Resolves issue where CWA hangs when editing metadata and cover
simultaneously, particularly on network shares or when NETWORK_SHARE_MODE
is enabled.
Changes:
- Increase SQLite connection timeout from 30s to 60s throughout
cover_enforcer.py to handle slower network share operations
- Add retry logic with exponential backoff (3 attempts) to calibredb
export, specifically handling "database is locked" errors
- Replace os.system() with subprocess.run() for ebook-polish operations:
* Better error handling and logging
* 120s timeout to prevent indefinite hangs
* Capture stderr/stdout for debugging
- Add 0.5s delay before ebook-polish execution to ensure file buffers
are flushed and locks released
- Explicit database connection closure before file modification operations
All changes occur in background service; no UI impact.
Fixes#904
crocodilestick
fa2f2f70c2