fix: notify when a resource is retyped to an internal type

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

backend/migrations/20260924065755_mcp_tools_change_notify.up.sql

@@ -59,7 +59,7 @@ EXECUTE FUNCTION notify_mcp_tools_change();
 CREATE TRIGGER resource_mcp_tools_update_trigger
 AFTER UPDATE OF path, resource_type, description ON resource
 FOR EACH ROW
-WHEN (NEW.resource_type NOT IN ('cache', 'state')
+WHEN ((OLD.resource_type NOT IN ('cache', 'state') OR NEW.resource_type NOT IN ('cache', 'state'))
     AND (OLD.path IS DISTINCT FROM NEW.path
         OR OLD.resource_type IS DISTINCT FROM NEW.resource_type
         OR OLD.description IS DISTINCT FROM NEW.description))

backend/windmill-store/src/resources.rs

@@ -1075,7 +1075,8 @@ async fn check_path_conflict<'c>(
 /// Resource types the platform writes on its own behalf rather than users editing them:
 /// `state` backs `setState` and `cache` backs cached job results, so both are rewritten on
 /// every job run. Workspace export skips them for the same reason the `record_resource_version`
-/// trigger does; that trigger repeats this list in SQL, so the two have to move together.
+/// trigger does; that trigger and the `notify_mcp_tools_change` resource triggers repeat this
+/// list in SQL, so they have to move together.
 pub const INTERNAL_RESOURCE_TYPES: [&str; 2] = ["state", "cache"];
 
 /// Versions retained per resource path. The monitor sweep enforces it eventually; the history