PostgreSQL UPDATE...FROM does not allow the updated table to be
referenced inside the FROM clause's JOIN conditions. Replace the
LEFT JOIN psa_connections with a correlated subquery.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
psa_post_log: backfill via psa_connection, fallback to posted_by user
psa_member_mappings: backfill via psa_connection
notification_logs: backfill via notification_config
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>