I don?t run pragma quick_check in my application ? and I don?t have any corrupted database here. I only ever see the log files when my application reports a damaged application, and there I see the ?disk image malformed? error message.
The diagnosis routine included in my application and which runs weekly by default performs logical tests on the data stored in the database, but also low-level tests like pragma integrity_check to ensure the SQLite database is physically correct. Either the damage is discovered here (in these cases I dump the first 100 rows returned by integrity_check into the log file) or during normal operation, e.g. while opening a database.
