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07ab902604
Closes the dev-ops lens's #1 finding from the library charrette (got-feedback/feedBack#636 item 1): scores, favorites, playlists, and play history — the only library state a rescan can't rebuild — were absent from the settings backup. Now GET /api/settings/export carries an additive `core_server_files` section: - a CONSISTENT snapshot of web_library.db via the SQLite online-backup API (a complete single file even while the server runs; taken under the MetadataDB write lock), base64-encoded; - custom playlist covers + avatar (CONFIG_DIR/playlist_covers, /avatars), walked with the existing _walk_export_paths machinery. Restore is DB-safe: - POST /api/settings/import STAGES the DB to web_library.db.restore (never over the live, open file); _apply_pending_db_restore swaps it in at the next startup BEFORE the connection opens, clearing stale -wal/-shm so a stale WAL can't be replayed onto the restored file. Response sets `restart_required` + a warning; custom art applies immediately. - The staged DB is integrity-checked (open + PRAGMA quick_check) at import AND again at startup before the live DB is touched — a corrupt/truncated restore is refused/discarded and the live DB is left intact, so a bad bundle can never brick startup or lose data. - Export hard-fails (500) if the snapshot can't be produced (no silent DB-less backup); a partial import disarms its own staged restore. Backward-compatible: older servers ignore the new section; a bundle without it imports as before. Known gap: custom uploaded *song* art is still commingled with the rebuildable thumbnail cache in art_cache/, so it isn't bundled yet (tracked follow-up on #636). Tests: tests/test_settings_export_library_db.py (snapshot consistency, staged-not-live restore, sidecar clearing, corrupt-DB refusal at import + startard, traversal rejection, export hard-fail, disarm-on-failure, full round-trip). Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>