diff --git a/docs/implplan/SPRINT_20260408_004_Timeline_unified_audit_sink.md b/docs/implplan/SPRINT_20260408_004_Timeline_unified_audit_sink.md
index 69b8da07c..6b5508aea 100644
--- a/docs/implplan/SPRINT_20260408_004_Timeline_unified_audit_sink.md
+++ b/docs/implplan/SPRINT_20260408_004_Timeline_unified_audit_sink.md
@@ -110,7 +110,7 @@ PII found in audit records:
 ## Delivery Tracker
 
 ### AUDIT-001 - PostgreSQL persistence for Timeline audit ingest
-Status: TODO
+Status: DONE
 Dependency: none
 Owners: Developer (backend)
 Task description:
@@ -250,6 +250,7 @@ Completion criteria:
 | Date (UTC) | Update | Owner |
 | --- | --- | --- |
 | 2026-04-08 | Sprint created from deep audit landscape investigation. Catalogued 16+ independent audit implementations across the monorepo. | Planning |
+| 2026-04-08 | AUDIT-001 implemented: created 20260408_003_unified_audit_events.sql migration (table + sequences + chain functions), PostgresUnifiedAuditEventStore with SHA-256 hash chain, updated CompositeUnifiedAuditEventProvider to read from Postgres, wired AddStartupMigrations in Program.cs. Build passes with 0 errors. | Developer |
 
 ## Decisions & Risks