Notification from sqlite3_log()

SQLITE_NOTICE (27) is an informational code passed to the sqlite3_log() error-logger callback to indicate routine notifications such as WAL autocheckpoints and database recovery.

1. 1WAL auto-checkpoint completed.
2. 2Database recovered from a journal after a crash.
3. 3Informational message from an extension or VFS.

sqlite3_log() callback; not returned by API functions — only seen in log output.

# In C, register a logger:
# sqlite3_config(SQLITE_CONFIG_LOG, myLogCallback, 0);
# SQLITE_NOTICE will appear for WAL checkpoints and recovery events

Log message: "recovered N frames from WAL file ..." with code SQLITE_NOTICE.

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