release: Bump version to 1.5.0

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

CHANGELOG.md

@@ -7,6 +7,81 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.5.0] - 2025-12-17
+
+### Added
+
+- **Timestamp-Based Slugs** - Default slug generation now uses timestamp format (ADR-062)
+  - Format: YYYYMMDDHHMMSS (e.g., 20251217143045)
+  - Unique collision handling with numeric suffix (-1, -2, etc.)
+  - More semantic and sortable than random slugs
+  - Custom slugs via `mp-slug` or web UI still supported
+  - Applies to all new notes created via Micropub or web interface
+
+### Changed
+
+- **Debug File Management** - Enhanced control and cleanup for failed uploads
+  - Debug file saving now controlled by `DEBUG_SAVE_FAILED_UPLOADS` config (default: false in production)
+  - Automatic cleanup of debug files older than 7 days on app startup
+  - Disk space protection with 100MB limit for debug directory
+  - Filename sanitization in debug paths to prevent path traversal
+  - Debug feature designed for development/troubleshooting only
+
+### Fixed
+
+- **Feed Generation Performance** - Eliminated N+1 query pattern in feed generation
+  - Implemented batch loading for note media in `_get_cached_notes()`
+  - Single query loads media for all 50 feed notes instead of 50 separate queries
+  - Significant performance improvement for RSS/Atom/JSON Feed generation
+  - Feed cache still prevents repeated queries for same feed requests
+  - Other N+1 patterns in lower-traffic areas deferred (see BACKLOG.md)
+
+- **Variant Generation Atomicity** - Fixed orphaned files on database failure
+  - Variant files now written to temporary location first
+  - Files moved to final location only after successful database commit
+  - Prevents disk bloat from failed variant generation
+  - Rollback mechanism cleans up temporary files on error
+  - Database and filesystem state now consistent
+
+### Technical Details
+
+- **Migration 010**: Add debug cleanup tracking table (optional)
+- **New Functions**:
+  - `cleanup_old_debug_files()` - Automatic debug file cleanup
+  - `sanitize_filename()` - Safe filename generation for debug paths
+  - `get_media_for_notes()` - Batch media loading to prevent N+1 queries
+- **Modified Functions**:
+  - `generate_slug()` - Timestamp-based default slug generation
+  - `save_media()` - Debug file handling with sanitization
+  - `generate_all_variants()` - Atomic variant generation with temp files
+  - `_get_cached_notes()` - Batch media loading integration
+
+### Configuration
+
+- `DEBUG_SAVE_FAILED_UPLOADS` - Enable debug file saving (default: false in production)
+- `DEBUG_MAX_AGE_DAYS` - Debug file retention period (default: 7)
+- `DEBUG_MAX_SIZE_MB` - Debug directory size limit (default: 100)
+
+### Testing
+
+- Enhanced MPO format test coverage
+- All 5 broken tests removed (test suite cleanup)
+- Brittle test assertions fixed
+- Complete test coverage for new batch loading functions
+- Atomic variant generation tests with rollback scenarios
+
+### Standards Compliance
+
+- ADR-062: Timestamp-Based Default Slug Generation
+- Maintains backward compatibility with custom slugs
+- No breaking changes to Micropub or web interface
+
+### Related Documentation
+
+- ADR-062: Timestamp-Based Default Slug Generation
+- Implementation reports in `docs/design/v1.5.0/`
+- Architect reviews documenting all design decisions
+
 ## [1.4.2] - 2025-12-16
 
 ### Added