This commit resolves the "Failed to fetch" errors when updating recurring
event series through drag operations by implementing proper request
sequencing and fixing time parameter handling.
Key fixes:
- Eliminate HTTP request cancellation by sequencing operations properly
- Add global mutex to prevent CalDAV HTTP race conditions
- Implement complete RFC 5545-compliant series splitting for "this_and_future"
- Fix frontend to pass dragged times instead of original times
- Add comprehensive error handling and request timing logs
- Backend now handles both UPDATE (add UNTIL) and CREATE (new series) in single request
Technical changes:
- Frontend: Remove concurrent CREATE request, pass dragged times to backend
- Backend: Implement full this_and_future logic with sequential operations
- CalDAV: Add mutex serialization and detailed error tracking
- Series: Create new series with occurrence date + dragged times
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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