event.description = if request.description.trim().is_empty() { None } else { Some(request.description.clone()) };
+        None
-    event.location = if request.location.trim().is_empty() { None } else { Some(request.location.clone()) };
+    } else {
+        Some(request.title.clone())
+    };
+    event.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description.clone())
+    };
+    event.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location.clone())
+    };
 
     // Set event status
     event.status = Some(match request.status.to_lowercase().as_str() {
@@ -171,13 +218,16 @@ pub async fn create_event_series(
     };
     event.rrule = Some(rrule);
 
-
     // Create the event on the CalDAV server
-    let event_href = client.create_event(&calendar_path, &event)
+    let event_href = client
+        .create_event(&calendar_path, &event)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to create event series: {}", e)))?;
 
-    println!("✅ Event series created successfully with UID: {}, href: {}", uid, event_href);
+    println!(
+        "✅ Event series created successfully with UID: {}, href: {}",
+        uid, event_href
+    );
 
     Ok(Json(CreateEventSeriesResponse {
         success: true,
@@ -194,8 +244,10 @@ pub async fn update_event_series(
     headers: HeaderMap,
     Json(request): Json<UpdateEventSeriesRequest>,
 ) -> Result<Json<UpdateEventSeriesResponse>, ApiError> {
-    println!("🔄 Update event series request received: series_uid='{}', update_scope='{}'", 
+    println!(
-             request.series_uid, request.update_scope);
+        "🔄 Update event series request received: series_uid='{}', update_scope='{}'",
+        request.series_uid, request.update_scope
+    );
 
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
@@ -211,13 +263,20 @@ pub async fn update_event_series(
     }
 
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     // Validate update scope
     match request.update_scope.as_str() {
-        "this_only" | "this_and_future" | "all_in_series" => {},
+        "this_only" | "this_and_future" | "all_in_series" => {}
-        _ => return Err(ApiError::BadRequest("Invalid update_scope. Must be: this_only, this_and_future, or all_in_series".to_string())),
+        _ => {
+            return Err(ApiError::BadRequest(
+                "Invalid update_scope. Must be: this_only, this_and_future, or all_in_series"
+                    .to_string(),
+            ))
+        }
     }
 
     // Validate recurrence type - handle both simple strings and RRULE strings
@@ -232,7 +291,9 @@ pub async fn update_event_series(
         } else if request.recurrence.contains("FREQ=YEARLY") {
             "yearly"
         } else {
-            return Err(ApiError::BadRequest("Invalid RRULE frequency. Must be DAILY, WEEKLY, MONTHLY, or YEARLY".to_string()));
+            return Err(ApiError::BadRequest(
+                "Invalid RRULE frequency. Must be DAILY, WEEKLY, MONTHLY, or YEARLY".to_string(),
+            ));
         }
     } else {
         // Handle simple strings
@@ -242,12 +303,19 @@ pub async fn update_event_series(
             "weekly" => "weekly",
             "monthly" => "monthly",
             "yearly" => "yearly",
-            _ => return Err(ApiError::BadRequest("Invalid recurrence type. Must be daily, weekly, monthly, or yearly".to_string())),
+            _ => {
+                return Err(ApiError::BadRequest(
+                    "Invalid recurrence type. Must be daily, weekly, monthly, or yearly"
+                        .to_string(),
+                ))
+            }
         }
     };
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Use the parsed frequency for further processing (avoiding unused variable warning)
@@ -257,13 +325,16 @@ pub async fn update_event_series(
     let calendar_paths = if let Some(ref path) = request.calendar_path {
         vec![path.clone()]
     } else {
-        client.discover_calendars()
+        client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?
     };
 
     if calendar_paths.is_empty() {
-        return Err(ApiError::BadRequest("No calendars available for event update".to_string()));
+        return Err(ApiError::BadRequest(
+            "No calendars available for event update".to_string(),
+        ));
     }
 
     // Find the series event across all specified calendars
@@ -278,34 +349,46 @@ pub async fn update_event_series(
         }
     }
 
-    let mut existing_event = existing_event
+    let mut existing_event = existing_event.ok_or_else(|| {
-        .ok_or_else(|| ApiError::NotFound(format!("Event series with UID '{}' not found", request.series_uid)))?;
+        ApiError::NotFound(format!(
+            "Event series with UID '{}' not found",
+            request.series_uid
+        ))
+    })?;
 
     println!("📅 Found series event in calendar: {}", calendar_path);
-    println!("📅 Event details: UID={}, summary={:?}, dtstart={}", 
+    println!(
-             existing_event.uid, existing_event.summary, existing_event.dtstart);
+        "📅 Event details: UID={}, summary={:?}, dtstart={}",
+        existing_event.uid, existing_event.summary, existing_event.dtstart
+    );
 
     // Parse datetime components for the update
     let original_start_date = existing_event.dtstart.date_naive();
 
     // For "this_and_future" and "this_only" updates, use the occurrence date for the modified event
     // For "all_in_series" updates, preserve the original series start date
-    let start_date = if (request.update_scope == "this_and_future" || request.update_scope == "this_only") && request.occurrence_date.is_some() {
+    let start_date = if (request.update_scope == "this_and_future"
+        || request.update_scope == "this_only")
+        && request.occurrence_date.is_some()
+    {
         let occurrence_date_str = request.occurrence_date.as_ref().unwrap();
-        chrono::NaiveDate::parse_from_str(occurrence_date_str, "%Y-%m-%d")
+        chrono::NaiveDate::parse_from_str(occurrence_date_str, "%Y-%m-%d").map_err(|_| {
-            .map_err(|_| ApiError::BadRequest("Invalid occurrence_date format. Expected YYYY-MM-DD".to_string()))?
+            ApiError::BadRequest("Invalid occurrence_date format. Expected YYYY-MM-DD".to_string())
+        })?
     } else {
         original_start_date
     };
 
     let (start_datetime, end_datetime) = if request.all_day {
-        let start_dt = start_date.and_hms_opt(0, 0, 0)
+        let start_dt = start_date
+            .and_hms_opt(0, 0, 0)
             .ok_or_else(|| ApiError::BadRequest("Invalid start date".to_string()))?;
 
         // For all-day events, also preserve the original date pattern
         let end_date = if !request.end_date.is_empty() {
             // Calculate the duration from the original event
-            let original_duration_days = existing_event.dtend
+            let original_duration_days = existing_event
+                .dtend
                 .map(|end| (end.date_naive() - existing_event.dtstart.date_naive()).num_days())
                 .unwrap_or(0);
             start_date + chrono::Duration::days(original_duration_days)
@@ -313,25 +396,32 @@ pub async fn update_event_series(
             start_date
         };
 
-        let end_dt = end_date.and_hms_opt(23, 59, 59)
+        let end_dt = end_date
+            .and_hms_opt(23, 59, 59)
             .ok_or_else(|| ApiError::BadRequest("Invalid end date".to_string()))?;
 
-        (chrono::Utc.from_utc_datetime(&start_dt), chrono::Utc.from_utc_datetime(&end_dt))
+        (
+            chrono::Utc.from_utc_datetime(&start_dt),
+            chrono::Utc.from_utc_datetime(&end_dt),
+        )
     } else {
         let start_time = if !request.start_time.is_empty() {
-            chrono::NaiveTime::parse_from_str(&request.start_time, "%H:%M")
+            chrono::NaiveTime::parse_from_str(&request.start_time, "%H:%M").map_err(|_| {
-                .map_err(|_| ApiError::BadRequest("Invalid start_time format. Expected HH:MM".to_string()))?
+                ApiError::BadRequest("Invalid start_time format. Expected HH:MM".to_string())
+            })?
         } else {
             existing_event.dtstart.time()
         };
 
         let end_time = if !request.end_time.is_empty() {
-            chrono::NaiveTime::parse_from_str(&request.end_time, "%H:%M")
+            chrono::NaiveTime::parse_from_str(&request.end_time, "%H:%M").map_err(|_| {
-                .map_err(|_| ApiError::BadRequest("Invalid end_time format. Expected HH:MM".to_string()))?
+                ApiError::BadRequest("Invalid end_time format. Expected HH:MM".to_string())
+            })?
         } else {
-            existing_event.dtend.map(|dt| dt.time()).unwrap_or_else(|| {
+            existing_event
-                existing_event.dtstart.time() + chrono::Duration::hours(1)
+                .dtend
-            })
+                .map(|dt| dt.time())
+                .unwrap_or_else(|| existing_event.dtstart.time() + chrono::Duration::hours(1))
         };
 
         let start_dt = start_date.and_time(start_time);
@@ -340,13 +430,17 @@ pub async fn update_event_series(
             start_date.and_time(end_time)
         } else {
             // Calculate end time based on original duration
-            let original_duration = existing_event.dtend
+            let original_duration = existing_event
+                .dtend
                 .map(|end| end - existing_event.dtstart)
                 .unwrap_or_else(|| chrono::Duration::hours(1));
             (chrono::Utc.from_utc_datetime(&start_dt) + original_duration).naive_utc()
         };
 
-        (chrono::Utc.from_utc_datetime(&start_dt), chrono::Utc.from_utc_datetime(&end_dt))
+        (
+            chrono::Utc.from_utc_datetime(&start_dt),
+            chrono::Utc.from_utc_datetime(&end_dt),
+        )
     };
 
     // Handle different update scopes
@@ -354,39 +448,73 @@ pub async fn update_event_series(
         "all_in_series" => {
             // Update the entire series - modify the master event
             update_entire_series(&mut existing_event, &request, start_datetime, end_datetime)?
-        },
+        }
         "this_and_future" => {
             // Split the series: keep past occurrences, create new series from occurrence date
-            update_this_and_future(&mut existing_event, &request, start_datetime, end_datetime, &client, &calendar_path).await?
+            update_this_and_future(
-        },
+                &mut existing_event,
+                &request,
+                start_datetime,
+                end_datetime,
+                &client,
+                &calendar_path,
+            )
+            .await?
+        }
         "this_only" => {
             // Create exception for single occurrence, keep original series
-            let event_href = existing_event.href.as_ref()
+            let event_href = existing_event
-                .ok_or_else(|| ApiError::Internal("Event missing href for single occurrence update".to_string()))?
+                .href
+                .as_ref()
+                .ok_or_else(|| {
+                    ApiError::Internal(
+                        "Event missing href for single occurrence update".to_string(),
+                    )
+                })?
                 .clone();
-            update_single_occurrence(&mut existing_event, &request, start_datetime, end_datetime, &client, &calendar_path, &event_href).await?
+            update_single_occurrence(
-        },
+                &mut existing_event,
+                &request,
+                start_datetime,
+                end_datetime,
+                &client,
+                &calendar_path,
+                &event_href,
+            )
+            .await?
+        }
         _ => unreachable!(), // Already validated above
     };
 
     // Update the event on the CalDAV server using the original event's href
     println!("📤 Updating event on CalDAV server...");
-    let event_href = existing_event.href.as_ref()
+    let event_href = existing_event
+        .href
+        .as_ref()
         .ok_or_else(|| ApiError::Internal("Event missing href for update".to_string()))?;
     println!("📤 Using event href: {}", event_href);
     println!("📤 Calendar path: {}", calendar_path);
 
-    match client.update_event(&calendar_path, &updated_event, event_href).await {
+    match client
+        .update_event(&calendar_path, &updated_event, event_href)
+        .await
+    {
         Ok(_) => {
             println!("✅ CalDAV update completed successfully");
         }
         Err(e) => {
             println!("❌ CalDAV update failed: {}", e);
-            return Err(ApiError::Internal(format!("Failed to update event series: {}", e)));
+            return Err(ApiError::Internal(format!(
+                "Failed to update event series: {}",
+                e
+            )));
         }
     }
 
-    println!("✅ Event series updated successfully with UID: {}", request.series_uid);
+    println!(
+        "✅ Event series updated successfully with UID: {}",
+        request.series_uid
+    );
 
     Ok(Json(UpdateEventSeriesResponse {
         success: true,
@@ -402,8 +530,10 @@ pub async fn delete_event_series(
     headers: HeaderMap,
     Json(request): Json<DeleteEventSeriesRequest>,
 ) -> Result<Json<DeleteEventSeriesResponse>, ApiError> {
-    println!("🗑️ Delete event series request received: series_uid='{}', delete_scope='{}'", 
+    println!(
-             request.series_uid, request.delete_scope);
+        "🗑️ Delete event series request received: series_uid='{}', delete_scope='{}'",
+        request.series_uid, request.delete_scope
+    );
 
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
@@ -415,7 +545,9 @@ pub async fn delete_event_series(
     }
 
     if request.calendar_path.trim().is_empty() {
-        return Err(ApiError::BadRequest("Calendar path is required".to_string()));
+        return Err(ApiError::BadRequest(
+            "Calendar path is required".to_string(),
+        ));
     }
 
     if request.event_href.trim().is_empty() {
@@ -424,12 +556,19 @@ pub async fn delete_event_series(
 
     // Validate delete scope
     match request.delete_scope.as_str() {
-        "this_only" | "this_and_future" | "all_in_series" => {},
+        "this_only" | "this_and_future" | "all_in_series" => {}
-        _ => return Err(ApiError::BadRequest("Invalid delete_scope. Must be: this_only, this_and_future, or all_in_series".to_string())),
+        _ => {
+            return Err(ApiError::BadRequest(
+                "Invalid delete_scope. Must be: this_only, this_and_future, or all_in_series"
+                    .to_string(),
+            ))
+        }
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Handle different deletion scopes
@@ -437,19 +576,22 @@ pub async fn delete_event_series(
         "all_in_series" => {
             // Delete the entire series - simply delete the event
             delete_entire_series(&client, &request).await?
-        },
+        }
         "this_and_future" => {
             // Modify RRULE to end before this occurrence
             delete_this_and_future(&client, &request).await?
-        },
+        }
         "this_only" => {
             // Add EXDATE for single occurrence
             delete_single_occurrence(&client, &request).await?
-        },
+        }
         _ => unreachable!(), // Already validated above
     };
 
-    println!("✅ Event series deletion completed with {} occurrences affected", occurrences_affected);
+    println!(
+        "✅ Event series deletion completed with {} occurrences affected",
+        occurrences_affected
+    );
 
     Ok(Json(DeleteEventSeriesResponse {
         success: true,
@@ -460,8 +602,10 @@ pub async fn delete_event_series(
 
 // Helper functions
 
-
+fn build_series_rrule_with_freq(
-fn build_series_rrule_with_freq(request: &CreateEventSeriesRequest, freq: &str) -> Result<String, ApiError> {
+    request: &CreateEventSeriesRequest,
+    freq: &str,
+) -> Result<String, ApiError> {
     let mut rrule_parts = Vec::new();
 
     // Add frequency
@@ -470,7 +614,11 @@ fn build_series_rrule_with_freq(request: &CreateEventSeriesRequest, freq: &str)
         "weekly" => rrule_parts.push("FREQ=WEEKLY".to_string()),
         "monthly" => rrule_parts.push("FREQ=MONTHLY".to_string()),
         "yearly" => rrule_parts.push("FREQ=YEARLY".to_string()),
-        _ => return Err(ApiError::BadRequest("Invalid recurrence frequency".to_string())),
+        _ => {
+            return Err(ApiError::BadRequest(
+                "Invalid recurrence frequency".to_string(),
+            ))
+        }
     }
 
     // Add interval if specified and greater than 1
@@ -482,7 +630,8 @@ fn build_series_rrule_with_freq(request: &CreateEventSeriesRequest, freq: &str)
 
     // Handle weekly recurrence with specific days (BYDAY)
     if freq == "weekly" && request.recurrence_days.len() == 7 {
-        let selected_days: Vec<&str> = request.recurrence_days
+        let selected_days: Vec<&str> = request
+            .recurrence_days
             .iter()
             .enumerate()
             .filter_map(|(i, &selected)| {
@@ -513,12 +662,17 @@ fn build_series_rrule_with_freq(request: &CreateEventSeriesRequest, freq: &str)
         // Parse the end date and convert to RRULE format (YYYYMMDDTHHMMSSZ)
         match chrono::NaiveDate::parse_from_str(end_date, "%Y-%m-%d") {
             Ok(date) => {
-                let end_datetime = date.and_hms_opt(23, 59, 59)
+                let end_datetime = date
+                    .and_hms_opt(23, 59, 59)
                     .ok_or_else(|| ApiError::BadRequest("Invalid end date".to_string()))?;
                 let utc_end = chrono::Utc.from_utc_datetime(&end_datetime);
                 rrule_parts.push(format!("UNTIL={}", utc_end.format("%Y%m%dT%H%M%SZ")));
-            },
+            }
-            Err(_) => return Err(ApiError::BadRequest("Invalid recurrence_end_date format. Expected YYYY-MM-DD".to_string())),
+            Err(_) => {
+                return Err(ApiError::BadRequest(
+                    "Invalid recurrence_end_date format. Expected YYYY-MM-DD".to_string(),
+                ))
+            }
         }
     } else if let Some(count) = request.recurrence_count {
         if count > 0 {
@@ -641,30 +795,42 @@ async fn update_this_and_future(
     client: &CalDAVClient,
     calendar_path: &str,
 ) -> Result<(VEvent, u32), ApiError> {
-    
     // Clone the existing event to create the new series before modifying the RRULE of the
     // original, because we'd like to preserve the original UNTIL logic
     let mut new_series = existing_event.clone();
-    let occurrence_date = request.occurrence_date.as_ref()
+    let occurrence_date = request.occurrence_date.as_ref().ok_or_else(|| {
-        .ok_or_else(|| ApiError::BadRequest("occurrence_date is required for this_and_future updates".to_string()))?;
+        ApiError::BadRequest("occurrence_date is required for this_and_future updates".to_string())
+    })?;
 
     // Parse occurrence date
     let occurrence_date_parsed = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
         .map_err(|_| ApiError::BadRequest("Invalid occurrence date format".to_string()))?;
 
     // Step 1: Add UNTIL to the original series to stop before the occurrence date
-    let until_datetime = occurrence_date_parsed.and_hms_opt(0, 0, 0)
+    let until_datetime = occurrence_date_parsed
+        .and_hms_opt(0, 0, 0)
         .ok_or_else(|| ApiError::BadRequest("Invalid occurrence date".to_string()))?;
     let utc_until = chrono::Utc.from_utc_datetime(&until_datetime);
 
     // Create modified RRULE with UNTIL clause for the original series
-    let original_rrule = existing_event.rrule.clone().unwrap_or_else(|| "FREQ=WEEKLY".to_string());
+    let original_rrule = existing_event
-    let parts: Vec<&str> = original_rrule.split(';').filter(|part| {
+        .rrule
-        !part.starts_with("UNTIL=") && !part.starts_with("COUNT=")
+        .clone()
-    }).collect();
+        .unwrap_or_else(|| "FREQ=WEEKLY".to_string());
+    let parts: Vec<&str> = original_rrule
+        .split(';')
+        .filter(|part| !part.starts_with("UNTIL=") && !part.starts_with("COUNT="))
+        .collect();
 
-    existing_event.rrule = Some(format!("{};UNTIL={}", parts.join(";"), utc_until.format("%Y%m%dT%H%M%SZ")));
+    existing_event.rrule = Some(format!(
-    println!("🔄 this_and_future: Updated original series RRULE: {:?}", existing_event.rrule);
+        "{};UNTIL={}",
+        parts.join(";"),
+        utc_until.format("%Y%m%dT%H%M%SZ")
+    ));
+    println!(
+        "🔄 this_and_future: Updated original series RRULE: {:?}",
+        existing_event.rrule
+    );
 
     // Step 2: Create a new series starting from the occurrence date with updated properties
     let new_series_uid = format!("series-{}", uuid::Uuid::new_v4());
@@ -673,9 +839,21 @@ async fn update_this_and_future(
     new_series.uid = new_series_uid.clone();
     new_series.dtstart = start_datetime;
     new_series.dtend = Some(end_datetime);
-    new_series.summary = if request.title.trim().is_empty() { None } else { Some(request.title.clone()) };
+    new_series.summary = if request.title.trim().is_empty() {
-    new_series.description = if request.description.trim().is_empty() { None } else { Some(request.description.clone()) };
+        None
-    new_series.location = if request.location.trim().is_empty() { None } else { Some(request.location.clone()) };
+    } else {
+        Some(request.title.clone())
+    };
+    new_series.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description.clone())
+    };
+    new_series.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location.clone())
+    };
 
     new_series.status = Some(match request.status.to_lowercase().as_str() {
         "tentative" => EventStatus::Tentative,
@@ -698,11 +876,18 @@ async fn update_this_and_future(
     new_series.last_modified = Some(now);
     new_series.href = None; // Will be set when created
 
-    println!("🔄 this_and_future: Creating new series with UID: {}", new_series_uid);
+    println!(
-    println!("🔄 this_and_future: New series RRULE: {:?}", new_series.rrule);
+        "🔄 this_and_future: Creating new series with UID: {}",
+        new_series_uid
+    );
+    println!(
+        "🔄 this_and_future: New series RRULE: {:?}",
+        new_series.rrule
+    );
 
     // Create the new series on CalDAV server
-    client.create_event(calendar_path, &new_series)
+    client
+        .create_event(calendar_path, &new_series)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to create new series: {}", e)))?;
 
@@ -727,12 +912,17 @@ async fn update_single_occurrence(
     // 2. Create a new exception event with RECURRENCE-ID pointing to the original occurrence
 
     // First, add EXDATE to the original series
-    let occurrence_date = request.occurrence_date.as_ref()
+    let occurrence_date = request.occurrence_date.as_ref().ok_or_else(|| {
-        .ok_or_else(|| ApiError::BadRequest("occurrence_date is required for single occurrence updates".to_string()))?;
+        ApiError::BadRequest(
+            "occurrence_date is required for single occurrence updates".to_string(),
+        )
+    })?;
 
     // Parse the occurrence date
-    let exception_date = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+    let exception_date =
-        .map_err(|_| ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string()))?;
+        chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d").map_err(|_| {
+            ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string())
+        })?;
 
     // Create the EXDATE datetime using the original event's time
     let original_time = existing_event.dtstart.time();
@@ -740,10 +930,19 @@ async fn update_single_occurrence(
     let exception_utc = chrono::Utc.from_utc_datetime(&exception_datetime);
 
     // Add the exception date to the original series
-    println!("📝 BEFORE adding EXDATE: existing_event.exdate = {:?}", existing_event.exdate);
+    println!(
+        "📝 BEFORE adding EXDATE: existing_event.exdate = {:?}",
+        existing_event.exdate
+    );
     existing_event.exdate.push(exception_utc);
-    println!("📝 AFTER adding EXDATE: existing_event.exdate = {:?}", existing_event.exdate);
+    println!(
-    println!("🚫 Added EXDATE for single occurrence modification: {}", exception_utc.format("%Y-%m-%d %H:%M:%S"));
+        "📝 AFTER adding EXDATE: existing_event.exdate = {:?}",
+        existing_event.exdate
+    );
+    println!(
+        "🚫 Added EXDATE for single occurrence modification: {}",
+        exception_utc.format("%Y-%m-%d %H:%M:%S")
+    );
 
     // Create exception event by cloning the existing event to preserve all metadata
     let mut exception_event = existing_event.clone();
@@ -801,10 +1000,14 @@ async fn update_single_occurrence(
     // Set calendar path for the exception event
     exception_event.calendar_path = Some(calendar_path.to_string());
 
-    println!("✨ Created exception event with RECURRENCE-ID: {}", exception_utc.format("%Y-%m-%d %H:%M:%S"));
+    println!(
+        "✨ Created exception event with RECURRENCE-ID: {}",
+        exception_utc.format("%Y-%m-%d %H:%M:%S")
+    );
 
     // Create the exception event as a new event (original series will be updated by main handler)
-    client.create_event(calendar_path, &exception_event)
+    client
+        .create_event(calendar_path, &exception_event)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to create exception event: {}", e)))?;
 
@@ -820,7 +1023,8 @@ async fn delete_entire_series(
     request: &DeleteEventSeriesRequest,
 ) -> Result<u32, ApiError> {
     // Simply delete the entire event from the CalDAV server
-    client.delete_event(&request.calendar_path, &request.event_href)
+    client
+        .delete_event(&request.calendar_path, &request.event_href)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to delete event series: {}", e)))?;
 
@@ -835,10 +1039,13 @@ async fn delete_this_and_future(
 ) -> Result<u32, ApiError> {
     // Fetch the existing event to modify its RRULE
     let event_uid = request.series_uid.clone();
-    let existing_event = client.fetch_event_by_uid(&request.calendar_path, &event_uid)
+    let existing_event = client
+        .fetch_event_by_uid(&request.calendar_path, &event_uid)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to fetch event for modification: {}", e)))?
-        .ok_or_else(|| ApiError::NotFound(format!("Event series with UID '{}' not found", event_uid)))?;
+        .ok_or_else(|| {
+            ApiError::NotFound(format!("Event series with UID '{}' not found", event_uid))
+        })?;
 
     // If no occurrence_date is provided, delete the entire series
     let Some(occurrence_date) = &request.occurrence_date else {
@@ -846,12 +1053,17 @@ async fn delete_this_and_future(
     };
 
     // Parse occurrence date to set as UNTIL for the RRULE
-    let until_date = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+    let until_date =
-        .map_err(|_| ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string()))?;
+        chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d").map_err(|_| {
+            ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string())
+        })?;
 
     // Set UNTIL to the day before the occurrence to exclude it and all future occurrences
-    let until_datetime = until_date.pred_opt()
+    let until_datetime = until_date
-        .ok_or_else(|| ApiError::BadRequest("Cannot delete from the first possible date".to_string()))?
+        .pred_opt()
+        .ok_or_else(|| {
+            ApiError::BadRequest("Cannot delete from the first possible date".to_string())
+        })?
         .and_hms_opt(23, 59, 59)
         .ok_or_else(|| ApiError::BadRequest("Invalid date calculation".to_string()))?;
     let utc_until = chrono::Utc.from_utc_datetime(&until_datetime);
@@ -860,19 +1072,30 @@ async fn delete_this_and_future(
     let mut updated_event = existing_event;
     if let Some(rrule) = &updated_event.rrule {
         // Remove existing UNTIL or COUNT if present and add new UNTIL
-        let parts: Vec<&str> = rrule.split(';').filter(|part| {
+        let parts: Vec<&str> = rrule
-            !part.starts_with("UNTIL=") && !part.starts_with("COUNT=")
+            .split(';')
-        }).collect();
+            .filter(|part| !part.starts_with("UNTIL=") && !part.starts_with("COUNT="))
+            .collect();
 
-        updated_event.rrule = Some(format!("{};UNTIL={}", parts.join(";"), utc_until.format("%Y%m%dT%H%M%SZ")));
+        updated_event.rrule = Some(format!(
+            "{};UNTIL={}",
+            parts.join(";"),
+            utc_until.format("%Y%m%dT%H%M%SZ")
+        ));
     }
 
     // Update the event on the CalDAV server
-    client.update_event(&request.calendar_path, &updated_event, &request.event_href)
+    client
+        .update_event(&request.calendar_path, &updated_event, &request.event_href)
         .await
-        .map_err(|e| ApiError::Internal(format!("Failed to update event series for deletion: {}", e)))?;
+        .map_err(|e| {
+            ApiError::Internal(format!("Failed to update event series for deletion: {}", e))
+        })?;
 
-    println!("🗑️ Series modified with UNTIL for this_and_future deletion: {}", utc_until.format("%Y-%m-%d"));
+    println!(
+        "🗑️ Series modified with UNTIL for this_and_future deletion: {}",
+        utc_until.format("%Y-%m-%d")
+    );
     Ok(1) // 1 series modified
 }
 
@@ -883,19 +1106,26 @@ async fn delete_single_occurrence(
 ) -> Result<u32, ApiError> {
     // Fetch the existing event to add EXDATE
     let event_uid = request.series_uid.clone();
-    let existing_event = client.fetch_event_by_uid(&request.calendar_path, &event_uid)
+    let existing_event = client
+        .fetch_event_by_uid(&request.calendar_path, &event_uid)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to fetch event for modification: {}", e)))?
-        .ok_or_else(|| ApiError::NotFound(format!("Event series with UID '{}' not found", event_uid)))?;
+        .ok_or_else(|| {
+            ApiError::NotFound(format!("Event series with UID '{}' not found", event_uid))
+        })?;
 
     // If no occurrence_date is provided, cannot delete single occurrence
     let Some(occurrence_date) = &request.occurrence_date else {
-        return Err(ApiError::BadRequest("occurrence_date is required for single occurrence deletion".to_string()));
+        return Err(ApiError::BadRequest(
+            "occurrence_date is required for single occurrence deletion".to_string(),
+        ));
     };
 
     // Parse occurrence date
-    let exception_date = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+    let exception_date =
-        .map_err(|_| ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string()))?;
+        chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d").map_err(|_| {
+            ApiError::BadRequest("Invalid occurrence date format. Expected YYYY-MM-DD".to_string())
+        })?;
 
     // Create the EXDATE datetime (use the same time as the original event)
     let original_time = existing_event.dtstart.time();
@@ -906,12 +1136,21 @@ async fn delete_single_occurrence(
     let mut updated_event = existing_event;
     updated_event.exdate.push(exception_utc);
 
-    println!("🗑️ Added EXDATE for single occurrence deletion: {}", exception_utc.format("%Y%m%dT%H%M%SZ"));
+    println!(
+        "🗑️ Added EXDATE for single occurrence deletion: {}",
+        exception_utc.format("%Y%m%dT%H%M%SZ")
+    );
 
     // Update the event on the CalDAV server
-    client.update_event(&request.calendar_path, &updated_event, &request.event_href)
+    client
+        .update_event(&request.calendar_path, &updated_event, &request.event_href)
         .await
-        .map_err(|e| ApiError::Internal(format!("Failed to update event series for single deletion: {}", e)))?;
+        .map_err(|e| {
+            ApiError::Internal(format!(
+                "Failed to update event series for single deletion: {}",
+                e
+            ))
+        })?;
 
     Ok(1) // 1 occurrence excluded
 }

backend/src/lib.rs

@@ -3,33 +3,43 @@ use axum::{
     routing::{get, post},
     Router,
 };
-use tower_http::cors::{CorsLayer, Any};
 use std::sync::Arc;
+use tower_http::cors::{Any, CorsLayer};
 
 pub mod auth;
-pub mod models;
-pub mod handlers;
 pub mod calendar;
 pub mod config;
+pub mod db;
+pub mod handlers;
+pub mod models;
 
 use auth::AuthService;
+use db::Database;
 
 #[derive(Clone)]
 pub struct AppState {
     pub auth_service: AuthService,
+    pub db: Database,
 }
 
 pub async fn run_server() -> Result<(), Box<dyn std::error::Error>> {
     // Initialize logging
     println!("🚀 Starting Calendar Backend Server");
 
+    // Initialize database
+    let database_url = std::env::var("DATABASE_URL")
+        .unwrap_or_else(|_| "sqlite:calendar.db".to_string());
+    
+    let db = Database::new(&database_url).await?;
+    println!("✅ Database initialized");
+
     // Create auth service
     let jwt_secret = std::env::var("JWT_SECRET")
         .unwrap_or_else(|_| "your-super-secret-jwt-key-change-in-production".to_string());
 
-    let auth_service = AuthService::new(jwt_secret);
+    let auth_service = AuthService::new(jwt_secret, db.clone());
 
-    let app_state = AppState { auth_service };
+    let app_state = AppState { auth_service, db };
 
     // Build our application with routes
     let app = Router::new()
@@ -46,9 +56,22 @@ pub async fn run_server() -> Result<(), Box<dyn std::error::Error>> {
         .route("/api/calendar/events/delete", post(handlers::delete_event))
         .route("/api/calendar/events/:uid", get(handlers::refresh_event))
         // Event series-specific endpoints
-        .route("/api/calendar/events/series/create", post(handlers::create_event_series))
+        .route(
-        .route("/api/calendar/events/series/update", post(handlers::update_event_series))
+            "/api/calendar/events/series/create",
-        .route("/api/calendar/events/series/delete", post(handlers::delete_event_series))
+            post(handlers::create_event_series),
+        )
+        .route(
+            "/api/calendar/events/series/update",
+            post(handlers::update_event_series),
+        )
+        .route(
+            "/api/calendar/events/series/delete",
+            post(handlers::delete_event_series),
+        )
+        // User preferences endpoints
+        .route("/api/preferences", get(handlers::get_preferences))
+        .route("/api/preferences", post(handlers::update_preferences))
+        .route("/api/auth/logout", post(handlers::logout))
         .layer(
             CorsLayer::new()
                 .allow_origin(Any)

backend/src/models.rs

@@ -16,8 +16,28 @@ pub struct CalDAVLoginRequest {
 #[derive(Debug, Serialize)]
 pub struct AuthResponse {
     pub token: String,
+    pub session_token: String,
     pub username: String,
     pub server_url: String,
+    pub preferences: UserPreferencesResponse,
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferencesResponse {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct UpdatePreferencesRequest {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -201,6 +221,7 @@ pub struct UpdateEventSeriesRequest {
     // Update scope control
     pub update_scope: String, // "this_only", "this_and_future", "all_in_series"
     pub occurrence_date: Option<String>, // ISO date string for specific occurrence being updated
+    pub changed_fields: Option<Vec<String>>, // List of field names that were changed (for optimization)
 }
 
 #[derive(Debug, Serialize)]

backend/tests/integration_tests.rs

@@ -1,16 +1,16 @@
-use calendar_backend::AppState;
-use calendar_backend::auth::AuthService;
-use reqwest::Client;
-use serde_json::json;
-use std::time::Duration;
-use tokio::time::sleep;
 use axum::{
     response::Json,
     routing::{get, post},
     Router,
 };
-use tower_http::cors::{CorsLayer, Any};
+use calendar_backend::auth::AuthService;
+use calendar_backend::AppState;
+use reqwest::Client;
+use serde_json::json;
 use std::sync::Arc;
+use std::time::Duration;
+use tokio::time::sleep;
+use tower_http::cors::{Any, CorsLayer};
 
 /// Test utilities for integration testing
 mod test_utils {
@@ -33,19 +33,55 @@ mod test_utils {
                 .route("/", get(root))
                 .route("/api/health", get(health_check))
                 .route("/api/auth/login", post(calendar_backend::handlers::login))
-                .route("/api/auth/verify", get(calendar_backend::handlers::verify_token))
+                .route(
-                .route("/api/user/info", get(calendar_backend::handlers::get_user_info))
+                    "/api/auth/verify",
-                .route("/api/calendar/create", post(calendar_backend::handlers::create_calendar))
+                    get(calendar_backend::handlers::verify_token),
-                .route("/api/calendar/delete", post(calendar_backend::handlers::delete_calendar))
+                )
-                .route("/api/calendar/events", get(calendar_backend::handlers::get_calendar_events))
+                .route(
-                .route("/api/calendar/events/create", post(calendar_backend::handlers::create_event))
+                    "/api/user/info",
-                .route("/api/calendar/events/update", post(calendar_backend::handlers::update_event))
+                    get(calendar_backend::handlers::get_user_info),
-                .route("/api/calendar/events/delete", post(calendar_backend::handlers::delete_event))
+                )
-                .route("/api/calendar/events/:uid", get(calendar_backend::handlers::refresh_event))
+                .route(
+                    "/api/calendar/create",
+                    post(calendar_backend::handlers::create_calendar),
+                )
+                .route(
+                    "/api/calendar/delete",
+                    post(calendar_backend::handlers::delete_calendar),
+                )
+                .route(
+                    "/api/calendar/events",
+                    get(calendar_backend::handlers::get_calendar_events),
+                )
+                .route(
+                    "/api/calendar/events/create",
+                    post(calendar_backend::handlers::create_event),
+                )
+                .route(
+                    "/api/calendar/events/update",
+                    post(calendar_backend::handlers::update_event),
+                )
+                .route(
+                    "/api/calendar/events/delete",
+                    post(calendar_backend::handlers::delete_event),
+                )
+                .route(
+                    "/api/calendar/events/:uid",
+                    get(calendar_backend::handlers::refresh_event),
+                )
                 // Event series-specific endpoints
-                .route("/api/calendar/events/series/create", post(calendar_backend::handlers::create_event_series))
+                .route(
-                .route("/api/calendar/events/series/update", post(calendar_backend::handlers::update_event_series))
+                    "/api/calendar/events/series/create",
-                .route("/api/calendar/events/series/delete", post(calendar_backend::handlers::delete_event_series))
+                    post(calendar_backend::handlers::create_event_series),
+                )
+                .route(
+                    "/api/calendar/events/series/update",
+                    post(calendar_backend::handlers::update_event_series),
+                )
+                .route(
+                    "/api/calendar/events/series/delete",
+                    post(calendar_backend::handlers::delete_event_series),
+                )
                 .layer(
                     CorsLayer::new()
                         .allow_origin(Any)
@@ -72,22 +108,30 @@ mod test_utils {
 
         pub async fn login(&self) -> String {
             let login_payload = json!({
-                "username": std::env::var("CALDAV_USERNAME").unwrap_or("test".to_string()),
+                "username": "test".to_string(),
-                "password": std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string()),
+                "password": "test".to_string(),
-                "server_url": std::env::var("CALDAV_SERVER_URL").unwrap_or("https://example.com".to_string())
+                "server_url": "https://example.com".to_string()
             });
 
-            let response = self.client
+            let response = self
+                .client
                 .post(&format!("{}/api/auth/login", self.base_url))
                 .json(&login_payload)
                 .send()
                 .await
                 .expect("Failed to send login request");
 
-            assert!(response.status().is_success(), "Login failed with status: {}", response.status());
+            assert!(
+                response.status().is_success(),
+                "Login failed with status: {}",
+                response.status()
+            );
 
             let login_response: serde_json::Value = response.json().await.unwrap();
-            login_response["token"].as_str().expect("Login response should contain token").to_string()
+            login_response["token"]
+                .as_str()
+                .expect("Login response should contain token")
+                .to_string()
         }
     }
 
@@ -106,15 +150,16 @@ mod test_utils {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use super::test_utils::*;
+    use super::*;
 
     /// Test the health endpoint
     #[tokio::test]
     async fn test_health_endpoint() {
         let server = TestServer::start().await;
 
-        let response = server.client
+        let response = server
+            .client
             .get(&format!("{}/api/health", server.base_url))
             .send()
             .await
@@ -134,12 +179,10 @@ mod tests {
     async fn test_auth_login() {
         let server = TestServer::start().await;
 
-        // Load credentials from .env 
+        // Use test credentials
-        dotenvy::dotenv().ok();
+        let username = "test".to_string();
-        let username = std::env::var("CALDAV_USERNAME").unwrap_or("test".to_string());
+        let password = "test".to_string();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let server_url = "https://example.com".to_string();
-        
-        let server_url = std::env::var("CALDAV_SERVER_URL").unwrap_or("https://example.com".to_string());
 
         let login_payload = json!({
             "username": username,
@@ -147,18 +190,29 @@ mod tests {
             "server_url": server_url
         });
 
-        let response = server.client
+        let response = server
+            .client
             .post(&format!("{}/api/auth/login", server.base_url))
             .json(&login_payload)
             .send()
             .await
             .unwrap();
 
-        assert!(response.status().is_success(), "Login failed with status: {}", response.status());
+        assert!(
+            response.status().is_success(),
+            "Login failed with status: {}",
+            response.status()
+        );
 
         let login_response: serde_json::Value = response.json().await.unwrap();
-        assert!(login_response["token"].is_string(), "Login response should contain a token");
+        assert!(
-        assert!(login_response["username"].is_string(), "Login response should contain username");
+            login_response["token"].is_string(),
+            "Login response should contain a token"
+        );
+        assert!(
+            login_response["username"].is_string(),
+            "Login response should contain username"
+        );
 
         println!("✓ Authentication login test passed");
     }
@@ -171,7 +225,8 @@ mod tests {
         // First login to get a token
         let token = server.login().await;
 
-        let response = server.client
+        let response = server
+            .client
             .get(&format!("{}/api/auth/verify", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .send()
@@ -196,9 +251,10 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
-        let response = server.client
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
@@ -212,7 +268,10 @@ mod tests {
             assert!(user_info["username"].is_string());
             println!("✓ User info test passed");
         } else {
-            println!("⚠ User info test skipped (CalDAV server issues): {}", response.status());
+            println!(
+                "⚠ User info test skipped (CalDAV server issues): {}",
+                response.status()
+            );
         }
     }
 
@@ -226,22 +285,33 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
-        let response = server.client
+        let response = server
-            .get(&format!("{}/api/calendar/events?year=2024&month=12", server.base_url))
+            .client
+            .get(&format!(
+                "{}/api/calendar/events?year=2024&month=12",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .send()
             .await
             .unwrap();
 
-        assert!(response.status().is_success(), "Get events failed with status: {}", response.status());
+        assert!(
+            response.status().is_success(),
+            "Get events failed with status: {}",
+            response.status()
+        );
 
         let events: serde_json::Value = response.json().await.unwrap();
         assert!(events.is_array());
 
-        println!("✓ Get calendar events test passed (found {} events)", events.as_array().unwrap().len());
+        println!(
+            "✓ Get calendar events test passed (found {} events)",
+            events.as_array().unwrap().len()
+        );
     }
 
     /// Test event creation endpoint
@@ -254,7 +324,7 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
         let create_payload = json!({
             "title": "Integration Test Event",
@@ -276,7 +346,8 @@ mod tests {
             "recurrence_days": [false, false, false, false, false, false, false]
         });
 
-        let response = server.client
+        let response = server
+            .client
             .post(&format!("{}/api/calendar/events/create", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
@@ -308,13 +379,17 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
         // Use a dummy UID for testing - this will likely return 404 but we're testing the endpoint structure
         let test_uid = "test-event-uid";
 
-        let response = server.client
+        let response = server
-            .get(&format!("{}/api/calendar/events/{}", server.base_url, test_uid))
+            .client
+            .get(&format!(
+                "{}/api/calendar/events/{}",
+                server.base_url, test_uid
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .send()
@@ -322,8 +397,11 @@ mod tests {
             .unwrap();
 
         // We expect either 200 (if event exists) or 404 (if not found) - both are valid responses
-        assert!(response.status() == 200 || response.status() == 404, 
+        assert!(
-               "Refresh event failed with unexpected status: {}", response.status());
+            response.status() == 200 || response.status() == 404,
+            "Refresh event failed with unexpected status: {}",
+            response.status()
+        );
 
         println!("✓ Refresh event endpoint test passed");
     }
@@ -333,7 +411,8 @@ mod tests {
     async fn test_invalid_auth() {
         let server = TestServer::start().await;
 
-        let response = server.client
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .header("Authorization", "Bearer invalid-token")
             .send()
@@ -341,8 +420,11 @@ mod tests {
             .unwrap();
 
         // Accept both 400 and 401 as valid responses for invalid tokens
-        assert!(response.status() == 401 || response.status() == 400, 
+        assert!(
-               "Expected 401 or 400 for invalid token, got {}", response.status());
+            response.status() == 401 || response.status() == 400,
+            "Expected 401 or 400 for invalid token, got {}",
+            response.status()
+        );
         println!("✓ Invalid authentication test passed");
     }
 
@@ -351,7 +433,8 @@ mod tests {
     async fn test_missing_auth() {
         let server = TestServer::start().await;
 
-        let response = server.client
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .send()
             .await
@@ -373,7 +456,7 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
         let create_payload = json!({
             "title": "Integration Test Series",
@@ -398,8 +481,12 @@ mod tests {
             "calendar_path": "/calendars/test/default/" // Provide explicit path to bypass discovery
         });
 
-        let response = server.client
+        let response = server
-            .post(&format!("{}/api/calendar/events/series/create", server.base_url))
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/create",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&create_payload)
@@ -431,7 +518,7 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
         let update_payload = json!({
             "series_uid": "test-series-uid",
@@ -458,8 +545,12 @@ mod tests {
             "calendar_path": "/calendars/test/default/" // Provide explicit path to bypass discovery
         });
 
-        let response = server.client
+        let response = server
-            .post(&format!("{}/api/calendar/events/series/update", server.base_url))
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/update",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&update_payload)
@@ -474,10 +565,15 @@ mod tests {
         if status.is_success() {
             let update_response: serde_json::Value = response.json().await.unwrap();
             assert!(update_response["success"].as_bool().unwrap_or(false));
-            assert_eq!(update_response["series_uid"].as_str().unwrap(), "test-series-uid");
+            assert_eq!(
+                update_response["series_uid"].as_str().unwrap(),
+                "test-series-uid"
+            );
             println!("✓ Update event series test passed");
         } else if status == 404 {
-            println!("⚠ Update event series test skipped (event not found - expected for test data)");
+            println!(
+                "⚠ Update event series test skipped (event not found - expected for test data)"
+            );
         } else {
             println!("⚠ Update event series test skipped (CalDAV server not accessible)");
         }
@@ -493,7 +589,7 @@ mod tests {
 
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
+        let password = "test".to_string();
 
         let delete_payload = json!({
             "series_uid": "test-series-to-delete",
@@ -502,8 +598,12 @@ mod tests {
             "delete_scope": "all_in_series"
         });
 
-        let response = server.client
+        let response = server
-            .post(&format!("{}/api/calendar/events/series/delete", server.base_url))
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/delete",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&delete_payload)
@@ -520,7 +620,9 @@ mod tests {
             assert!(delete_response["success"].as_bool().unwrap_or(false));
             println!("✓ Delete event series test passed");
         } else if status == 404 {
-            println!("⚠ Delete event series test skipped (event not found - expected for test data)");
+            println!(
+                "⚠ Delete event series test skipped (event not found - expected for test data)"
+            );
         } else {
             println!("⚠ Delete event series test skipped (CalDAV server not accessible)");
         }
@@ -555,15 +657,23 @@ mod tests {
             "update_scope": "invalid_scope" // This should cause a 400 error
         });
 
-        let response = server.client
+        let response = server
-            .post(&format!("{}/api/calendar/events/series/update", server.base_url))
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/update",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .json(&invalid_payload)
             .send()
             .await
             .unwrap();
 
-        assert_eq!(response.status(), 400, "Expected 400 for invalid update scope");
+        assert_eq!(
+            response.status(),
+            400,
+            "Expected 400 for invalid update scope"
+        );
         println!("✓ Invalid update scope test passed");
     }
 
@@ -594,15 +704,23 @@ mod tests {
             "recurrence_days": [false, false, false, false, false, false, false]
         });
 
-        let response = server.client
+        let response = server
-            .post(&format!("{}/api/calendar/events/series/create", server.base_url))
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/create",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .json(&non_recurring_payload)
             .send()
             .await
             .unwrap();
 
-        assert_eq!(response.status(), 400, "Expected 400 for non-recurring event in series endpoint");
+        assert_eq!(
+            response.status(),
+            400,
+            "Expected 400 for non-recurring event in series endpoint"
+        );
         println!("✓ Non-recurring series rejection test passed");
     }
 }

calendar-models/src/common.rs

@@ -1,6 +1,6 @@
 //! Common types and enums used across calendar components
 
-use chrono::{DateTime, Utc, Duration};
+use chrono::{DateTime, Duration, Utc};
 use serde::{Deserialize, Serialize};
 
 // ==================== ENUMS AND COMMON TYPES ====================

calendar-models/src/lib.rs

@@ -3,8 +3,8 @@
 //! This crate provides shared data structures for calendar applications
 //! that comply with RFC 5545 (iCalendar) specification.
 
-pub mod vevent;
 pub mod common;
+pub mod vevent;
 
-pub use vevent::*;
 pub use common::*;
+pub use vevent::*;

calendar-models/src/vevent.rs

@@ -1,8 +1,8 @@
 //! VEvent - RFC 5545 compliant calendar event structure
 
-use chrono::{DateTime, Utc, Duration};
-use serde::{Deserialize, Serialize};
 use crate::common::*;
+use chrono::{DateTime, Duration, Utc};
+use serde::{Deserialize, Serialize};
 
 // ==================== VEVENT COMPONENT ====================
 
@@ -129,7 +129,9 @@ impl VEvent {
 
     /// Helper method to get display title (summary or "Untitled Event")
     pub fn get_title(&self) -> String {
-        self.summary.clone().unwrap_or_else(|| "Untitled Event".to_string())
+        self.summary
+            .clone()
+            .unwrap_or_else(|| "Untitled Event".to_string())
     }
 
     /// Helper method to get start date for UI compatibility

frontend/src/app.rs

@@ -1,11 +1,15 @@
-use yew::prelude::*;
+use crate::components::{
-use yew_router::prelude::*;
+    CalendarContextMenu, ContextMenu, CreateCalendarModal, CreateEventModal, DeleteAction,
+    EditAction, EventClass, EventContextMenu, EventCreationData, EventStatus, RecurrenceType,
+    ReminderType, RouteHandler, Sidebar, Theme, ViewMode,
+};
+use crate::models::ical::VEvent;
+use crate::services::{calendar_service::UserInfo, CalendarService};
+use chrono::NaiveDate;
 use gloo_storage::{LocalStorage, Storage};
 use web_sys::MouseEvent;
-use crate::components::{Sidebar, ViewMode, Theme, CreateCalendarModal, ContextMenu, EventContextMenu, CalendarContextMenu, CreateEventModal, EventCreationData, RouteHandler, EventStatus, EventClass, ReminderType, RecurrenceType, DeleteAction};
+use yew::prelude::*;
-use crate::services::{CalendarService, calendar_service::UserInfo};
+use yew_router::prelude::*;
-use crate::models::ical::VEvent;
-use chrono::NaiveDate;
 
 fn get_theme_event_colors() -> Vec<String> {
     if let Some(window) = web_sys::window() {
@@ -27,18 +31,28 @@ fn get_theme_event_colors() -> Vec<String> {
     }
 
     vec![
-        "#3B82F6".to_string(), "#10B981".to_string(), "#F59E0B".to_string(), "#EF4444".to_string(), 
+        "#3B82F6".to_string(),
-        "#8B5CF6".to_string(), "#06B6D4".to_string(), "#84CC16".to_string(), "#F97316".to_string(),
+        "#10B981".to_string(),
-        "#EC4899".to_string(), "#6366F1".to_string(), "#14B8A6".to_string(), "#F3B806".to_string(),
+        "#F59E0B".to_string(),
-        "#8B5A2B".to_string(), "#6B7280".to_string(), "#DC2626".to_string(), "#7C3AED".to_string()
+        "#EF4444".to_string(),
+        "#8B5CF6".to_string(),
+        "#06B6D4".to_string(),
+        "#84CC16".to_string(),
+        "#F97316".to_string(),
+        "#EC4899".to_string(),
+        "#6366F1".to_string(),
+        "#14B8A6".to_string(),
+        "#F3B806".to_string(),
+        "#8B5A2B".to_string(),
+        "#6B7280".to_string(),
+        "#DC2626".to_string(),
+        "#7C3AED".to_string(),
     ]
 }
 
 #[function_component]
 pub fn App() -> Html {
-    let auth_token = use_state(|| -> Option<String> {
+    let auth_token = use_state(|| -> Option<String> { LocalStorage::get("auth_token").ok() });
-        LocalStorage::get("auth_token").ok()
-    });
 
     let user_info = use_state(|| -> Option<UserInfo> { None });
     let color_picker_open = use_state(|| -> Option<String> { None });
@@ -54,6 +68,7 @@ pub fn App() -> Html {
     let calendar_context_menu_date = use_state(|| -> Option<NaiveDate> { None });
     let create_event_modal_open = use_state(|| false);
     let selected_date_for_event = use_state(|| -> Option<NaiveDate> { None });
+    let event_edit_scope = use_state(|| -> Option<EditAction> { None });
     let _recurring_edit_modal_open = use_state(|| false);
     let _recurring_edit_event = use_state(|| -> Option<VEvent> { None });
     let _recurring_edit_data = use_state(|| -> Option<EventCreationData> { None });
@@ -163,8 +178,12 @@ pub fn App() -> Html {
                 wasm_bindgen_futures::spawn_local(async move {
                     let calendar_service = CalendarService::new();
 
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
+                    let password = if let Ok(credentials_str) =
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
                             credentials["password"].as_str().unwrap_or("").to_string()
                         } else {
                             String::new()
@@ -176,8 +195,12 @@ pub fn App() -> Html {
                     if !password.is_empty() {
                         match calendar_service.fetch_user_info(&token, &password).await {
                             Ok(mut info) => {
-                                if let Ok(saved_colors_json) = LocalStorage::get::<String>("calendar_colors") {
+                                if let Ok(saved_colors_json) =
-                                    if let Ok(saved_info) = serde_json::from_str::<UserInfo>(&saved_colors_json) {
+                                    LocalStorage::get::<String>("calendar_colors")
+                                {
+                                    if let Ok(saved_info) =
+                                        serde_json::from_str::<UserInfo>(&saved_colors_json)
+                                    {
                                         for saved_cal in &saved_info.calendars {
                                             for cal in &mut info.calendars {
                                                 if cal.path == saved_cal.path {
@@ -190,7 +213,9 @@ pub fn App() -> Html {
                                 user_info.set(Some(info));
                             }
                             Err(err) => {
-                                web_sys::console::log_1(&format!("Failed to fetch user info: {}", err).into());
+                                web_sys::console::log_1(
+                                    &format!("Failed to fetch user info: {}", err).into(),
+                                );
                             }
                         }
                     }
@@ -210,10 +235,10 @@ pub fn App() -> Html {
         let calendar_context_menu_open = calendar_context_menu_open.clone();
         Callback::from(move |e: MouseEvent| {
             // Check if any context menu or color picker is open
-            let any_menu_open = color_picker_open.is_some() || 
+            let any_menu_open = color_picker_open.is_some()
-                               *context_menu_open || 
+                || *context_menu_open
-                               *event_context_menu_open || 
+                || *event_context_menu_open
-                               *calendar_context_menu_open;
+                || *calendar_context_menu_open;
 
             if any_menu_open {
                 // Prevent the default action and stop event propagation
@@ -230,10 +255,10 @@ pub fn App() -> Html {
     };
 
     // Compute if any context menu is open
-    let any_context_menu_open = color_picker_open.is_some() || 
+    let any_context_menu_open = color_picker_open.is_some()
-                               *context_menu_open || 
+        || *context_menu_open
-                               *event_context_menu_open || 
+        || *event_context_menu_open
-                               *calendar_context_menu_open;
+        || *calendar_context_menu_open;
 
     let on_color_change = {
         let user_info = user_info.clone();
@@ -322,8 +347,12 @@ pub fn App() -> Html {
                     let _calendar_service = CalendarService::new();
 
                     // Get CalDAV password from storage
-                    let _password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
+                    let _password = if let Ok(credentials_str) =
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
                             credentials["password"].as_str().unwrap_or("").to_string()
                         } else {
                             String::new()
@@ -333,10 +362,9 @@ pub fn App() -> Html {
                     };
 
                     let params = event_data.to_create_event_params();
-                    let create_result = _calendar_service.create_event(
+                    let create_result = _calendar_service
-                        &_token,
+                        .create_event(
-                        &_password,
+                            &_token, &_password, params.0,  // title
-                        params.0,  // title
                             params.1,  // description
                             params.2,  // start_date
                             params.3,  // start_time
@@ -353,8 +381,9 @@ pub fn App() -> Html {
                             params.14, // reminder
                             params.15, // recurrence
                             params.16, // recurrence_days
-                        params.17  // calendar_path
+                            params.17, // calendar_path
-                    ).await;
+                        )
+                        .await;
                     match create_result {
                         Ok(_) => {
                             web_sys::console::log_1(&"Event created successfully".into());
@@ -363,8 +392,13 @@ pub fn App() -> Html {
                             web_sys::window().unwrap().location().reload().unwrap();
                         }
                         Err(err) => {
-                            web_sys::console::error_1(&format!("Failed to create event: {}", err).into());
+                            web_sys::console::error_1(
-                            web_sys::window().unwrap().alert_with_message(&format!("Failed to create event: {}", err)).unwrap();
+                                &format!("Failed to create event: {}", err).into(),
+                            );
+                            web_sys::window()
+                                .unwrap()
+                                .alert_with_message(&format!("Failed to create event: {}", err))
+                                .unwrap();
                         }
                     }
                 });
@@ -374,11 +408,33 @@ pub fn App() -> Html {
 
     let on_event_update = {
         let auth_token = auth_token.clone();
-        Callback::from(move |(original_event, new_start, new_end, preserve_rrule, until_date, update_scope, occurrence_date): (VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)| {
+        Callback::from(
-            web_sys::console::log_1(&format!("Updating event: {} to new times: {} - {}", 
+            move |(
+                original_event,
+                new_start,
+                new_end,
+                preserve_rrule,
+                until_date,
+                update_scope,
+                occurrence_date,
+            ): (
+                VEvent,
+                chrono::NaiveDateTime,
+                chrono::NaiveDateTime,
+                bool,
+                Option<chrono::DateTime<chrono::Utc>>,
+                Option<String>,
+                Option<String>,
+            )| {
+                web_sys::console::log_1(
+                    &format!(
+                        "Updating event: {} to new times: {} - {}",
                         original_event.uid,
                         new_start.format("%Y-%m-%d %H:%M"),
-                new_end.format("%Y-%m-%d %H:%M")).into());
+                        new_end.format("%Y-%m-%d %H:%M")
+                    )
+                    .into(),
+                );
 
                 // Use the original UID for all updates
                 let backend_uid = original_event.uid.clone();
@@ -390,8 +446,12 @@ pub fn App() -> Html {
                         let calendar_service = CalendarService::new();
 
                         // Get CalDAV password from storage
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
+                        let password = if let Ok(credentials_str) =
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
+                            LocalStorage::get::<String>("caldav_credentials")
+                        {
+                            if let Ok(credentials) =
+                                serde_json::from_str::<serde_json::Value>(&credentials_str)
+                            {
                                 credentials["password"].as_str().unwrap_or("").to_string()
                             } else {
                                 String::new()
@@ -401,7 +461,10 @@ pub fn App() -> Html {
                         };
 
                         // Convert local times to UTC for backend storage
-                    let start_utc = new_start.and_local_timezone(chrono::Local).unwrap().to_utc();
+                        let start_utc = new_start
+                            .and_local_timezone(chrono::Local)
+                            .unwrap()
+                            .to_utc();
                         let end_utc = new_end.and_local_timezone(chrono::Local).unwrap().to_utc();
 
                         // Format UTC date and time strings for backend
@@ -412,16 +475,24 @@ pub fn App() -> Html {
 
                         // Convert existing event data to string formats for the API
                         let status_str = match original_event.status {
-                        Some(crate::models::ical::EventStatus::Tentative) => "TENTATIVE".to_string(),
+                            Some(crate::models::ical::EventStatus::Tentative) => {
-                        Some(crate::models::ical::EventStatus::Confirmed) => "CONFIRMED".to_string(),
+                                "TENTATIVE".to_string()
-                        Some(crate::models::ical::EventStatus::Cancelled) => "CANCELLED".to_string(),
+                            }
+                            Some(crate::models::ical::EventStatus::Confirmed) => {
+                                "CONFIRMED".to_string()
+                            }
+                            Some(crate::models::ical::EventStatus::Cancelled) => {
+                                "CANCELLED".to_string()
+                            }
                             None => "CONFIRMED".to_string(), // Default status
                         };
 
                         let class_str = match original_event.class {
                             Some(crate::models::ical::EventClass::Public) => "PUBLIC".to_string(),
                             Some(crate::models::ical::EventClass::Private) => "PRIVATE".to_string(),
-                        Some(crate::models::ical::EventClass::Confidential) => "CONFIDENTIAL".to_string(),
+                            Some(crate::models::ical::EventClass::Confidential) => {
+                                "CONFIDENTIAL".to_string()
+                            }
                             None => "PUBLIC".to_string(), // Default class
                         };
 
@@ -438,7 +509,8 @@ pub fn App() -> Html {
                         let recurrence_days = vec![false; 7]; // Default - could be enhanced to parse existing recurrence
 
                         // Determine if this is a recurring event that needs series endpoint
-                    let has_recurrence = !recurrence_str.is_empty() && recurrence_str.to_uppercase() != "NONE";
+                        let has_recurrence =
+                            !recurrence_str.is_empty() && recurrence_str.to_uppercase() != "NONE";
 
                         let result = if let Some(scope) = update_scope.as_ref() {
                             // Use series endpoint for recurring event operations
@@ -447,7 +519,9 @@ pub fn App() -> Html {
                                 // Fall through to regular endpoint
                                 None
                             } else {
-                            Some(calendar_service.update_series(
+                                Some(
+                                    calendar_service
+                                        .update_series(
                                             &token,
                                             &password,
                                             backend_uid.clone(),
@@ -462,15 +536,26 @@ pub fn App() -> Html {
                                             status_str.clone(),
                                             class_str.clone(),
                                             original_event.priority,
-                                original_event.organizer.as_ref().map(|o| o.cal_address.clone()).unwrap_or_default(),
+                                            original_event
-                                original_event.attendees.iter().map(|a| a.cal_address.clone()).collect::<Vec<_>>().join(","),
+                                                .organizer
+                                                .as_ref()
+                                                .map(|o| o.cal_address.clone())
+                                                .unwrap_or_default(),
+                                            original_event
+                                                .attendees
+                                                .iter()
+                                                .map(|a| a.cal_address.clone())
+                                                .collect::<Vec<_>>()
+                                                .join(","),
                                             original_event.categories.join(","),
                                             reminder_str.clone(),
                                             recurrence_str.clone(),
                                             original_event.calendar_path.clone(),
                                             scope.clone(),
                                             occurrence_date,
-                            ).await)
+                                        )
+                                        .await,
+                                )
                             }
                         } else {
                             None
@@ -480,7 +565,8 @@ pub fn App() -> Html {
                             series_result
                         } else {
                             // Use regular endpoint
-                        calendar_service.update_event(
+                            calendar_service
+                                .update_event(
                                     &token,
                                     &password,
                                     backend_uid,
@@ -495,8 +581,17 @@ pub fn App() -> Html {
                                     status_str,
                                     class_str,
                                     original_event.priority,
-                            original_event.organizer.as_ref().map(|o| o.cal_address.clone()).unwrap_or_default(),
+                                    original_event
-                            original_event.attendees.iter().map(|a| a.cal_address.clone()).collect::<Vec<_>>().join(","),
+                                        .organizer
+                                        .as_ref()
+                                        .map(|o| o.cal_address.clone())
+                                        .unwrap_or_default(),
+                                    original_event
+                                        .attendees
+                                        .iter()
+                                        .map(|a| a.cal_address.clone())
+                                        .collect::<Vec<_>>()
+                                        .join(","),
                                     original_event.categories.join(","),
                                     reminder_str,
                                     recurrence_str,
@@ -508,8 +603,9 @@ pub fn App() -> Html {
                                     } else {
                                         Some("this_and_future".to_string())
                                     },
-                            until_date
+                                    until_date,
-                        ).await
+                                )
+                                .await
                         };
 
                         match result {
@@ -517,18 +613,27 @@ pub fn App() -> Html {
                                 web_sys::console::log_1(&"Event updated successfully".into());
                                 // Add small delay before reload to let any pending requests complete
                                 wasm_bindgen_futures::spawn_local(async {
-                                gloo_timers::future::sleep(std::time::Duration::from_millis(100)).await;
+                                    gloo_timers::future::sleep(std::time::Duration::from_millis(
+                                        100,
+                                    ))
+                                    .await;
                                     web_sys::window().unwrap().location().reload().unwrap();
                                 });
                             }
                             Err(err) => {
-                            web_sys::console::error_1(&format!("Failed to update event: {}", err).into());
+                                web_sys::console::error_1(
-                            web_sys::window().unwrap().alert_with_message(&format!("Failed to update event: {}", err)).unwrap();
+                                    &format!("Failed to update event: {}", err).into(),
+                                );
+                                web_sys::window()
+                                    .unwrap()
+                                    .alert_with_message(&format!("Failed to update event: {}", err))
+                                    .unwrap();
                             }
                         }
                     });
                 }
-        })
+            },
+        )
     };
 
     let refresh_calendars = {
@@ -541,8 +646,12 @@ pub fn App() -> Html {
                 wasm_bindgen_futures::spawn_local(async move {
                     let calendar_service = CalendarService::new();
 
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
+                    let password = if let Ok(credentials_str) =
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
                             credentials["password"].as_str().unwrap_or("").to_string()
                         } else {
                             String::new()
@@ -553,8 +662,12 @@ pub fn App() -> Html {
 
                     match calendar_service.fetch_user_info(&token, &password).await {
                         Ok(mut info) => {
-                            if let Ok(saved_colors_json) = LocalStorage::get::<String>("calendar_colors") {
+                            if let Ok(saved_colors_json) =
-                                if let Ok(saved_info) = serde_json::from_str::<UserInfo>(&saved_colors_json) {
+                                LocalStorage::get::<String>("calendar_colors")
+                            {
+                                if let Ok(saved_info) =
+                                    serde_json::from_str::<UserInfo>(&saved_colors_json)
+                                {
                                     for saved_cal in &saved_info.calendars {
                                         for cal in &mut info.calendars {
                                             if cal.path == saved_cal.path {
@@ -567,7 +680,9 @@ pub fn App() -> Html {
                             user_info.set(Some(info));
                         }
                         Err(err) => {
-                            web_sys::console::log_1(&format!("Failed to refresh calendars: {}", err).into());
+                            web_sys::console::log_1(
+                                &format!("Failed to refresh calendars: {}", err).into(),
+                            );
                         }
                     }
                 });
@@ -576,7 +691,9 @@ pub fn App() -> Html {
     };
 
     // Debug logging
-    web_sys::console::log_1(&format!("App rendering: auth_token = {:?}", auth_token.is_some()).into());
+    web_sys::console::log_1(
+        &format!("App rendering: auth_token = {:?}", auth_token.is_some()).into(),
+    );
 
     html! {
         <BrowserRouter>
@@ -738,8 +855,10 @@ pub fn App() -> Html {
                         let _event_context_menu_event = event_context_menu_event.clone();
                         let event_context_menu_open = event_context_menu_open.clone();
                         let create_event_modal_open = create_event_modal_open.clone();
-                        move |_| {
+                        let event_edit_scope = event_edit_scope.clone();
-                            // Close the context menu and open the edit modal
+                        move |edit_action: EditAction| {
+                            // Set the edit scope and close the context menu
+                            event_edit_scope.set(Some(edit_action));
                             event_context_menu_open.set(false);
                             create_event_modal_open.set(true);
                         }
@@ -840,13 +959,16 @@ pub fn App() -> Html {
                     is_open={*create_event_modal_open}
                     selected_date={(*selected_date_for_event).clone()}
                     event_to_edit={(*event_context_menu_event).clone()}
+                    edit_scope={(*event_edit_scope).clone()}
                     on_close={Callback::from({
                         let create_event_modal_open = create_event_modal_open.clone();
                         let event_context_menu_event = event_context_menu_event.clone();
+                        let event_edit_scope = event_edit_scope.clone();
                         move |_| {
                             create_event_modal_open.set(false);
-                            // Clear the event being edited
+                            // Clear the event being edited and edit scope
                             event_context_menu_event.set(None);
+                            event_edit_scope.set(None);
                         }
                     })}
                     on_create={on_event_create}
@@ -854,10 +976,12 @@ pub fn App() -> Html {
                         let auth_token = auth_token.clone();
                         let create_event_modal_open = create_event_modal_open.clone();
                         let event_context_menu_event = event_context_menu_event.clone();
+                        let event_edit_scope = event_edit_scope.clone();
                         move |(original_event, updated_data): (VEvent, EventCreationData)| {
-                            web_sys::console::log_1(&format!("Updating event: {:?}", updated_data).into());
+                            web_sys::console::log_1(&format!("Updating event: {:?}, edit_scope: {:?}", updated_data, updated_data.edit_scope).into());
                             create_event_modal_open.set(false);
                             event_context_menu_event.set(None);
+                            event_edit_scope.set(None);
 
                             if let Some(token) = (*auth_token).clone() {
                                 wasm_bindgen_futures::spawn_local(async move {
@@ -988,7 +1112,60 @@ pub fn App() -> Html {
                                             web_sys::window().unwrap().alert_with_message("Cannot move event - original event missing calendar path").unwrap();
                                         }
                                     } else {
-                                        // Calendar hasn't changed - normal update
+                                        // Calendar hasn't changed - check if we should use series endpoint
+                                        let use_series_endpoint = updated_data.edit_scope.is_some() && original_event.rrule.is_some();
+
+                                        if use_series_endpoint {
+                                            // Use series endpoint for recurring event modal edits
+                                            let update_scope = match updated_data.edit_scope.as_ref().unwrap() {
+                                                EditAction::EditThis => "this_only",
+                                                EditAction::EditFuture => "this_and_future",
+                                                EditAction::EditAll => "all_in_series",
+                                            };
+
+                                            // For single occurrence edits, we need the occurrence date
+                                            let occurrence_date = if update_scope == "this_only" || update_scope == "this_and_future" {
+                                                // Use the original event's start date as the occurrence date
+                                                Some(original_event.dtstart.format("%Y-%m-%d").to_string())
+                                            } else {
+                                                None
+                                            };
+
+                                            match calendar_service.update_series(
+                                                &token,
+                                                &password,
+                                                original_event.uid,
+                                                updated_data.title,
+                                                updated_data.description,
+                                                start_date,
+                                                start_time,
+                                                end_date,
+                                                end_time,
+                                                updated_data.location,
+                                                updated_data.all_day,
+                                                status_str,
+                                                class_str,
+                                                updated_data.priority,
+                                                updated_data.organizer,
+                                                updated_data.attendees,
+                                                updated_data.categories,
+                                                reminder_str,
+                                                recurrence_str,
+                                                updated_data.selected_calendar,
+                                                update_scope.to_string(),
+                                                occurrence_date,
+                                            ).await {
+                                                Ok(_) => {
+                                                    web_sys::console::log_1(&"Series updated successfully".into());
+                                                    web_sys::window().unwrap().location().reload().unwrap();
+                                                }
+                                                Err(err) => {
+                                                    web_sys::console::error_1(&format!("Failed to update series: {}", err).into());
+                                                    web_sys::window().unwrap().alert_with_message(&format!("Failed to update series: {}", err)).unwrap();
+                                                }
+                                            }
+                                        } else {
+                                            // Use regular event endpoint for non-recurring events or legacy updates
                                             match calendar_service.update_event(
                                             &token,
                                             &password,
@@ -1026,6 +1203,7 @@ pub fn App() -> Html {
                                             }
                                         }
                                         }
+                                    }
                                 });
                             }
                         }

frontend/src/auth.rs

@@ -11,11 +11,22 @@ pub struct CalDAVLoginRequest {
     pub password: String,
 }
 
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferencesResponse {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct AuthResponse {
     pub token: String,
+    pub session_token: String,
     pub username: String,
     pub server_url: String,
+    pub preferences: UserPreferencesResponse,
 }
 
 #[derive(Debug, Deserialize)]
@@ -50,8 +61,8 @@ impl AuthService {
     ) -> Result<R, String> {
         let window = web_sys::window().ok_or("No global window exists")?;
 
-        let json_body = serde_json::to_string(body)
+        let json_body =
-            .map_err(|e| format!("JSON serialization failed: {}", e))?;
+            serde_json::to_string(body).map_err(|e| format!("JSON serialization failed: {}", e))?;
 
         let opts = RequestInit::new();
         opts.set_method("POST");
@@ -62,23 +73,27 @@ impl AuthService {
         let request = Request::new_with_str_and_init(&url, &opts)
             .map_err(|e| format!("Request creation failed: {:?}", e))?;
 
-        request.headers().set("Content-Type", "application/json")
+        request
+            .headers()
+            .set("Content-Type", "application/json")
             .map_err(|e| format!("Header setting failed: {:?}", e))?;
 
         let resp_value = JsFuture::from(window.fetch_with_request(&request))
             .await
             .map_err(|e| format!("Network request failed: {:?}", e))?;
 
-        let resp: Response = resp_value.dyn_into()
+        let resp: Response = resp_value
+            .dyn_into()
             .map_err(|e| format!("Response cast failed: {:?}", e))?;
 
-        let text = JsFuture::from(resp.text()
+        let text = JsFuture::from(
-            .map_err(|e| format!("Text extraction failed: {:?}", e))?)
+            resp.text()
+                .map_err(|e| format!("Text extraction failed: {:?}", e))?,
+        )
         .await
         .map_err(|e| format!("Text promise failed: {:?}", e))?;
 
-        let text_string = text.as_string()
+        let text_string = text.as_string().ok_or("Response text is not a string")?;
-            .ok_or("Response text is not a string")?;
 
         if resp.ok() {
             serde_json::from_str::<R>(&text_string)

frontend/src/components/calendar.rs

@@ -1,19 +1,16 @@
-use yew::prelude::*;
+use crate::components::{
-use chrono::{Datelike, Local, NaiveDate, Duration};
+    CalendarHeader, CreateEventModal, EventCreationData, EventModal, MonthView, ViewMode, WeekView,
+};
+use crate::models::ical::VEvent;
+use crate::services::{calendar_service::UserInfo, CalendarService};
+use chrono::{Datelike, Duration, Local, NaiveDate};
+use gloo_storage::{LocalStorage, Storage};
 use std::collections::HashMap;
 use web_sys::MouseEvent;
-use crate::services::calendar_service::UserInfo;
+use yew::prelude::*;
-use crate::models::ical::VEvent;
-use crate::components::{EventModal, ViewMode, CalendarHeader, MonthView, WeekView, CreateEventModal, EventCreationData};
-use gloo_storage::{LocalStorage, Storage};
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarProps {
-    #[prop_or_default]
-    pub events: HashMap<NaiveDate, Vec<VEvent>>,
-    pub on_event_click: Callback<VEvent>,
-    #[prop_or_default]
-    pub refreshing_event_uid: Option<String>,
     #[prop_or_default]
     pub user_info: Option<UserInfo>,
     #[prop_or_default]
@@ -25,7 +22,17 @@ pub struct CalendarProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
@@ -33,6 +40,12 @@ pub struct CalendarProps {
 #[function_component]
 pub fn Calendar(props: &CalendarProps) -> Html {
     let today = Local::now().date_naive();
+    
+    // Event management state
+    let events = use_state(|| HashMap::<NaiveDate, Vec<VEvent>>::new());
+    let loading = use_state(|| true);
+    let error = use_state(|| None::<String>);
+    let refreshing_event_uid = use_state(|| None::<String>);
     // Track the currently selected date (the actual day the user has selected)
     let selected_date = use_state(|| {
         // Try to load saved selected date from localStorage
@@ -57,17 +70,16 @@ pub fn Calendar(props: &CalendarProps) -> Html {
     });
 
     // Track the display date (what to show in the view)
-    let current_date = use_state(|| {
+    let current_date = use_state(|| match props.view {
-        match props.view {
         ViewMode::Month => selected_date.with_day(1).unwrap_or(*selected_date),
         ViewMode::Week => *selected_date,
-        }
     });
     let selected_event = use_state(|| None::<VEvent>);
 
     // State for create event modal
     let show_create_modal = use_state(|| false);
-    let create_event_data = use_state(|| None::<(chrono::NaiveDate, chrono::NaiveTime, chrono::NaiveTime)>);
+    let create_event_data =
+        use_state(|| None::<(chrono::NaiveDate, chrono::NaiveTime, chrono::NaiveTime)>);
 
     // State for time increment snapping (15 or 30 minutes)
     let time_increment = use_state(|| {
@@ -83,6 +95,154 @@ pub fn Calendar(props: &CalendarProps) -> Html {
         }
     });
 
+    // Fetch events when current_date changes
+    {
+        let events = events.clone();
+        let loading = loading.clone();
+        let error = error.clone();
+        let current_date = current_date.clone();
+        
+        use_effect_with((*current_date, props.view.clone()), move |(date, _view)| {
+            let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
+            let date = *date; // Clone the date to avoid lifetime issues
+            
+            if let Some(token) = auth_token {
+                let events = events.clone();
+                let loading = loading.clone();
+                let error = error.clone();
+                
+                wasm_bindgen_futures::spawn_local(async move {
+                    let calendar_service = CalendarService::new();
+
+                    let password = if let Ok(credentials_str) =
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
+                            credentials["password"].as_str().unwrap_or("").to_string()
+                        } else {
+                            String::new()
+                        }
+                    } else {
+                        String::new()
+                    };
+
+                    let current_year = date.year();
+                    let current_month = date.month();
+
+                    match calendar_service
+                        .fetch_events_for_month_vevent(
+                            &token,
+                            &password,
+                            current_year,
+                            current_month,
+                        )
+                        .await
+                    {
+                        Ok(vevents) => {
+                            let grouped_events = CalendarService::group_events_by_date(vevents);
+                            events.set(grouped_events);
+                            loading.set(false);
+                        }
+                        Err(err) => {
+                            error.set(Some(format!("Failed to load events: {}", err)));
+                            loading.set(false);
+                        }
+                    }
+                });
+            } else {
+                loading.set(false);
+                error.set(Some("No authentication token found".to_string()));
+            }
+
+            || ()
+        });
+    }
+
+    // Handle event click to refresh individual events
+    let on_event_click = {
+        let events = events.clone();
+        let refreshing_event_uid = refreshing_event_uid.clone();
+        
+        Callback::from(move |event: VEvent| {
+            let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
+            
+            if let Some(token) = auth_token {
+                let events = events.clone();
+                let refreshing_event_uid = refreshing_event_uid.clone();
+                let uid = event.uid.clone();
+
+                refreshing_event_uid.set(Some(uid.clone()));
+
+                wasm_bindgen_futures::spawn_local(async move {
+                    let calendar_service = CalendarService::new();
+
+                    let password = if let Ok(credentials_str) =
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
+                            credentials["password"].as_str().unwrap_or("").to_string()
+                        } else {
+                            String::new()
+                        }
+                    } else {
+                        String::new()
+                    };
+
+                    match calendar_service
+                        .refresh_event(&token, &password, &uid)
+                        .await
+                    {
+                        Ok(Some(refreshed_event)) => {
+                            let refreshed_vevent = refreshed_event;
+                            let mut updated_events = (*events).clone();
+
+                            for (_, day_events) in updated_events.iter_mut() {
+                                day_events.retain(|e| e.uid != uid);
+                            }
+
+                            if refreshed_vevent.rrule.is_some() {
+                                let new_occurrences =
+                                    CalendarService::expand_recurring_events(vec![
+                                        refreshed_vevent.clone(),
+                                    ]);
+
+                                for occurrence in new_occurrences {
+                                    let date = occurrence.get_date();
+                                    updated_events
+                                        .entry(date)
+                                        .or_insert_with(Vec::new)
+                                        .push(occurrence);
+                                }
+                            } else {
+                                let date = refreshed_vevent.get_date();
+                                updated_events
+                                    .entry(date)
+                                    .or_insert_with(Vec::new)
+                                    .push(refreshed_vevent);
+                            }
+
+                            events.set(updated_events);
+                        }
+                        Ok(None) => {
+                            let mut updated_events = (*events).clone();
+                            for (_, day_events) in updated_events.iter_mut() {
+                                day_events.retain(|e| e.uid != uid);
+                            }
+                            events.set(updated_events);
+                        }
+                        Err(_err) => {}
+                    }
+
+                    refreshing_event_uid.set(None);
+                });
+            }
+        })
+    };
+
     // Handle view mode changes - adjust current_date format when switching between month/week
     {
         let current_date = current_date.clone();
@@ -110,16 +270,19 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     let prev_month = *current_date - Duration::days(1);
                     let first_of_prev = prev_month.with_day(1).unwrap();
                     (first_of_prev, first_of_prev)
-                },
+                }
                 ViewMode::Week => {
                     // Go to previous week
                     let prev_week = *selected_date - Duration::weeks(1);
                     (prev_week, prev_week)
-                },
+                }
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
 
@@ -134,19 +297,23 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     let next_month = if current_date.month() == 12 {
                         NaiveDate::from_ymd_opt(current_date.year() + 1, 1, 1).unwrap()
                     } else {
-                        NaiveDate::from_ymd_opt(current_date.year(), current_date.month() + 1, 1).unwrap()
+                        NaiveDate::from_ymd_opt(current_date.year(), current_date.month() + 1, 1)
+                            .unwrap()
                     };
                     (next_month, next_month)
-                },
+                }
                 ViewMode::Week => {
                     // Go to next week
                     let next_week = *selected_date + Duration::weeks(1);
                     (next_week, next_week)
-                },
+                }
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
 
@@ -160,12 +327,15 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                 ViewMode::Month => {
                     let first_of_today = today.with_day(1).unwrap();
                     (today, first_of_today) // Select today, but display the month
-                },
+                }
                 ViewMode::Week => (today, today), // Select and display today
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
 
@@ -184,22 +354,58 @@ pub fn Calendar(props: &CalendarProps) -> Html {
     let on_create_event = {
         let show_create_modal = show_create_modal.clone();
         let create_event_data = create_event_data.clone();
-        Callback::from(move |(_date, start_datetime, end_datetime): (NaiveDate, chrono::NaiveDateTime, chrono::NaiveDateTime)| {
+        Callback::from(
+            move |(_date, start_datetime, end_datetime): (
+                NaiveDate,
+                chrono::NaiveDateTime,
+                chrono::NaiveDateTime,
+            )| {
                 // For drag-to-create, we don't need the temporary event approach
                 // Instead, just pass the local times directly via initial_time props
-            create_event_data.set(Some((start_datetime.date(), start_datetime.time(), end_datetime.time())));
+                create_event_data.set(Some((
+                    start_datetime.date(),
+                    start_datetime.time(),
+                    end_datetime.time(),
+                )));
                 show_create_modal.set(true);
-        })
+            },
+        )
     };
 
     // Handle drag-to-move event
     let on_event_update = {
         let on_event_update_request = props.on_event_update_request.clone();
-        Callback::from(move |(event, new_start, new_end, preserve_rrule, until_date, update_scope, occurrence_date): (VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)| {
+        Callback::from(
+            move |(
+                event,
+                new_start,
+                new_end,
+                preserve_rrule,
+                until_date,
+                update_scope,
+                occurrence_date,
+            ): (
+                VEvent,
+                chrono::NaiveDateTime,
+                chrono::NaiveDateTime,
+                bool,
+                Option<chrono::DateTime<chrono::Utc>>,
+                Option<String>,
+                Option<String>,
+            )| {
                 if let Some(callback) = &on_event_update_request {
-                callback.emit((event, new_start, new_end, preserve_rrule, until_date, update_scope, occurrence_date));
+                    callback.emit((
+                        event,
+                        new_start,
+                        new_end,
+                        preserve_rrule,
+                        until_date,
+                        update_scope,
+                        occurrence_date,
+                    ));
                 }
-        })
+            },
+        )
     };
 
     html! {
@@ -215,6 +421,19 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             />
 
             {
+                if *loading {
+                    html! {
+                        <div class="calendar-loading">
+                            <p>{"Loading calendar events..."}</p>
+                        </div>
+                    }
+                } else if let Some(err) = (*error).clone() {
+                    html! {
+                        <div class="calendar-error">
+                            <p>{format!("Error: {}", err)}</p>
+                        </div>
+                    }
+                } else {
                     match props.view {
                     ViewMode::Month => {
                         let on_day_select = {
@@ -229,9 +448,9 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                             <MonthView
                                 current_month={*current_date}
                                 today={today}
-                                events={props.events.clone()}
+                                events={(*events).clone()}
-                                on_event_click={props.on_event_click.clone()}
+                                on_event_click={on_event_click.clone()}
-                                refreshing_event_uid={props.refreshing_event_uid.clone()}
+                                refreshing_event_uid={(*refreshing_event_uid).clone()}
                                 user_info={props.user_info.clone()}
                                 on_event_context_menu={props.on_event_context_menu.clone()}
                                 on_calendar_context_menu={props.on_calendar_context_menu.clone()}
@@ -244,9 +463,9 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                         <WeekView
                             current_date={*current_date}
                             today={today}
-                            events={props.events.clone()}
+                            events={(*events).clone()}
-                            on_event_click={props.on_event_click.clone()}
+                            on_event_click={on_event_click.clone()}
-                            refreshing_event_uid={props.refreshing_event_uid.clone()}
+                            refreshing_event_uid={(*refreshing_event_uid).clone()}
                             user_info={props.user_info.clone()}
                             on_event_context_menu={props.on_event_context_menu.clone()}
                             on_calendar_context_menu={props.on_calendar_context_menu.clone()}
@@ -259,6 +478,7 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     },
                     }
                 }
+            }
 
             // Event details modal
             <EventModal

frontend/src/components/calendar_context_menu.rs

@@ -1,5 +1,5 @@
-use yew::prelude::*;
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarContextMenuProps {

frontend/src/components/calendar_header.rs

@@ -1,7 +1,7 @@
-use yew::prelude::*;
-use chrono::{NaiveDate, Datelike};
 use crate::components::ViewMode;
+use chrono::{Datelike, NaiveDate};
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarHeaderProps {
@@ -18,7 +18,11 @@ pub struct CalendarHeaderProps {
 
 #[function_component(CalendarHeader)]
 pub fn calendar_header(props: &CalendarHeaderProps) -> Html {
-    let title = format!("{} {}", get_month_name(props.current_date.month()), props.current_date.year());
+    let title = format!(
+        "{} {}",
+        get_month_name(props.current_date.month()),
+        props.current_date.year()
+    );
 
     html! {
         <div class="calendar-header">
@@ -59,6 +63,6 @@ fn get_month_name(month: u32) -> &'static str {
         10 => "October",
         11 => "November",
         12 => "December",
-        _ => "Invalid"
+        _ => "Invalid",
     }
 }

frontend/src/components/calendar_list_item.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use web_sys::MouseEvent;
 use crate::services::calendar_service::CalendarInfo;
+use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarListItemProps {

frontend/src/components/context_menu.rs

@@ -1,5 +1,5 @@
-use yew::prelude::*;
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct ContextMenuProps {

frontend/src/components/create_calendar_modal.rs

@@ -50,7 +50,9 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
             }
 
             if name.len() > 100 {
-                error_message.set(Some("Calendar name too long (max 100 characters)".to_string()));
+                error_message.set(Some(
+                    "Calendar name too long (max 100 characters)".to_string(),
+                ));
                 return;
             }
 

frontend/src/components/create_event_modal.rs

@@ -1,9 +1,10 @@
-use yew::prelude::*;
+use crate::components::EditAction;
-use web_sys::{HtmlInputElement, HtmlTextAreaElement, HtmlSelectElement};
-use wasm_bindgen::JsCast;
-use chrono::{NaiveDate, NaiveTime, Local, TimeZone, Utc, Datelike};
-use crate::services::calendar_service::CalendarInfo;
 use crate::models::ical::VEvent;
+use crate::services::calendar_service::CalendarInfo;
+use chrono::{Datelike, Local, NaiveDate, NaiveTime, TimeZone, Utc};
+use wasm_bindgen::JsCast;
+use web_sys::{HtmlInputElement, HtmlSelectElement, HtmlTextAreaElement};
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CreateEventModalProps {
@@ -18,6 +19,8 @@ pub struct CreateEventModalProps {
     pub initial_start_time: Option<NaiveTime>,
     #[prop_or_default]
     pub initial_end_time: Option<NaiveTime>,
+    #[prop_or_default]
+    pub edit_scope: Option<EditAction>,
 }
 
 #[derive(Clone, PartialEq, Debug)]
@@ -33,7 +36,6 @@ impl Default for EventStatus {
     }
 }
 
-
 #[derive(Clone, PartialEq, Debug)]
 pub enum EventClass {
     Public,
@@ -47,7 +49,6 @@ impl Default for EventClass {
     }
 }
 
-
 #[derive(Clone, PartialEq, Debug)]
 pub enum ReminderType {
     None,
@@ -81,7 +82,6 @@ impl Default for RecurrenceType {
     }
 }
 
-
 /// Parse RRULE string into recurrence components
 /// Example RRULE: "FREQ=WEEKLY;INTERVAL=2;BYDAY=MO,WE,FR;UNTIL=20231215T000000Z"
 #[derive(Debug, Default, Clone)]
@@ -142,9 +142,7 @@ fn parse_rrule(rrule: Option<&str>) -> ParsedRrule {
             }
             "BYDAY" => {
                 // Parse BYDAY: "MO,WE,FR" or "1MO,-1SU" (with position)
-                parsed.byday = value.split(',')
+                parsed.byday = value.split(',').map(|s| s.trim().to_uppercase()).collect();
-                    .map(|s| s.trim().to_uppercase())
-                    .collect();
             }
             "BYMONTHDAY" => {
                 // Parse BYMONTHDAY: "15" or "1,15,31"
@@ -158,7 +156,8 @@ fn parse_rrule(rrule: Option<&str>) -> ParsedRrule {
             }
             "BYMONTH" => {
                 // Parse BYMONTH: "1,3,5" (January, March, May)
-                parsed.bymonth = value.split(',')
+                parsed.bymonth = value
+                    .split(',')
                     .filter_map(|m| m.trim().parse::<u8>().ok())
                     .filter(|&m| m >= 1 && m <= 12)
                     .collect();
@@ -218,7 +217,8 @@ fn bymonth_to_monthly_array(bymonth: &[u8]) -> Vec<bool> {
 /// Extract positioned weekday from BYDAY for monthly recurrence
 /// Examples: "1MO" -> Some("1MO"), "2TU" -> Some("2TU"), "-1SU" -> Some("-1SU")
 fn extract_monthly_byday(byday: &[String]) -> Option<String> {
-    byday.iter()
+    byday
+        .iter()
         .find(|day| day.len() > 2) // Positioned days have length > 2
         .cloned()
 }
@@ -237,7 +237,9 @@ mod rrule_tests {
 
     #[test]
     fn test_parse_complex_monthly() {
-        let parsed = parse_rrule(Some("FREQ=MONTHLY;INTERVAL=2;BYDAY=1MO;UNTIL=20241231T000000Z"));
+        let parsed = parse_rrule(Some(
+            "FREQ=MONTHLY;INTERVAL=2;BYDAY=1MO;UNTIL=20241231T000000Z",
+        ));
         assert_eq!(parsed.freq, RecurrenceType::Monthly);
         assert_eq!(parsed.interval, 2);
         assert_eq!(parsed.byday, vec!["1MO"]);
@@ -246,7 +248,8 @@ mod rrule_tests {
 
     #[test]
     fn test_byday_to_weekday_array() {
-        let weekdays = byday_to_weekday_array(&["MO".to_string(), "WE".to_string(), "FR".to_string()]);
+        let weekdays =
+            byday_to_weekday_array(&["MO".to_string(), "WE".to_string(), "FR".to_string()]);
         // [Sun, Mon, Tue, Wed, Thu, Fri, Sat]
         assert_eq!(weekdays, vec![false, true, false, true, false, true, false]);
     }
@@ -292,14 +295,15 @@ mod rrule_tests {
     fn test_build_rrule_yearly() {
         let mut data = EventCreationData::default();
         data.recurrence = RecurrenceType::Yearly;
-        data.yearly_by_month = vec![false, false, true, false, true, false, false, false, false, false, false, false]; // March, May
+        data.yearly_by_month = vec![
+            false, false, true, false, true, false, false, false, false, false, false, false,
+        ]; // March, May
 
         let rrule = data.build_rrule();
         println!("YEARLY RRULE: {}", rrule);
         assert!(rrule.contains("FREQ=YEARLY"));
         assert!(rrule.contains("BYMONTH=3,5"));
     }
-
 }
 
 #[derive(Clone, PartialEq, Debug)]
@@ -330,6 +334,10 @@ pub struct EventCreationData {
     pub monthly_by_day: Option<String>, // For monthly: "1MO" = first Monday, "2TU" = second Tuesday, etc.
     pub monthly_by_monthday: Option<u8>, // For monthly: day of month (1-31)
     pub yearly_by_month: Vec<bool>,     // For yearly: [Jan, Feb, Mar, ..., Dec]
+
+    // Edit scope and tracking fields
+    pub edit_scope: Option<EditAction>,
+    pub changed_fields: Vec<String>, // List of field names that were changed
 }
 
 impl Default for EventCreationData {
@@ -365,6 +373,10 @@ impl Default for EventCreationData {
             monthly_by_day: None,
             monthly_by_monthday: None,
             yearly_by_month: vec![false; 12], // [Jan, Feb, ..., Dec] - all false by default
+
+            // Edit scope and tracking defaults
+            edit_scope: None,
+            changed_fields: vec![],
         }
     }
 }
@@ -396,9 +408,12 @@ impl EventCreationData {
         match self.recurrence {
             RecurrenceType::Weekly => {
                 // Add BYDAY for weekly recurrence
-                let selected_days: Vec<&str> = self.recurrence_days.iter()
+                let selected_days: Vec<&str> = self
+                    .recurrence_days
+                    .iter()
                     .enumerate()
-                    .filter_map(|(i, &selected)| if selected {
+                    .filter_map(|(i, &selected)| {
+                        if selected {
                             Some(match i {
                                 0 => "SU", // Sunday
                                 1 => "MO", // Monday
@@ -411,6 +426,7 @@ impl EventCreationData {
                             })
                         } else {
                             None
+                        }
                     })
                     .filter(|s| !s.is_empty())
                     .collect();
@@ -418,7 +434,7 @@ impl EventCreationData {
                 if !selected_days.is_empty() {
                     parts.push(format!("BYDAY={}", selected_days.join(",")));
                 }
-            },
+            }
             RecurrenceType::Monthly => {
                 // Add BYDAY or BYMONTHDAY for monthly recurrence
                 if let Some(ref by_day) = self.monthly_by_day {
@@ -426,22 +442,26 @@ impl EventCreationData {
                 } else if let Some(by_monthday) = self.monthly_by_monthday {
                     parts.push(format!("BYMONTHDAY={}", by_monthday));
                 }
-            },
+            }
             RecurrenceType::Yearly => {
                 // Add BYMONTH for yearly recurrence
-                let selected_months: Vec<String> = self.yearly_by_month.iter()
+                let selected_months: Vec<String> = self
+                    .yearly_by_month
+                    .iter()
                     .enumerate()
-                    .filter_map(|(i, &selected)| if selected {
+                    .filter_map(|(i, &selected)| {
+                        if selected {
                             Some((i + 1).to_string()) // Convert 0-based index to 1-based month
                         } else {
                             None
+                        }
                     })
                     .collect();
 
                 if !selected_months.is_empty() {
                     parts.push(format!("BYMONTH={}", selected_months.join(",")));
                 }
-            },
+            }
             _ => {}
         }
 
@@ -456,11 +476,36 @@ impl EventCreationData {
         parts.join(";")
     }
 
-    pub fn to_create_event_params(&self) -> (String, String, String, String, String, String, String, bool, String, String, Option<u8>, String, String, String, String, String, Vec<bool>, Option<String>) {
+    pub fn to_create_event_params(
+        &self,
+    ) -> (
+        String,
+        String,
+        String,
+        String,
+        String,
+        String,
+        String,
+        bool,
+        String,
+        String,
+        Option<u8>,
+        String,
+        String,
+        String,
+        String,
+        String,
+        Vec<bool>,
+        Option<String>,
+    ) {
         // Convert local date/time to UTC
-        let start_local = Local.from_local_datetime(&self.start_date.and_time(self.start_time)).single()
+        let start_local = Local
+            .from_local_datetime(&self.start_date.and_time(self.start_time))
+            .single()
             .unwrap_or_else(|| Local::now());
-        let end_local = Local.from_local_datetime(&self.end_date.and_time(self.end_time)).single()
+        let end_local = Local
+            .from_local_datetime(&self.end_date.and_time(self.end_time))
+            .single()
             .unwrap_or_else(|| Local::now());
 
         let start_utc = start_local.with_timezone(&Utc);
@@ -501,7 +546,7 @@ impl EventCreationData {
             },
             self.build_rrule(), // Use the comprehensive RRULE builder
             self.recurrence_days.clone(),
-            self.selected_calendar.clone()
+            self.selected_calendar.clone(),
         )
     }
 }
@@ -520,23 +565,48 @@ impl EventCreationData {
             description: event.description.clone().unwrap_or_default(),
             start_date: event.dtstart.with_timezone(&chrono::Local).date_naive(),
             start_time: event.dtstart.with_timezone(&chrono::Local).time(),
-            end_date: event.dtend.as_ref().map(|e| e.with_timezone(&chrono::Local).date_naive()).unwrap_or(event.dtstart.with_timezone(&chrono::Local).date_naive()),
+            end_date: event
-            end_time: event.dtend.as_ref().map(|e| e.with_timezone(&chrono::Local).time()).unwrap_or(event.dtstart.with_timezone(&chrono::Local).time()),
+                .dtend
+                .as_ref()
+                .map(|e| e.with_timezone(&chrono::Local).date_naive())
+                .unwrap_or(event.dtstart.with_timezone(&chrono::Local).date_naive()),
+            end_time: event
+                .dtend
+                .as_ref()
+                .map(|e| e.with_timezone(&chrono::Local).time())
+                .unwrap_or(event.dtstart.with_timezone(&chrono::Local).time()),
             location: event.location.clone().unwrap_or_default(),
             all_day: event.all_day,
-            status: event.status.as_ref().map(|s| match s {
+            status: event
+                .status
+                .as_ref()
+                .map(|s| match s {
                     crate::models::ical::EventStatus::Tentative => EventStatus::Tentative,
                     crate::models::ical::EventStatus::Confirmed => EventStatus::Confirmed,
                     crate::models::ical::EventStatus::Cancelled => EventStatus::Cancelled,
-            }).unwrap_or(EventStatus::Confirmed),
+                })
-            class: event.class.as_ref().map(|c| match c {
+                .unwrap_or(EventStatus::Confirmed),
+            class: event
+                .class
+                .as_ref()
+                .map(|c| match c {
                     crate::models::ical::EventClass::Public => EventClass::Public,
                     crate::models::ical::EventClass::Private => EventClass::Private,
                     crate::models::ical::EventClass::Confidential => EventClass::Confidential,
-            }).unwrap_or(EventClass::Public),
+                })
+                .unwrap_or(EventClass::Public),
             priority: event.priority,
-            organizer: event.organizer.as_ref().map(|o| o.cal_address.clone()).unwrap_or_default(),
+            organizer: event
-            attendees: event.attendees.iter().map(|a| a.cal_address.clone()).collect::<Vec<_>>().join(", "),
+                .organizer
+                .as_ref()
+                .map(|o| o.cal_address.clone())
+                .unwrap_or_default(),
+            attendees: event
+                .attendees
+                .iter()
+                .map(|a| a.cal_address.clone())
+                .collect::<Vec<_>>()
+                .join(", "),
             categories: event.categories.join(", "),
             reminder: ReminderType::default(), // TODO: Convert from event reminders
             recurrence: parsed_rrule.freq.clone(),
@@ -566,9 +636,12 @@ impl EventCreationData {
             } else {
                 vec![false; 12]
             },
-        }
-    }
 
+            // Edit scope and tracking defaults (will be set later if needed)
+            edit_scope: None,
+            changed_fields: vec![],
+        }
+    }
 }
 
 #[derive(Clone, PartialEq)]
@@ -593,9 +666,27 @@ pub fn create_event_modal(props: &CreateEventModalProps) -> Html {
     let active_tab = use_state(|| ModalTab::default());
 
     // Initialize with selected date or event data if provided
-    use_effect_with((props.selected_date, props.event_to_edit.clone(), props.is_open, props.available_calendars.clone(), props.initial_start_time, props.initial_end_time), {
+    use_effect_with(
+        (
+            props.selected_date,
+            props.event_to_edit.clone(),
+            props.is_open,
+            props.available_calendars.clone(),
+            props.initial_start_time,
+            props.initial_end_time,
+            props.edit_scope.clone(),
+        ),
+        {
             let event_data = event_data.clone();
-        move |(selected_date, event_to_edit, is_open, available_calendars, initial_start_time, initial_end_time)| {
+            move |(
+                selected_date,
+                event_to_edit,
+                is_open,
+                available_calendars,
+                initial_start_time,
+                initial_end_time,
+                edit_scope,
+            )| {
                 if *is_open {
                     let mut data = if let Some(event) = event_to_edit {
                         // Pre-populate with event data for editing
@@ -625,11 +716,17 @@ pub fn create_event_modal(props: &CreateEventModalProps) -> Html {
                         data.selected_calendar = Some(available_calendars[0].path.clone());
                     }
 
+                    // Set edit scope if provided
+                    if let Some(scope) = edit_scope {
+                        data.edit_scope = Some(scope.clone());
+                    }
+
                     event_data.set(data);
                 }
                 || ()
             }
-    });
+        },
+    );
 
     if !props.is_open {
         return html! {};
@@ -644,12 +741,25 @@ pub fn create_event_modal(props: &CreateEventModalProps) -> Html {
         })
     };
 
+    // Helper function to track field changes
+    let _track_field_change = |data: &mut EventCreationData, field_name: &str| {
+        if !data.changed_fields.contains(&field_name.to_string()) {
+            data.changed_fields.push(field_name.to_string());
+        }
+    };
+
     let on_title_input = {
         let event_data = event_data.clone();
         Callback::from(move |e: InputEvent| {
             if let Some(input) = e.target_dyn_into::<HtmlInputElement>() {
                 let mut data = (*event_data).clone();
-                data.title = input.value();
+                let new_value = input.value();
+                if data.title != new_value {
+                    data.title = new_value;
+                    if !data.changed_fields.contains(&"title".to_string()) {
+                        data.changed_fields.push("title".to_string());
+                    }
+                }
                 event_data.set(data);
             }
         })
@@ -661,7 +771,16 @@ pub fn create_event_modal(props: &CreateEventModalProps) -> Html {
             if let Some(select) = e.target_dyn_into::<HtmlSelectElement>() {
                 let mut data = (*event_data).clone();
                 let value = select.value();
-                data.selected_calendar = if value.is_empty() { None } else { Some(value) };
+                let new_calendar = if value.is_empty() { None } else { Some(value) };
+                if data.selected_calendar != new_calendar {
+                    data.selected_calendar = new_calendar;
+                    if !data
+                        .changed_fields
+                        .contains(&"selected_calendar".to_string())
+                    {
+                        data.changed_fields.push("selected_calendar".to_string());
+                    }
+                }
                 event_data.set(data);
             }
         })

frontend/src/components/event_context_menu.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use web_sys::MouseEvent;
 use crate::models::ical::VEvent;
+use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Clone, PartialEq, Debug)]
 pub enum DeleteAction {
@@ -9,13 +9,20 @@ pub enum DeleteAction {
     DeleteSeries,
 }
 
+#[derive(Clone, PartialEq, Debug)]
+pub enum EditAction {
+    EditThis,
+    EditFuture,
+    EditAll,
+}
+
 #[derive(Properties, PartialEq)]
 pub struct EventContextMenuProps {
     pub is_open: bool,
     pub x: i32,
     pub y: i32,
     pub event: Option<VEvent>,
-    pub on_edit: Callback<()>,
+    pub on_edit: Callback<EditAction>,
     pub on_delete: Callback<DeleteAction>,
     pub on_close: Callback<()>,
 }
@@ -34,15 +41,17 @@ pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
     );
 
     // Check if the event is recurring
-    let is_recurring = props.event.as_ref()
+    let is_recurring = props
+        .event
+        .as_ref()
         .map(|event| event.rrule.is_some())
         .unwrap_or(false);
 
-    let on_edit_click = {
+    let create_edit_callback = |action: EditAction| {
         let on_edit = props.on_edit.clone();
         let on_close = props.on_close.clone();
         Callback::from(move |_: MouseEvent| {
-            on_edit.emit(());
+            on_edit.emit(action.clone());
             on_close.emit(());
         })
     };
@@ -62,9 +71,29 @@ pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
             class="context-menu"
             style={style}
         >
-            <div class="context-menu-item" onclick={on_edit_click}>
+            {
+                if is_recurring {
+                    html! {
+                        <>
+                            <div class="context-menu-item" onclick={create_edit_callback(EditAction::EditThis)}>
+                                {"Edit This Event"}
+                            </div>
+                            <div class="context-menu-item" onclick={create_edit_callback(EditAction::EditFuture)}>
+                                {"Edit This and Future Events"}
+                            </div>
+                            <div class="context-menu-item" onclick={create_edit_callback(EditAction::EditAll)}>
+                                {"Edit All Events in Series"}
+                            </div>
+                        </>
+                    }
+                } else {
+                    html! {
+                        <div class="context-menu-item" onclick={create_edit_callback(EditAction::EditThis)}>
                             {"Edit Event"}
                         </div>
+                    }
+                }
+            }
             {
                 if is_recurring {
                     html! {

frontend/src/components/event_modal.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use chrono::{DateTime, Utc};
 use crate::models::ical::VEvent;
+use chrono::{DateTime, Utc};
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct EventModalProps {
@@ -236,4 +236,3 @@ fn format_recurrence_rule(rrule: &str) -> String {
         format!("Custom ({})", rrule)
     }
 }
-

frontend/src/components/login.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use web_sys::HtmlInputElement;
 use gloo_storage::{LocalStorage, Storage};
+use web_sys::HtmlInputElement;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct LoginProps {
@@ -9,12 +9,21 @@ pub struct LoginProps {
 
 #[function_component]
 pub fn Login(props: &LoginProps) -> Html {
-    let server_url = use_state(String::new);
+    // Load remembered values from LocalStorage on mount
-    let username = use_state(String::new);
+    let server_url = use_state(|| {
+        LocalStorage::get::<String>("remembered_server_url").unwrap_or_default()
+    });
+    let username = use_state(|| {
+        LocalStorage::get::<String>("remembered_username").unwrap_or_default()
+    });
     let password = use_state(String::new);
     let error_message = use_state(|| Option::<String>::None);
     let is_loading = use_state(|| false);
     
+    // Remember checkboxes state - default to checked
+    let remember_server = use_state(|| true);
+    let remember_username = use_state(|| true);
+
     let server_url_ref = use_node_ref();
     let username_ref = use_node_ref();
     let password_ref = use_node_ref();
@@ -43,6 +52,38 @@ pub fn Login(props: &LoginProps) -> Html {
         })
     };
     
+    let on_remember_server_change = {
+        let remember_server = remember_server.clone();
+        let server_url = server_url.clone();
+        Callback::from(move |e: Event| {
+            let target = e.target_unchecked_into::<HtmlInputElement>();
+            let checked = target.checked();
+            remember_server.set(checked);
+            
+            if checked {
+                let _ = LocalStorage::set("remembered_server_url", (*server_url).clone());
+            } else {
+                let _ = LocalStorage::delete("remembered_server_url");
+            }
+        })
+    };
+    
+    let on_remember_username_change = {
+        let remember_username = remember_username.clone();
+        let username = username.clone();
+        Callback::from(move |e: Event| {
+            let target = e.target_unchecked_into::<HtmlInputElement>();
+            let checked = target.checked();
+            remember_username.set(checked);
+            
+            if checked {
+                let _ = LocalStorage::set("remembered_username", (*username).clone());
+            } else {
+                let _ = LocalStorage::delete("remembered_username");
+            }
+        })
+    };
+
     let on_submit = {
         let server_url = server_url.clone();
         let username = username.clone();
@@ -73,11 +114,18 @@ pub fn Login(props: &LoginProps) -> Html {
             wasm_bindgen_futures::spawn_local(async move {
                 web_sys::console::log_1(&"🚀 Starting login process...".into());
                 match perform_login(server_url.clone(), username.clone(), password.clone()).await {
-                    Ok((token, credentials)) => {
+                    Ok((token, session_token, credentials, preferences)) => {
                         web_sys::console::log_1(&"✅ Login successful!".into());
                         // Store token and credentials in local storage
                         if let Err(_) = LocalStorage::set("auth_token", &token) {
-                            error_message.set(Some("Failed to store authentication token".to_string()));
+                            error_message
+                                .set(Some("Failed to store authentication token".to_string()));
+                            is_loading.set(false);
+                            return;
+                        }
+                        if let Err(_) = LocalStorage::set("session_token", &session_token) {
+                            error_message
+                                .set(Some("Failed to store session token".to_string()));
                             is_loading.set(false);
                             return;
                         }
@@ -87,6 +135,11 @@ pub fn Login(props: &LoginProps) -> Html {
                             return;
                         }
                         
+                        // Store preferences from database
+                        if let Ok(prefs_json) = serde_json::to_string(&preferences) {
+                            let _ = LocalStorage::set("user_preferences", &prefs_json);
+                        }
+
                         is_loading.set(false);
                         on_login.emit(token);
                     }
@@ -116,6 +169,15 @@ pub fn Login(props: &LoginProps) -> Html {
                             onchange={on_server_url_change}
                             disabled={*is_loading}
                         />
+                        <div class="remember-checkbox">
+                            <input
+                                type="checkbox"
+                                id="remember_server"
+                                checked={*remember_server}
+                                onchange={on_remember_server_change}
+                            />
+                            <label for="remember_server">{"Remember server"}</label>
+                        </div>
                     </div>
 
                     <div class="form-group">
@@ -129,6 +191,15 @@ pub fn Login(props: &LoginProps) -> Html {
                             onchange={on_username_change}
                             disabled={*is_loading}
                         />
+                        <div class="remember-checkbox">
+                            <input
+                                type="checkbox"
+                                id="remember_username"
+                                checked={*remember_username}
+                                onchange={on_remember_username_change}
+                            />
+                            <label for="remember_username">{"Remember username"}</label>
+                        </div>
                     </div>
 
                     <div class="form-group">
@@ -172,7 +243,11 @@ pub fn Login(props: &LoginProps) -> Html {
 }
 
 /// Perform login using the CalDAV auth service
-async fn perform_login(server_url: String, username: String, password: String) -> Result<(String, String), String> {
+async fn perform_login(
+    server_url: String,
+    username: String,
+    password: String,
+) -> Result<(String, String, String, serde_json::Value), String> {
     use crate::auth::{AuthService, CalDAVLoginRequest};
     use serde_json;
 
@@ -182,7 +257,7 @@ async fn perform_login(server_url: String, username: String, password: String) -
     let request = CalDAVLoginRequest {
         server_url: server_url.clone(),
         username: username.clone(),
-        password: password.clone() 
+        password: password.clone(),
     };
 
     web_sys::console::log_1(&format!("🚀 Sending login request to backend...").into());
@@ -196,11 +271,21 @@ async fn perform_login(server_url: String, username: String, password: String) -
                 "username": username,
                 "password": password
             });
-            Ok((response.token, credentials.to_string()))
+            
-        },
+            // Extract preferences as JSON
+            let preferences = serde_json::json!({
+                "calendar_selected_date": response.preferences.calendar_selected_date,
+                "calendar_time_increment": response.preferences.calendar_time_increment,
+                "calendar_view_mode": response.preferences.calendar_view_mode,
+                "calendar_theme": response.preferences.calendar_theme,
+                "calendar_colors": response.preferences.calendar_colors,
+            });
+            
+            Ok((response.token, response.session_token, credentials.to_string(), preferences))
+        }
         Err(err) => {
             web_sys::console::log_1(&format!("❌ Backend error: {}", err).into());
             Err(err)
-        },
+        }
     }
 }

frontend/src/components/mod.rs

@@ -1,31 +1,33 @@
-pub mod login;
 pub mod calendar;
-pub mod calendar_header;
-pub mod month_view;
-pub mod week_view;
-pub mod event_modal;
-pub mod create_calendar_modal;
-pub mod context_menu;
-pub mod event_context_menu;
 pub mod calendar_context_menu;
-pub mod create_event_modal;
+pub mod calendar_header;
-pub mod sidebar;
 pub mod calendar_list_item;
-pub mod route_handler;
+pub mod context_menu;
+pub mod create_calendar_modal;
+pub mod create_event_modal;
+pub mod event_context_menu;
+pub mod event_modal;
+pub mod login;
+pub mod month_view;
 pub mod recurring_edit_modal;
+pub mod route_handler;
+pub mod sidebar;
+pub mod week_view;
 
-pub use login::Login;
 pub use calendar::Calendar;
-pub use calendar_header::CalendarHeader;
-pub use month_view::MonthView;
-pub use week_view::WeekView;
-pub use event_modal::EventModal;
-pub use create_calendar_modal::CreateCalendarModal;
-pub use context_menu::ContextMenu;
-pub use event_context_menu::{EventContextMenu, DeleteAction};
 pub use calendar_context_menu::CalendarContextMenu;
-pub use create_event_modal::{CreateEventModal, EventCreationData, EventStatus, EventClass, ReminderType, RecurrenceType};
+pub use calendar_header::CalendarHeader;
-pub use sidebar::{Sidebar, ViewMode, Theme};
 pub use calendar_list_item::CalendarListItem;
+pub use context_menu::ContextMenu;
+pub use create_calendar_modal::CreateCalendarModal;
+pub use create_event_modal::{
+    CreateEventModal, EventClass, EventCreationData, EventStatus, RecurrenceType, ReminderType,
+};
+pub use event_context_menu::{DeleteAction, EditAction, EventContextMenu};
+pub use event_modal::EventModal;
+pub use login::Login;
+pub use month_view::MonthView;
+pub use recurring_edit_modal::{RecurringEditAction, RecurringEditModal};
 pub use route_handler::RouteHandler;
-pub use recurring_edit_modal::{RecurringEditModal, RecurringEditAction};
+pub use sidebar::{Sidebar, Theme, ViewMode};
+pub use week_view::WeekView;

frontend/src/components/month_view.rs

@@ -1,10 +1,10 @@
-use yew::prelude::*;
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
 use chrono::{Datelike, NaiveDate, Weekday};
 use std::collections::HashMap;
-use web_sys::window;
 use wasm_bindgen::{prelude::*, JsCast};
-use crate::services::calendar_service::UserInfo;
+use web_sys::window;
-use crate::models::ical::VEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct MonthViewProps {
@@ -72,7 +72,10 @@ pub fn month_view(props: &MonthViewProps) -> Html {
             }) as Box<dyn Fn()>);
 
             if let Some(window) = window() {
-                let _ = window.add_event_listener_with_callback("resize", resize_closure.as_ref().unchecked_ref());
+                let _ = window.add_event_listener_with_callback(
+                    "resize",
+                    resize_closure.as_ref().unchecked_ref(),
+                );
                 resize_closure.forget(); // Keep the closure alive
             }
 
@@ -84,8 +87,11 @@ pub fn month_view(props: &MonthViewProps) -> Html {
     let get_event_color = |event: &VEvent| -> String {
         if let Some(user_info) = &props.user_info {
             if let Some(calendar_path) = &event.calendar_path {
-                if let Some(calendar) = user_info.calendars.iter()
+                if let Some(calendar) = user_info
-                    .find(|cal| &cal.path == calendar_path) {
+                    .calendars
+                    .iter()
+                    .find(|cal| &cal.path == calendar_path)
+                {
                     return calendar.color.clone();
                 }
             }
@@ -221,20 +227,34 @@ pub fn month_view(props: &MonthViewProps) -> Html {
 fn render_next_month_days(prev_days_count: usize, current_days_count: u32) -> Html {
     let total_slots = 42; // 6 rows x 7 days
     let used_slots = prev_days_count + current_days_count as usize;
-    let remaining_slots = if used_slots < total_slots { total_slots - used_slots } else { 0 };
+    let remaining_slots = if used_slots < total_slots {
+        total_slots - used_slots
+    } else {
+        0
+    };
 
-    (1..=remaining_slots).map(|day| {
+    (1..=remaining_slots)
+        .map(|day| {
             html! {
                 <div class="calendar-day next-month">{day}</div>
             }
-    }).collect::<Html>()
+        })
+        .collect::<Html>()
 }
 
 fn get_days_in_month(date: NaiveDate) -> u32 {
     NaiveDate::from_ymd_opt(
-        if date.month() == 12 { date.year() + 1 } else { date.year() },
+        if date.month() == 12 {
-        if date.month() == 12 { 1 } else { date.month() + 1 },
+            date.year() + 1
+        } else {
+            date.year()
+        },
+        if date.month() == 12 {
             1
+        } else {
+            date.month() + 1
+        },
+        1,
     )
     .unwrap()
     .pred_opt()

frontend/src/components/recurring_edit_modal.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use chrono::NaiveDateTime;
 use crate::models::ical::VEvent;
+use chrono::NaiveDateTime;
+use yew::prelude::*;
 
 #[derive(Clone, PartialEq)]
 pub enum RecurringEditAction {
@@ -25,7 +25,12 @@ pub fn recurring_edit_modal(props: &RecurringEditModalProps) -> Html {
         return html! {};
     }
 
-    let event_title = props.event.summary.as_ref().map(|s| s.as_str()).unwrap_or("Untitled Event");
+    let event_title = props
+        .event
+        .summary
+        .as_ref()
+        .map(|s| s.as_str())
+        .unwrap_or("Untitled Event");
 
     let on_this_event = {
         let on_choice = props.on_choice.clone();

frontend/src/components/route_handler.rs

@@ -1,8 +1,8 @@
+use crate::components::{Login, ViewMode};
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
 use yew::prelude::*;
 use yew_router::prelude::*;
-use crate::components::{Login, ViewMode};
-use crate::services::calendar_service::UserInfo;
-use crate::models::ical::VEvent;
 
 #[derive(Clone, Routable, PartialEq)]
 pub enum Route {
@@ -28,7 +28,17 @@ pub struct RouteHandlerProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
@@ -106,165 +116,28 @@ pub struct CalendarViewProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
 
-use gloo_storage::{LocalStorage, Storage};
-use crate::services::CalendarService;
 use crate::components::Calendar;
-use std::collections::HashMap;
-use chrono::{Local, NaiveDate, Datelike};
 
 #[function_component(CalendarView)]
 pub fn calendar_view(props: &CalendarViewProps) -> Html {
-    let events = use_state(|| HashMap::<NaiveDate, Vec<VEvent>>::new());
-    let loading = use_state(|| true);
-    let error = use_state(|| None::<String>);
-    let refreshing_event = use_state(|| None::<String>);
-    
-    let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
-    
-    
-    let today = Local::now().date_naive();
-    let current_year = today.year();
-    let current_month = today.month();
-    
-    let on_event_click = {
-        let events = events.clone();
-        let refreshing_event = refreshing_event.clone();
-        let auth_token = auth_token.clone();
-        
-        Callback::from(move |event: VEvent| {
-            if let Some(token) = auth_token.clone() {
-                let events = events.clone();
-                let refreshing_event = refreshing_event.clone();
-                let uid = event.uid.clone();
-                
-                refreshing_event.set(Some(uid.clone()));
-                
-                wasm_bindgen_futures::spawn_local(async move {
-                    let calendar_service = CalendarService::new();
-                    
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
-                            credentials["password"].as_str().unwrap_or("").to_string()
-                        } else {
-                            String::new()
-                        }
-                    } else {
-                        String::new()
-                    };
-                    
-                    match calendar_service.refresh_event(&token, &password, &uid).await {
-                        Ok(Some(refreshed_event)) => {
-                            let refreshed_vevent = refreshed_event; // CalendarEvent is now VEvent
-                            let mut updated_events = (*events).clone();
-                            
-                            for (_, day_events) in updated_events.iter_mut() {
-                                day_events.retain(|e| e.uid != uid);
-                            }
-                            
-                            if refreshed_vevent.rrule.is_some() {
-                                let new_occurrences = CalendarService::expand_recurring_events(vec![refreshed_vevent.clone()]);
-                                
-                                for occurrence in new_occurrences {
-                                    let date = occurrence.get_date();
-                                    updated_events.entry(date)
-                                        .or_insert_with(Vec::new)
-                                        .push(occurrence);
-                                }
-                            } else {
-                                let date = refreshed_vevent.get_date();
-                                updated_events.entry(date)
-                                    .or_insert_with(Vec::new)
-                                    .push(refreshed_vevent);
-                            }
-                            
-                            events.set(updated_events);
-                        }
-                        Ok(None) => {
-                            let mut updated_events = (*events).clone();
-                            for (_, day_events) in updated_events.iter_mut() {
-                                day_events.retain(|e| e.uid != uid);
-                            }
-                            events.set(updated_events);
-                        }
-                        Err(_err) => {
-                        }
-                    }
-                    
-                    refreshing_event.set(None);
-                });
-            }
-        })
-    };
-    
-    {
-        let events = events.clone();
-        let loading = loading.clone();
-        let error = error.clone();
-        let auth_token = auth_token.clone();
-        
-        use_effect_with((), move |_| {
-            if let Some(token) = auth_token {
-                let events = events.clone();
-                let loading = loading.clone();
-                let error = error.clone();
-                
-                wasm_bindgen_futures::spawn_local(async move {
-                    let calendar_service = CalendarService::new();
-                    
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
-                            credentials["password"].as_str().unwrap_or("").to_string()
-                        } else {
-                            String::new()
-                        }
-                    } else {
-                        String::new()
-                    };
-                    
-                    match calendar_service.fetch_events_for_month_vevent(&token, &password, current_year, current_month).await {
-                        Ok(vevents) => {
-                            let grouped_events = CalendarService::group_events_by_date(vevents);
-                            events.set(grouped_events);
-                            loading.set(false);
-                        }
-                        Err(err) => {
-                            error.set(Some(format!("Failed to load events: {}", err)));
-                            loading.set(false);
-                        }
-                    }
-                });
-            } else {
-                loading.set(false);
-                error.set(Some("No authentication token found".to_string()));
-            }
-            
-            || ()
-        });
-    }
-    
     html! {
         <div class="calendar-view">
-            {
-                if *loading {
-                    html! {
-                        <div class="calendar-loading">
-                            <p>{"Loading calendar events..."}</p>
-                        </div>
-                    }
-                } else if let Some(err) = (*error).clone() {
-                    let dummy_callback = Callback::from(|_: VEvent| {});
-                    html! {
-                        <div class="calendar-error">
-                            <p>{format!("Error: {}", err)}</p>
             <Calendar
-                                events={HashMap::new()} 
-                                on_event_click={dummy_callback} 
-                                refreshing_event_uid={(*refreshing_event).clone()} 
                 user_info={props.user_info.clone()}
                 on_event_context_menu={props.on_event_context_menu.clone()}
                 on_calendar_context_menu={props.on_calendar_context_menu.clone()}
@@ -275,23 +148,4 @@ pub fn calendar_view(props: &CalendarViewProps) -> Html {
             />
         </div>
     }
-                } else {
-                    html! {
-                        <Calendar 
-                            events={(*events).clone()} 
-                            on_event_click={on_event_click} 
-                            refreshing_event_uid={(*refreshing_event).clone()} 
-                            user_info={props.user_info.clone()}
-                            on_event_context_menu={props.on_event_context_menu.clone()}
-                            on_calendar_context_menu={props.on_calendar_context_menu.clone()}
-                            view={props.view.clone()}
-                            on_create_event_request={props.on_create_event_request.clone()}
-                            on_event_update_request={props.on_event_update_request.clone()}
-                            context_menus_open={props.context_menus_open}
-                        />
-                    }
-                }
-            }
-        </div>
-    }
 }

frontend/src/components/sidebar.rs

@@ -1,8 +1,8 @@
+use crate::components::CalendarListItem;
+use crate::services::calendar_service::UserInfo;
+use web_sys::HtmlSelectElement;
 use yew::prelude::*;
 use yew_router::prelude::*;
-use web_sys::HtmlSelectElement;
-use crate::services::calendar_service::UserInfo;
-use crate::components::CalendarListItem;
 
 #[derive(Clone, Routable, PartialEq)]
 pub enum Route {
@@ -33,7 +33,6 @@ pub enum Theme {
 }
 
 impl Theme {
-    
     pub fn value(&self) -> &'static str {
         match self {
             Theme::Default => "default",

frontend/src/components/week_view.rs

@@ -1,10 +1,10 @@
-use yew::prelude::*;
+use crate::components::{EventCreationData, RecurringEditAction, RecurringEditModal};
-use chrono::{Datelike, NaiveDate, Duration, Weekday, Local, Timelike, NaiveDateTime, NaiveTime};
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
+use chrono::{Datelike, Duration, Local, NaiveDate, NaiveDateTime, NaiveTime, Timelike, Weekday};
 use std::collections::HashMap;
 use web_sys::MouseEvent;
-use crate::services::calendar_service::UserInfo;
+use yew::prelude::*;
-use crate::models::ical::VEvent;
-use crate::components::{RecurringEditModal, RecurringEditAction, EventCreationData};
 
 #[derive(Properties, PartialEq)]
 pub struct WeekViewProps {
@@ -25,7 +25,17 @@ pub struct WeekViewProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update: Option<Callback<(VEvent, NaiveDateTime, NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update: Option<
+        Callback<(
+            VEvent,
+            NaiveDateTime,
+            NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
     #[prop_or_default]
@@ -54,9 +64,7 @@ struct DragState {
 #[function_component(WeekView)]
 pub fn week_view(props: &WeekViewProps) -> Html {
     let start_of_week = get_start_of_week(props.current_date);
-    let week_days: Vec<NaiveDate> = (0..7)
+    let week_days: Vec<NaiveDate> = (0..7).map(|i| start_of_week + Duration::days(i)).collect();
-        .map(|i| start_of_week + Duration::days(i))
-        .collect();
 
     // Drag state for event creation
     let drag_state = use_state(|| None::<DragState>);
@@ -75,8 +83,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
     let get_event_color = |event: &VEvent| -> String {
         if let Some(user_info) = &props.user_info {
             if let Some(calendar_path) = &event.calendar_path {
-                if let Some(calendar) = user_info.calendars.iter()
+                if let Some(calendar) = user_info
-                    .find(|cal| &cal.path == calendar_path) {
+                    .calendars
+                    .iter()
+                    .find(|cal| &cal.path == calendar_path)
+                {
                     return calendar.color.clone();
                 }
             }
@@ -85,7 +96,8 @@ pub fn week_view(props: &WeekViewProps) -> Html {
     };
 
     // Generate time labels - 24 hours plus the final midnight boundary
-    let mut time_labels: Vec<String> = (0..24).map(|hour| {
+    let mut time_labels: Vec<String> = (0..24)
+        .map(|hour| {
             if hour == 0 {
                 "12 AM".to_string()
             } else if hour < 12 {
@@ -95,12 +107,12 @@ pub fn week_view(props: &WeekViewProps) -> Html {
             } else {
                 format!("{} PM", hour - 12)
             }
-    }).collect();
+        })
+        .collect();
 
     // Add the final midnight boundary to show where the day ends
     time_labels.push("12 AM".to_string());
 
-
     // Handlers for recurring event modification modal
     let on_recurring_choice = {
         let pending_recurring_edit = pending_recurring_edit.clone();
@@ -147,10 +159,10 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                 true,                          // preserve_rrule = true
                                 None,                          // No until_date for this_only
                                 Some("this_only".to_string()), // Update scope
-                                Some(occurrence_date)   // Date of occurrence being modified
+                                Some(occurrence_date),         // Date of occurrence being modified
                             ));
                         }
-                    },
+                    }
                     RecurringEditAction::FutureEvents => {
                         // RFC 5545 Compliant Series Splitting: "This and Future Events"
                         //
@@ -177,7 +189,8 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                         if let Some(update_callback) = &on_event_update {
                             // Find the original series event (not the occurrence)
                             // UIDs like "uuid-timestamp" need to split on the last hyphen, not the first
-                            let base_uid = if let Some(last_hyphen_pos) = edit.event.uid.rfind('-') {
+                            let base_uid = if let Some(last_hyphen_pos) = edit.event.uid.rfind('-')
+                            {
                                 let suffix = &edit.event.uid[last_hyphen_pos + 1..];
                                 // Check if suffix is numeric (timestamp), if so remove it
                                 if suffix.chars().all(|c| c.is_numeric()) {
@@ -189,7 +202,13 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                 edit.event.uid.clone()
                             };
 
-                            web_sys::console::log_1(&format!("🔍 Looking for original series: '{}' from occurrence: '{}'", base_uid, edit.event.uid).into());
+                            web_sys::console::log_1(
+                                &format!(
+                                    "🔍 Looking for original series: '{}' from occurrence: '{}'",
+                                    base_uid, edit.event.uid
+                                )
+                                .into(),
+                            );
 
                             // Find the original series event by searching for the base UID
                             let mut original_series = None;
@@ -207,9 +226,12 @@ pub fn week_view(props: &WeekViewProps) -> Html {
 
                             let original_series = match original_series {
                                 Some(series) => {
-                                    web_sys::console::log_1(&format!("✅ Found original series: '{}'", series.uid).into());
+                                    web_sys::console::log_1(
+                                        &format!("✅ Found original series: '{}'", series.uid)
+                                            .into(),
+                                    );
                                     series
-                                },
+                                }
                                 None => {
                                     web_sys::console::log_1(&format!("⚠️  Could not find original series '{}', using occurrence but fixing UID", base_uid).into());
                                     let mut fallback_event = edit.event.clone();
@@ -220,9 +242,15 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                             };
 
                             // Calculate the day before this occurrence for UNTIL clause
-                            let until_date = edit.event.dtstart.date_naive() - chrono::Duration::days(1);
+                            let until_date =
-                            let until_datetime = until_date.and_time(chrono::NaiveTime::from_hms_opt(23, 59, 59).unwrap());
+                                edit.event.dtstart.date_naive() - chrono::Duration::days(1);
-                            let until_utc = chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(until_datetime, chrono::Utc);
+                            let until_datetime = until_date
+                                .and_time(chrono::NaiveTime::from_hms_opt(23, 59, 59).unwrap());
+                            let until_utc =
+                                chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(
+                                    until_datetime,
+                                    chrono::Utc,
+                                );
 
                             web_sys::console::log_1(&format!("🔄 Will set UNTIL {} for original series to end before occurrence {}", 
                                 until_utc.format("%Y-%m-%d %H:%M:%S UTC"),
@@ -249,18 +277,26 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                 true,            // preserve_rrule = true
                                 Some(until_utc), // UNTIL date for original series
                                 Some("this_and_future".to_string()), // Update scope
-                                Some(occurrence_date) // Date of occurrence being modified
+                                Some(occurrence_date), // Date of occurrence being modified
                             ));
                         }
-                    },
+                    }
                     RecurringEditAction::AllEvents => {
                         // Modify the entire series
                         let series_event = edit.event.clone();
 
                         if let Some(callback) = &on_event_update {
-                            callback.emit((series_event, edit.new_start, edit.new_end, true, None, Some("all_in_series".to_string()), None)); // Regular drag operation - preserve RRULE, update_scope = all_in_series
+                            callback.emit((
+                                series_event,
+                                edit.new_start,
+                                edit.new_end,
+                                true,
+                                None,
+                                Some("all_in_series".to_string()),
+                                None,
+                            )); // Regular drag operation - preserve RRULE, update_scope = all_in_series
+                        }
                     }
-                    },
                 }
             }
             pending_recurring_edit.set(None);
@@ -988,7 +1024,6 @@ fn pixels_to_time(pixels: f64) -> NaiveTime {
     NaiveTime::from_hms_opt(hours, minutes, 0).unwrap_or(NaiveTime::from_hms_opt(0, 0, 0).unwrap())
 }
 
-
 fn calculate_event_position(event: &VEvent, date: NaiveDate) -> (f32, f32, bool) {
     // Convert UTC times to local time for display
     let local_start = event.dtstart.with_timezone(&Local);
@@ -1009,7 +1044,6 @@ fn calculate_event_position(event: &VEvent, date: NaiveDate) -> (f32, f32, bool)
     let start_minute = local_start.minute() as f32;
     let start_pixels = (start_hour + start_minute / 60.0) * 60.0; // 60px per hour
 
-    
     // Calculate duration and height
     let duration_pixels = if let Some(end) = event.dtend {
         let local_end = end.with_timezone(&Local);

frontend/src/config.rs

@@ -1,284 +0,0 @@
-use serde::{Deserialize, Serialize};
-use std::env;
-use base64::prelude::*;
-
-/// Configuration for CalDAV server connection and authentication.
-/// 
-/// This struct holds all the necessary information to connect to a CalDAV server,
-/// including server URL, credentials, and optional collection paths.
-/// 
-/// # Security Note
-/// 
-/// The password field contains sensitive information and should be handled carefully.
-/// This struct implements `Debug` but in production, consider implementing a custom
-/// `Debug` that masks the password field.
-/// 
-/// # Example
-/// 
-/// ```rust
-/// use crate::config::CalDAVConfig;
-/// 
-/// // Load configuration from environment variables
-/// let config = CalDAVConfig::from_env()?;
-/// 
-/// // Use the configuration for HTTP requests
-/// let auth_header = format!("Basic {}", config.get_basic_auth());
-/// ```
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CalDAVConfig {
-    /// The base URL of the CalDAV server (e.g., "https://caldav.example.com/dav/")
-    pub server_url: String,
-    
-    /// Username for authentication with the CalDAV server
-    pub username: String,
-    
-    /// Password for authentication with the CalDAV server
-    /// 
-    /// **Security Note**: This contains sensitive information
-    pub password: String,
-    
-    /// Optional path to the calendar collection on the server
-    /// 
-    /// If not provided, the client will need to discover available calendars
-    /// through CalDAV PROPFIND requests
-    pub calendar_path: Option<String>,
-    
-    /// Optional path to the tasks/todo collection on the server
-    /// 
-    /// Some CalDAV servers store tasks separately from calendar events
-    pub tasks_path: Option<String>,
-}
-
-impl CalDAVConfig {
-    /// Creates a new CalDAVConfig by loading values from environment variables.
-    /// 
-    /// This method will attempt to load a `.env` file from the current directory
-    /// and then read the following required environment variables:
-    /// 
-    /// - `CALDAV_SERVER_URL`: The CalDAV server base URL
-    /// - `CALDAV_USERNAME`: Username for authentication
-    /// - `CALDAV_PASSWORD`: Password for authentication
-    /// 
-    /// Optional environment variables:
-    /// 
-    /// - `CALDAV_CALENDAR_PATH`: Path to calendar collection
-    /// - `CALDAV_TASKS_PATH`: Path to tasks collection
-    /// 
-    /// # Errors
-    /// 
-    /// Returns `ConfigError::MissingVar` if any required environment variable
-    /// is not set or cannot be read.
-    /// 
-    /// # Example
-    /// 
-    /// ```rust
-    /// use crate::config::CalDAVConfig;
-    /// 
-    /// match CalDAVConfig::from_env() {
-    ///     Ok(config) => {
-    ///         println!("Loaded config for server: {}", config.server_url);
-    ///     }
-    ///     Err(e) => {
-    ///         eprintln!("Failed to load config: {}", e);
-    ///     }
-    /// }
-    /// ```
-    pub fn from_env() -> Result<Self, ConfigError> {
-        // Attempt to load .env file, but don't fail if it doesn't exist
-        dotenvy::dotenv().ok();
-
-        let server_url = env::var("CALDAV_SERVER_URL")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_SERVER_URL".to_string()))?;
-
-        let username = env::var("CALDAV_USERNAME")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_USERNAME".to_string()))?;
-
-        let password = env::var("CALDAV_PASSWORD")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_PASSWORD".to_string()))?;
-
-        // Optional paths - it's fine if these are not set
-        let calendar_path = env::var("CALDAV_CALENDAR_PATH").ok();
-        let tasks_path = env::var("CALDAV_TASKS_PATH").ok();
-
-        Ok(CalDAVConfig {
-            server_url,
-            username,
-            password,
-            calendar_path,
-            tasks_path,
-        })
-    }
-
-    /// Generates a Base64-encoded string for HTTP Basic Authentication.
-    /// 
-    /// This method combines the username and password in the format
-    /// `username:password` and encodes it using Base64, which is the
-    /// standard format for the `Authorization: Basic` HTTP header.
-    /// 
-    /// # Returns
-    /// 
-    /// A Base64-encoded string that can be used directly in the
-    /// `Authorization` header: `Authorization: Basic <returned_value>`
-    /// 
-    /// # Example
-    /// 
-    /// ```rust
-    /// use crate::config::CalDAVConfig;
-    /// 
-    /// let config = CalDAVConfig {
-    ///     server_url: "https://example.com".to_string(),
-    ///     username: "user".to_string(),
-    ///     password: "pass".to_string(),
-    ///     calendar_path: None,
-    ///     tasks_path: None,
-    /// };
-    /// 
-    /// let auth_value = config.get_basic_auth();
-    /// let auth_header = format!("Basic {}", auth_value);
-    /// ```
-    pub fn get_basic_auth(&self) -> String {
-        let credentials = format!("{}:{}", self.username, self.password);
-        BASE64_STANDARD.encode(&credentials)
-    }
-}
-
-/// Errors that can occur when loading or using CalDAV configuration.
-#[derive(Debug, thiserror::Error)]
-pub enum ConfigError {
-    /// A required environment variable is missing or cannot be read.
-    /// 
-    /// This error occurs when calling `CalDAVConfig::from_env()` and one of the
-    /// required environment variables (`CALDAV_SERVER_URL`, `CALDAV_USERNAME`,
-    /// or `CALDAV_PASSWORD`) is not set.
-    #[error("Missing environment variable: {0}")]
-    MissingVar(String),
-    
-    /// The configuration contains invalid or malformed values.
-    /// 
-    /// This could include malformed URLs, invalid authentication credentials,
-    /// or other configuration issues that prevent proper CalDAV operation.
-    #[error("Invalid configuration: {0}")]
-    Invalid(String),
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_basic_auth_encoding() {
-        let config = CalDAVConfig {
-            server_url: "https://example.com".to_string(),
-            username: "testuser".to_string(),
-            password: "testpass".to_string(),
-            calendar_path: None,
-            tasks_path: None,
-        };
-
-        let auth = config.get_basic_auth();
-        let expected = BASE64_STANDARD.encode("testuser:testpass");
-        assert_eq!(auth, expected);
-    }
-
-    /// Integration test that authenticates with the actual Baikal CalDAV server
-    /// 
-    /// This test requires a valid .env file with:
-    /// - CALDAV_SERVER_URL
-    /// - CALDAV_USERNAME  
-    /// - CALDAV_PASSWORD
-    /// 
-    /// Run with: `cargo test test_baikal_auth`
-    #[tokio::test]
-    async fn test_baikal_auth() {
-        // Load config from .env
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
-
-        println!("Testing authentication to: {}", config.server_url);
-
-        // Create HTTP client
-        let client = reqwest::Client::new();
-
-        // Make a simple OPTIONS request to test authentication
-        let response = client
-            .request(reqwest::Method::OPTIONS, &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
-            .header("User-Agent", "calendar-app/0.1.0")
-            .send()
-            .await
-            .expect("Failed to send request to CalDAV server");
-
-        println!("Response status: {}", response.status());
-        println!("Response headers: {:#?}", response.headers());
-
-        // Check if we got a successful response or at least not a 401 Unauthorized
-        assert!(
-            response.status().is_success() || response.status() != 401,
-            "Authentication failed with status: {}. Check your credentials in .env",
-            response.status()
-        );
-
-        // For Baikal/CalDAV servers, we should see DAV headers
-        assert!(
-            response.headers().contains_key("dav") || 
-            response.headers().contains_key("DAV") ||
-            response.status().is_success(),
-            "Server doesn't appear to be a CalDAV server - missing DAV headers"
-        );
-
-        println!("✓ Authentication test passed!");
-    }
-
-    /// Test making a PROPFIND request to discover calendars
-    /// 
-    /// This test requires a valid .env file and makes an actual CalDAV PROPFIND request
-    /// 
-    /// Run with: `cargo test test_propfind_calendars`
-    #[tokio::test]
-    async fn test_propfind_calendars() {
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
-
-        let client = reqwest::Client::new();
-
-        // CalDAV PROPFIND request to discover calendars
-        let propfind_body = r#"<?xml version="1.0" encoding="utf-8" ?>
-<d:propfind xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
-    <d:prop>
-        <d:resourcetype />
-        <d:displayname />
-        <c:calendar-description />
-        <c:supported-calendar-component-set />
-    </d:prop>
-</d:propfind>"#;
-
-        let response = client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
-            .header("Content-Type", "application/xml")
-            .header("Depth", "1")
-            .header("User-Agent", "calendar-app/0.1.0")
-            .body(propfind_body)
-            .send()
-            .await
-            .expect("Failed to send PROPFIND request");
-
-        let status = response.status();
-        println!("PROPFIND Response status: {}", status);
-        
-        let body = response.text().await.expect("Failed to read response body");
-        println!("PROPFIND Response body: {}", body);
-
-        // We should get a 207 Multi-Status for PROPFIND
-        assert_eq!(
-            status,
-            reqwest::StatusCode::from_u16(207).unwrap(),
-            "PROPFIND should return 207 Multi-Status"
-        );
-
-        // The response should contain XML with calendar information
-        assert!(body.contains("calendar"), "Response should contain calendar information");
-
-        println!("✓ PROPFIND calendars test passed!");
-    }
-}

frontend/src/main.rs

@@ -1,4 +1,3 @@
-
 mod app;
 mod auth;
 mod components;

frontend/src/services/mod.rs

@@ -1,3 +1,5 @@
 pub mod calendar_service;
+pub mod preferences;
 
 pub use calendar_service::CalendarService;
+pub use preferences::PreferencesService;

frontend/src/services/preferences.rs

@@ -0,0 +1,177 @@
+use gloo_storage::{LocalStorage, Storage};
+use serde::{Deserialize, Serialize};
+use serde_json;
+use wasm_bindgen::JsCast;
+use wasm_bindgen_futures::JsFuture;
+use web_sys::{Request, RequestInit, RequestMode, Response};
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferences {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct UpdatePreferencesRequest {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+pub struct PreferencesService {
+    base_url: String,
+}
+
+impl PreferencesService {
+    pub fn new() -> Self {
+        let base_url = option_env!("BACKEND_API_URL")
+            .unwrap_or("http://localhost:3000/api")
+            .to_string();
+        
+        Self { base_url }
+    }
+    
+    /// Load preferences from LocalStorage (cached from login)
+    pub fn load_cached() -> Option<UserPreferences> {
+        if let Ok(prefs_json) = LocalStorage::get::<String>("user_preferences") {
+            serde_json::from_str(&prefs_json).ok()
+        } else {
+            None
+        }
+    }
+    
+    /// Update a single preference field and sync with backend
+    pub async fn update_preference(&self, field: &str, value: serde_json::Value) -> Result<(), String> {
+        // Get session token
+        let session_token = LocalStorage::get::<String>("session_token")
+            .map_err(|_| "No session token found".to_string())?;
+        
+        // Load current preferences
+        let mut preferences = Self::load_cached().unwrap_or(UserPreferences {
+            calendar_selected_date: None,
+            calendar_time_increment: None,
+            calendar_view_mode: None,
+            calendar_theme: None,
+            calendar_colors: None,
+        });
+        
+        // Update the specific field
+        match field {
+            "calendar_selected_date" => {
+                preferences.calendar_selected_date = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_time_increment" => {
+                preferences.calendar_time_increment = value.as_i64().map(|i| i as i32);
+            }
+            "calendar_view_mode" => {
+                preferences.calendar_view_mode = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_theme" => {
+                preferences.calendar_theme = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_colors" => {
+                preferences.calendar_colors = value.as_str().map(|s| s.to_string());
+            }
+            _ => return Err(format!("Unknown preference field: {}", field)),
+        }
+        
+        // Save to LocalStorage cache
+        if let Ok(prefs_json) = serde_json::to_string(&preferences) {
+            let _ = LocalStorage::set("user_preferences", &prefs_json);
+        }
+        
+        // Sync with backend
+        let request = UpdatePreferencesRequest {
+            calendar_selected_date: preferences.calendar_selected_date.clone(),
+            calendar_time_increment: preferences.calendar_time_increment,
+            calendar_view_mode: preferences.calendar_view_mode.clone(),
+            calendar_theme: preferences.calendar_theme.clone(),
+            calendar_colors: preferences.calendar_colors.clone(),
+        };
+        
+        self.sync_preferences(&session_token, &request).await
+    }
+    
+    /// Sync all preferences with backend
+    async fn sync_preferences(
+        &self,
+        session_token: &str,
+        request: &UpdatePreferencesRequest,
+    ) -> Result<(), String> {
+        let window = web_sys::window().ok_or("No global window exists")?;
+        
+        let json_body = serde_json::to_string(request)
+            .map_err(|e| format!("JSON serialization failed: {}", e))?;
+        
+        let opts = RequestInit::new();
+        opts.set_method("POST");
+        opts.set_mode(RequestMode::Cors);
+        opts.set_body(&wasm_bindgen::JsValue::from_str(&json_body));
+        
+        let url = format!("{}/preferences", self.base_url);
+        let request = Request::new_with_str_and_init(&url, &opts)
+            .map_err(|e| format!("Request creation failed: {:?}", e))?;
+        
+        request
+            .headers()
+            .set("Content-Type", "application/json")
+            .map_err(|e| format!("Header setting failed: {:?}", e))?;
+        
+        request
+            .headers()
+            .set("X-Session-Token", session_token)
+            .map_err(|e| format!("Header setting failed: {:?}", e))?;
+        
+        let resp_value = JsFuture::from(window.fetch_with_request(&request))
+            .await
+            .map_err(|e| format!("Network request failed: {:?}", e))?;
+        
+        let resp: Response = resp_value
+            .dyn_into()
+            .map_err(|e| format!("Response cast failed: {:?}", e))?;
+        
+        if resp.ok() {
+            Ok(())
+        } else {
+            Err(format!("Failed to update preferences: {}", resp.status()))
+        }
+    }
+    
+    /// Migrate preferences from LocalStorage to backend (on first login after update)
+    pub async fn migrate_from_local_storage(&self) -> Result<(), String> {
+        let session_token = LocalStorage::get::<String>("session_token")
+            .map_err(|_| "No session token found".to_string())?;
+        
+        let mut request = UpdatePreferencesRequest {
+            calendar_selected_date: LocalStorage::get::<String>("calendar_selected_date").ok(),
+            calendar_time_increment: LocalStorage::get::<u32>("calendar_time_increment").ok().map(|i| i as i32),
+            calendar_view_mode: LocalStorage::get::<String>("calendar_view_mode").ok(),
+            calendar_theme: LocalStorage::get::<String>("calendar_theme").ok(),
+            calendar_colors: LocalStorage::get::<String>("calendar_colors").ok(),
+        };
+        
+        // Only migrate if we have some preferences to migrate
+        if request.calendar_selected_date.is_some()
+            || request.calendar_time_increment.is_some()
+            || request.calendar_view_mode.is_some()
+            || request.calendar_theme.is_some()
+            || request.calendar_colors.is_some()
+        {
+            self.sync_preferences(&session_token, &request).await?;
+            
+            // Clear old LocalStorage entries after successful migration
+            let _ = LocalStorage::delete("calendar_selected_date");
+            let _ = LocalStorage::delete("calendar_time_increment");
+            let _ = LocalStorage::delete("calendar_view_mode");
+            let _ = LocalStorage::delete("calendar_theme");
+            let _ = LocalStorage::delete("calendar_colors");
+        }
+        
+        Ok(())
+    }
+}

frontend/styles.css

@@ -289,6 +289,30 @@ body {
     cursor: not-allowed;
 }
 
+.remember-checkbox {
+    display: flex;
+    align-items: center;
+    gap: 0.375rem;
+    margin-top: 0.375rem;
+    opacity: 0.7;
+}
+
+.remember-checkbox input[type="checkbox"] {
+    width: auto;
+    margin: 0;
+    cursor: pointer;
+    transform: scale(0.85);
+}
+
+.remember-checkbox label {
+    margin: 0;
+    font-size: 0.75rem;
+    color: #888;
+    cursor: pointer;
+    user-select: none;
+    font-weight: 400;
+}
+
 .login-button, .register-button {
     width: 100%;
     padding: 0.75rem;