- Added a new validation class to ensure that trigger nodes do not coexist with UserInput (start) nodes in the workflow graph.
- Implemented a method in WorkflowService to validate the graph structure before persisting workflows, leveraging the new validation logic.
- Updated unit tests to cover the new validation scenarios and ensure proper error propagation.
Added a timestamp field to the SystemVariable model and updated the WorkflowAppRunner to include the current timestamp during execution. Enhanced node type checks to recognize trigger nodes in various services, ensuring proper handling of system variables and node outputs in TriggerEventNode and TriggerScheduleNode. This improves the overall workflow execution context and maintains consistency across node types.
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