docs: integrate plaintext PostgreSQL decision

.project-docs/90-maintenance/stale-items.md

@@ -9,7 +9,10 @@ This is the integrated registry of stale or conflicting canonical memory. Update
 
 ## Missing Context
 
-- RDS deployment inputs (target version, connection budget, endpoint, TLS/CA bundle, database roles, ACK network policy) — needed before production validation.
+- RDS deployment inputs (target version, connection budget, exact internal
+  endpoint, database roles, effective VPC/security-group/RDS allowlist policy)
+  — needed before production validation of the intentionally plaintext
+  connection.
 - Real OSS bucket/credential configuration — needed before horizontal scaling or Go asset validation.
 - The public `/api/v1` support promise for external consumers — needed before the first production deployment.