The database runs in WAL mode, so a shutil.copy2 of prompts.db silently
dropped every committed row still in prompts.db-wal; the backup
download and the pre-restore safety copy both did that. Restore also
overwrote the live file with connections open, read the whole upload
into memory before checking the 100 MB cap and never ran
PRAGMA integrity_check.
PromptModel.backup_database now uses the SQLite online backup API,
verify_database_file opens a candidate read-only and checks header,
integrity and the prompts table, and restore_from_file backs up the
live database, closes every thread's connection, copies the file,
removes stale -wal/-shm and re-runs migrations. The admin handlers
stream the upload to a temp file with an early size cutoff, reject
anything verify_database_file refuses with a 400 and keep the
{success: ...} JSON shape. The schema-init connection is now closed
instead of leaking.
Vito Sansevero
b5720904cd