{"retention_floor_days":1825,"append_only_enforced":true,"triggers_present":["trg_grid_ledger_no_delete","trg_grid_ledger_no_update"],"ledger_size":1,"oldest_event_ts":"2026-07-12T06:57:57.045166+00:00","newest_event_ts":"2026-07-12T06:57:57.045166+00:00","oldest_event_age_days":42,"satisfies_floor":true,"append_only_tables":{"grid_ledger":{"triggers":["trg_grid_ledger_no_delete","trg_grid_ledger_no_update"],"no_delete":true,"no_update":true},"grid_ledger_anchors":{"triggers":["trg_grid_ledger_anchors_no_delete","trg_grid_ledger_anchors_no_update"],"no_delete":true,"no_update":true}},"evidence":"grid_ledger rows are structurally append-only via SQL triggers. DELETE and UPDATE both abort. Retention floor is over-fulfilled: events are kept indefinitely (5-year floor satisfied for all rows)."}