feat(audit): nightly retention purge for audit_log rows#49
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Adds a per-organisation purge that respects each tenant's audit_retention_days. Runs nightly at 03:00 Australia/Sydney as an Inngest cron (one hour after the existing PII scrub) and deletes in batches of 10k so it never holds a long lock on audit_log. Per-org counts are emitted via structured logs so operators can confirm what was removed.
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Summary
Closes #41. The
audit_logtable and per-tenantorganisations.audit_retention_dayscolumn already shipped in #42; this adds the deletion job that respects them.lib/audit/purge.tswithpurgeAuditLogsForOrganisationandpurgeExpiredAuditLogs.WITH target_rows AS (... LIMIT ...) DELETE ...) so we never hold a long lock onaudit_log.[audit-purge] org=… retention=…d cutoff=… deleted=… batches=…).audit-log-retention-purgeregistered alongsideeventRetentionSweepand scheduled at0 3 * * *Australia/Sydney — 30 min after the existing PII scrub so the two jobs don't fight for the table.Test plan
created_atstraddling the cutoff, runpurgeAuditLogsForOrganisation, confirm only rows older than the org's retention window are removed.audit-log-retention-purgeregistered after deploy.https://claude.ai/code/session_01PiiqDRQJdW1sBLvEmZ3GBC
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