fixed deduplication once again. for real this time I think

src/library.rs

@@ -60,11 +60,15 @@ impl fmt::Display for LibrarySummary {
 }
 
 /// Add an artist to the watchlist by expanding into individual track wanted items.
+///
+/// `allowed_secondary_types` filters release groups by secondary type (e.g., Compilation, Live).
+/// An empty slice means studio releases only.
 pub async fn add_artist(
     conn: &DatabaseConnection,
     name: Option<&str>,
     musicbrainz_id: Option<&str>,
     provider: &impl MetadataProvider,
+    allowed_secondary_types: &[String],
     user_id: Option<i32>,
 ) -> WatchResult<AddSummary> {
     let (resolved_name, resolved_mbid) =
@@ -91,14 +95,31 @@ pub async fn add_artist(
 
     tracing::info!(name = %resolved_name, mbid = %artist_mbid, "fetching discography (release groups)");
 
-    let release_groups = provider
+    let all_release_groups = provider
         .get_artist_release_groups(&artist_mbid)
         .await
         .map_err(|e| WatchError::Other(format!("failed to fetch release groups: {e}")))?;
 
+    // Only include release groups where this artist is the primary credit,
+    // filtered by allowed secondary types (same as the artist detail page)
+    let release_groups: Vec<_> = all_release_groups
+        .into_iter()
+        .filter(|rg| !rg.featured)
+        .filter(|rg| {
+            if rg.secondary_types.is_empty() {
+                true
+            } else {
+                rg.secondary_types
+                    .iter()
+                    .all(|st| allowed_secondary_types.contains(st))
+            }
+        })
+        .collect();
+
     tracing::info!(count = release_groups.len(), "found release groups");
 
     let mut summary = AddSummary::default();
+    let mut seen_mbids: std::collections::HashSet<String> = std::collections::HashSet::new();
 
     for rg in &release_groups {
         // Resolve a concrete release MBID from the release group
@@ -128,6 +149,9 @@ pub async fn add_artist(
         };
 
         for track in &tracks {
+            if !seen_mbids.insert(track.recording_mbid.clone()) {
+                continue; // Already processed this recording in another release group
+            }
             match add_track_inner(
                 conn,
                 &resolved_name,
@@ -277,6 +301,17 @@ async fn add_track_inner(
     artist_mbid: Option<&str>,
     user_id: Option<i32>,
 ) -> WatchResult<bool> {
+    // Skip if a wanted_item with this recording MBID already exists
+    if let Some(mbid) = recording_mbid {
+        if queries::wanted::find_by_mbid(conn, mbid)
+            .await?
+            .is_some()
+        {
+            tracing::debug!(title = title, mbid = mbid, "already in watchlist, skipping");
+            return Ok(false);
+        }
+    }
+
     let artist = queries::artists::upsert(conn, artist_name, artist_mbid).await?;
     let is_owned = matching::track_is_owned(conn, artist_name, title).await?;