fix: enforce durable migration ownership and readiness

hub_core/runtime/postgres_store.py

@@ -22,6 +22,8 @@ from hub_core.runtime.models import (
     RegistryRegistration,
 )
 from hub_core.runtime.tables import (
+    compat_api_keys,
+    compat_hubs,
     runtime_audit_ledger,
     runtime_interaction_events,
     runtime_messages,
@@ -47,6 +49,13 @@ class PostgresPortStore:
         try:
             async with self.engine.connect() as connection:
                 await connection.execute(sa.text("SELECT 1"))
+                # A live connection alone can hide a mis-granted runtime lease.
+                # Exercise the durable port, compatibility, and authorization
+                # tables that protected traffic actually depends on.
+                for table in (runtime_audit_ledger, compat_hubs, compat_api_keys):
+                    await connection.execute(
+                        sa.select(sa.literal(1)).select_from(table).limit(1)
+                    )
         except Exception:
             return {"database": "unavailable"}
         return {"database": "ok"}