Replace recursive directory traversal with first-level-only symlink scanning
to fix severe performance issues on large model collections (220K+ files).
- Rename _scan_directory_links to _scan_first_level_symlinks
- Only scan symlinks directly under each root directory
- Skip traversal of normal subdirectories entirely
- Update tests to reflect first-level behavior
- Add test_deep_symlink_not_scanned to document intentional limitation
Startup time reduced from 15+ minutes to seconds for affected users.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Centralize cache path resolution in new py/utils/cache_paths.py module
- Migrate legacy cache files to organized structure: {settings_dir}/cache/{model|recipe|fts|symlink}/
- Automatically clean up legacy files after successful migration with integrity verification
- Update Config symlink cache to use new path and migrate from old location
- Simplify service classes (PersistentModelCache, PersistentRecipeCache, RecipeFTSIndex, TagFTSIndex) to use centralized migration logic
- Add comprehensive test coverage for cache paths and automatic cleanup
Detects symlink changes at any depth, not just at root level. Uses two-tier validation:
- Fingerprint check for new symlinks
- Deep mapping validation for removed/retargeted symlinks
- Add `_entry_is_symlink` method to detect symlinks and Windows junctions
- Include first-level symlinks in fingerprint for better cache invalidation
- Re-enable preview path validation for security
- Update tests to verify retargeted symlinks trigger rescan
Add `_seed_root_symlink_mappings` method to ensure symlinked root folders are recorded before deep scanning, preventing them from being missed during directory traversal. This ensures that root symlinks are properly captured in the path mappings.
Additionally, normalize separators in relative paths for cross-platform consistency in `BaseModelService`, and update tests to verify root symlinks are preserved in the cache.
- Added threading import and optional `_rescan_thread` for background operations
- Simplified `_load_symlink_cache` to only validate path mappings, removing fingerprint checks
- Updated `_initialize_symlink_mappings` to rebuild preview roots and schedule rescan when cache is loaded
- Added `_schedule_symlink_rescan` method to perform background validation of symlinks
- Cleared `_path_mappings` at start of `_scan_symbolic_links` to prevent stale entries
- Background rescan improves performance by deferring symlink validation after cache load
