fix(installer): audit credential retirement

src/govoplan_addresses/backend/service.py

@@ -417,6 +417,25 @@ def _record_sync_credential_deletion_audit(
     return True
 
 
+def audit_address_credentials_for_retirement(session: Session) -> int:
+    """Audit credentials that the ensuing destructive table drop deletes."""
+
+    sources = session.query(AddressSyncSource).order_by(AddressSyncSource.id.asc()).all()
+    audited = 0
+    for source in sources:
+        if _record_sync_credential_deletion_audit(
+            session,
+            sync_source=source,
+            tenant_id=source.tenant_id,
+            user_id=None,
+            api_key_id=None,
+            deletion_reason="module_data_retired",
+        ):
+            audited += 1
+    session.flush()
+    return audited
+
+
 def start_sync_attempt(session: Session, principal: ApiPrincipal, sync_source_id: str) -> AddressSyncSource:
     sync_source = get_visible_sync_source(session, principal, sync_source_id)
     if not sync_source.enabled: