feat(bell): add immutable event store [T-015]

deploy/postgres/tests/assertions.sql

@@ -71,11 +71,33 @@ BEGIN
        OR NOT has_table_privilege('sense_app', 'sense.device_operation_outbox', 'DELETE') THEN
         RAISE EXCEPTION 'sense_app lacks access to its local audit Outbox';
     END IF;
-    IF (SELECT max(version) FROM bell.schema_migrations) <> 2
+    IF (SELECT max(version) FROM bell.schema_migrations) <> 3
        OR (SELECT max(version) FROM sense.schema_migrations) <> 5 THEN
         RAISE EXCEPTION 'schema migration version drift';
     END IF;
 
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_roles
+        WHERE rolname = 'bell_runtime' AND NOT rolcanlogin AND NOT rolsuper
+          AND NOT rolcreatedb AND NOT rolcreaterole AND NOT rolreplication
+    ) THEN
+        RAISE EXCEPTION 'bell_runtime role is missing or unsafe';
+    END IF;
+    IF NOT has_table_privilege('yovision_t015_bell', 'bell.events', 'SELECT,INSERT')
+       OR NOT has_table_privilege('yovision_t015_bell', 'bell.event_outcomes', 'SELECT,INSERT')
+       OR has_table_privilege('yovision_t015_bell', 'bell.events', 'UPDATE')
+       OR has_table_privilege('yovision_t015_bell', 'bell.events', 'DELETE')
+       OR has_table_privilege('yovision_t015_bell', 'bell.events', 'TRUNCATE')
+       OR has_table_privilege('yovision_t015_bell', 'bell.event_outcomes', 'UPDATE')
+       OR has_table_privilege('yovision_t015_bell', 'bell.event_outcomes', 'DELETE')
+       OR has_table_privilege('yovision_t015_bell', 'bell.event_outcomes', 'TRUNCATE') THEN
+        RAISE EXCEPTION 'Bell runtime violates immutable event privileges';
+    END IF;
+    IF has_table_privilege('public', 'bell.events', 'SELECT,INSERT,UPDATE,DELETE,TRUNCATE')
+       OR has_table_privilege('public', 'bell.event_outcomes', 'SELECT,INSERT,UPDATE,DELETE,TRUNCATE') THEN
+        RAISE EXCEPTION 'Bell event facts leaked to PUBLIC';
+    END IF;
+
     INSERT INTO bell.sites(tenant_id, id, name)
     VALUES ('assertion-tenant', 'assertion-site', 'Assertion Site')
     RETURNING max_video_channels, version INTO default_quota, initial_version;