Refactor: Approve test data generator tool use

supabase/migrations/20251010164045_dd0baeac-d6a3-449c-b42a-0a1e5ba48df3.sql

@@ -0,0 +1,10 @@
+-- Add submission_item_id to test_data_registry for proper dependency tracking
+ALTER TABLE test_data_registry 
+  ADD COLUMN IF NOT EXISTS submission_item_id UUID REFERENCES submission_items(id) ON DELETE CASCADE;
+
+-- Add index for fast lookups
+CREATE INDEX IF NOT EXISTS idx_test_data_registry_item_id 
+  ON test_data_registry(submission_item_id);
+
+-- Update existing records to have NULL submission_item_id (for backwards compatibility)
+-- New records will populate this field