diff --git a/docs/runbook/legacy-instances-20261107.md b/docs/runbook/legacy-instances-20261107.md
new file mode 100644
index 0000000..7358857
--- /dev/null
+++ b/docs/runbook/legacy-instances-20261107.md
@@ -0,0 +1,47 @@
+# Legacy instance audit — 0pt (server5) and L0RE (server5) — 2026-11-07
+
+Canonical runtimes: **0pt on server6** (Coolify app `shxd6lepxuxfsjsp0ath3z1g`,
+`0pt.app`) and **L0RE on server9** (`l0re.siax.io`). This document records the
+older instances on server5 and their disposition. It is not production
+documentation for either product.
+
+## 1. 0pt legacy (server5)
+
+| Item | Value |
+|---|---|
+| Containers | `0pt-api` (`0pt-api:c46ebbf`, created 2026-11-05), `0pt-web` (`:18080`) |
+| Database | `0pt-pg`, user/db `opt`, 11 MB |
+| Exposure | `0pt-web` only on `100.124.7.55:18080`; no DNS record, no reverse proxy |
+| Consumers | none found (`/etc/siax`, `/opt/siax`, site0 and L0RE deploy configs) |
+| Unique data | 32 canonical facts (30 GLEIF web observations + `body_type` YDL405 + `passmark.find_prime_numbers.v10`) |
+
+**Data reconciliation:** all 32 facts were exported and re-imported through the
+canonical API (`POST /api/0pt/canonical/facts`) into the server6 deployment.
+Replay returned `duplicates: 32`, so the import is idempotent. Production now
+holds 34 facts (32 migrated + 2 verification observations) and 4 entities.
+
+**Backup:** `server5:/var/backups/0pt-legacy/opt_legacy_20261107.dump.zst`
+(custom format, 32 KB) + offsite `server11:/home/backup/0pt/`.
+
+**Action taken:** `docker update --restart=no` + `docker stop` for `0pt-api` and
+`0pt-web`. `0pt-pg` left running for forensics/rollback. `0pt.app` verified 200
+after the stop (served by server6).
+
+**Full removal (requires owner decision):** snapshot/destroy `0pt-pg` volume
+after the retention window, remove the legacy compose project, revoke the old
+`INTERNAL_TOKEN` if it was ever stored on server5.
+
+## 2. L0RE orphan (server5)
+
+Documented separately in `admin/l0re` PR #485
+(`docs/runbook/l0re-orphan-decommission-20261107.md`): API stopped with
+`restart=no`, dump + restore proof (8 propositions/62 assertions), no unique
+legitimate data (pilot facts already re-projected to production). `l0re-pg` and
+`l0re-opensearch` remain for forensics.
+
+## 3. Single-runtime rule
+
+One primary runtime per logical service. A container image of a product running
+outside its registered Coolify app is a finding, not a fallback. Both server5
+instances were reachable only from the host, which is why the split survived
+until this audit.
diff --git a/sql/023_canonical_grants.sql b/sql/023_canonical_grants.sql
index 8fe96b2..fb5dd0e 100644
--- a/sql/023_canonical_grants.sql
+++ b/sql/023_canonical_grants.sql
@@ -13,7 +13,7 @@ BEGIN
   IF EXISTS (SELECT 1 FROM pg_roles WHERE rolname = '0pt_app') THEN
     GRANT SELECT, INSERT, UPDATE, DELETE
       ON opt_canonical_entities, opt_canonical_facts, opt_canonical_relations
-      TO 0pt_app;
+      TO "0pt_app";
   END IF;
 END
 $$;
diff --git a/src/repositories/canonical-fact-repository.ts b/src/repositories/canonical-fact-repository.ts
index 4e22ed7..3c13a7a 100644
--- a/src/repositories/canonical-fact-repository.ts
+++ b/src/repositories/canonical-fact-repository.ts
@@ -30,6 +30,11 @@ export interface CanonicalFactRepository {
   queryFacts(query: CanonicalQuery): Promise<CanonicalFact[]>;
 }
 
+/** PostgreSQL timestamptz arrives as Date; the API contract is RFC3339/ISO-8601. */
+function iso(value: unknown): string {
+  return value instanceof Date ? value.toISOString() : String(value);
+}
+
 export function entityKey(e: CanonicalEntityInput): string {
   return `${e.entity_type}\u0000${e.identity_namespace}\u0000${e.identity_value}`;
 }
@@ -216,11 +221,11 @@ class PostgresCanonicalFactRepository implements CanonicalFactRepository {
         source_record_id: r.source_record_id ?? undefined,
         st0re_artifact_id: r.st0re_artifact_id ?? undefined,
         aud0_evidence_ref: r.aud0_evidence_ref ?? undefined, run_ref: r.run_ref ?? undefined,
-        extractor_version: r.extractor_version, observed_at: String(r.observed_at),
-        valid_from: r.valid_from ? String(r.valid_from) : undefined,
-        valid_to: r.valid_to ? String(r.valid_to) : undefined,
+        extractor_version: r.extractor_version, observed_at: iso(r.observed_at),
+        valid_from: r.valid_from ? iso(r.valid_from) : undefined,
+        valid_to: r.valid_to ? iso(r.valid_to) : undefined,
         confidence: r.confidence === null ? undefined : Number(r.confidence),
-        quality_status: r.quality_status, status: r.status, created_at: String(r.created_at),
+        quality_status: r.quality_status, status: r.status, created_at: iso(r.created_at),
       })) as CanonicalFact[];
     });
   }