refactor: Use limit to prevent fetching all records

packages/backend/src/models/flow.ts

@@ -91,6 +91,7 @@ class Flow extends Base {
   async lastInternalId() {
     const lastExecution = await this.$relatedQuery('executions')
       .orderBy('created_at', 'desc')
+      .limit(1)
       .first();
 
     return lastExecution ? (lastExecution as Execution).internalId : null;