Record created/joined/triggered/delivered/destroyed with SHA-256 hashes of the alert and user UUIDs only, and a reason on destruction. The earlier analytics and stdout-mirror tables were superseded by the user ruling, so 009 creates alarm.event_log, migrates what still applies and drops both, leaving exactly one durable table with no network identifiers, token, body or query string. Retention is age-based via the sweeper.
