fix(api): add trigger_info to WorkflowNodeExecutionMetadataKey

[QuantumGhost]

Summary

This PR fixes a NodeRunResult.metadata validation failure caused by the trigger plugin node writing trigger_info as a metadata key before that key was registered in WorkflowNodeExecutionMetadataKey.

It also removes the standalone TRIGGER_INFO_METADATA_KEY constant and standardizes all trigger metadata access through WorkflowNodeExecutionMetadataKey.TRIGGER_INFO.

Root Cause

NodeRunResult.metadata is validated against WorkflowNodeExecutionMetadataKey.

The trigger plugin node wrote:

• trigger_info

but WorkflowNodeExecutionMetadataKey did not include that value yet.

As a result, Pydantic rejected the metadata payload when constructing NodeRunResult, causing workflow execution to fail for trigger plugin nodes.

Changes

Fix metadata validation

• Add TRIGGER_INFO to WorkflowNodeExecutionMetadataKey
• Update trigger plugin node metadata writing to use WorkflowNodeExecutionMetadataKey.TRIGGER_INFO

Standardize metadata key usage

• Replace remaining usages of TRIGGER_INFO_METADATA_KEY with WorkflowNodeExecutionMetadataKey.TRIGGER_INFO
• Remove the TRIGGER_INFO_METADATA_KEY constant from core.trigger.constants

Tests

• Add a minimal model-level test to verify NodeRunResult accepts trigger metadata under WorkflowNodeExecutionMetadataKey.TRIGGER_INFO
• Keep a trigger plugin node regression test to verify the node populates trigger metadata correctly

Fix #33754

Screenshots

Before	After
	...

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the handling of trigger event information within the workflow execution metadata. It introduces a new, explicit enum member for trigger details, ensuring a standardized and type-safe approach to storing this critical data. The changes improve code clarity and maintainability by removing unnecessary type casting and are backed by new unit tests to validate the correct behavior.

Highlights

• Standardized Trigger Info Metadata: Introduced a dedicated TRIGGER_INFO member to the WorkflowNodeExecutionMetadataKey enum for consistent storage of trigger event details.
• Refactored Trigger Event Node: Updated the TriggerEventNode to directly use the new TRIGGER_INFO enum member, removing a type cast.
• Enhanced Documentation: Added a docstring to WorkflowNodeExecutionMetadataKey to clarify that its values are persisted and must remain in sync.
• Comprehensive Testing: Added new unit tests to ensure the TriggerEventNode correctly populates TRIGGER_INFO metadata and that NodeRunResult properly accepts this metadata.

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[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-03-19 09:26:28.513816537 +0000
+++ /tmp/pyrefly_pr.txt	2026-03-19 09:26:18.563694658 +0000
@@ -5249,6 +5249,8 @@
    --> tests/unit_tests/core/workflow/nodes/tool/test_tool_node.py:105:22
 ERROR Argument `Generator[NodeEventBase, None, LLMUsage]` is not assignable to parameter `generator` with type `Generator[Unknown]` in function `_collect_events` [bad-argument-type]
    --> tests/unit_tests/core/workflow/nodes/tool/test_tool_node.py:113:32
+ERROR Cannot index into `Mapping[WorkflowNodeExecutionMetadataKey, Any]` [bad-index]
+  --> tests/unit_tests/core/workflow/nodes/trigger_plugin/test_trigger_event_node.py:59:28
 ERROR Argument `dict[str, dict[str, WriteMode | list[str] | str] | str]` is not assignable to parameter `config` with type `NodeConfigDict` in function `dify_graph.nodes.variable_assigner.v1.node.VariableAssignerNode.__init__` [bad-argument-type]
    --> tests/unit_tests/core/workflow/nodes/variable_assigner/v1/test_variable_assigner_v1.py:107:16
 ERROR Argument `dict[str, dict[str, WriteMode | list[str] | str] | str]` is not assignable to parameter `config` with type `NodeConfigDict` in function `dify_graph.nodes.variable_assigner.v1.node.VariableAssignerNode.__init__` [bad-argument-type]
@@ -5387,6 +5389,10 @@
    --> tests/unit_tests/dify_graph/model_runtime/utils/test_encoders.py:153:59
 ERROR No matching overload found for function `compile` called with arguments: (Literal['abc']) [no-matching-overload]
    --> tests/unit_tests/dify_graph/model_runtime/utils/test_encoders.py:181:40
+ERROR Argument `dict[str, Any]` is not assignable to parameter `metadata` with type `Mapping[WorkflowNodeExecutionMetadataKey, Any]` in function `dify_graph.node_events.base.NodeRunResult.__init__` [bad-argument-type]
+  --> tests/unit_tests/dify_graph/node_events/test_base.py:9:18
+ERROR Cannot index into `Mapping[WorkflowNodeExecutionMetadataKey, Any]` [bad-index]
+  --> tests/unit_tests/dify_graph/node_events/test_base.py:17:28
 ERROR Object of class `int` has no attribute `startswith` [missing-attribute]
   --> tests/unit_tests/extensions/otel/test_celery_sqlcommenter.py:25:16
 ERROR Cannot index into `object` [bad-index]

[gemini-code-assist]

Code Review

This pull request refactors the metadata key for trigger information into the WorkflowNodeExecutionMetadataKey enum, which improves type safety and code consistency. The changes are well-implemented, and new tests have been added to cover them. My feedback focuses on updating the new tests to use the newly introduced enum member for better consistency with the refactoring.

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-03-19 09:28:27.337761361 +0000
+++ /tmp/pyrefly_pr.txt	2026-03-19 09:28:18.061753762 +0000
@@ -5249,6 +5249,8 @@
    --> tests/unit_tests/core/workflow/nodes/tool/test_tool_node.py:105:22
 ERROR Argument `Generator[NodeEventBase, None, LLMUsage]` is not assignable to parameter `generator` with type `Generator[Unknown]` in function `_collect_events` [bad-argument-type]
    --> tests/unit_tests/core/workflow/nodes/tool/test_tool_node.py:113:32
+ERROR Cannot index into `Mapping[WorkflowNodeExecutionMetadataKey, Any]` [bad-index]
+  --> tests/unit_tests/core/workflow/nodes/trigger_plugin/test_trigger_event_node.py:59:28
 ERROR Argument `dict[str, dict[str, WriteMode | list[str] | str] | str]` is not assignable to parameter `config` with type `NodeConfigDict` in function `dify_graph.nodes.variable_assigner.v1.node.VariableAssignerNode.__init__` [bad-argument-type]
    --> tests/unit_tests/core/workflow/nodes/variable_assigner/v1/test_variable_assigner_v1.py:107:16
 ERROR Argument `dict[str, dict[str, WriteMode | list[str] | str] | str]` is not assignable to parameter `config` with type `NodeConfigDict` in function `dify_graph.nodes.variable_assigner.v1.node.VariableAssignerNode.__init__` [bad-argument-type]
@@ -5387,6 +5389,10 @@
    --> tests/unit_tests/dify_graph/model_runtime/utils/test_encoders.py:153:59
 ERROR No matching overload found for function `compile` called with arguments: (Literal['abc']) [no-matching-overload]
    --> tests/unit_tests/dify_graph/model_runtime/utils/test_encoders.py:181:40
+ERROR Argument `dict[str, Any]` is not assignable to parameter `metadata` with type `Mapping[WorkflowNodeExecutionMetadataKey, Any]` in function `dify_graph.node_events.base.NodeRunResult.__init__` [bad-argument-type]
+  --> tests/unit_tests/dify_graph/node_events/test_base.py:9:18
+ERROR Cannot index into `Mapping[WorkflowNodeExecutionMetadataKey, Any]` [bad-index]
+  --> tests/unit_tests/dify_graph/node_events/test_base.py:17:28
 ERROR Object of class `int` has no attribute `startswith` [missing-attribute]
   --> tests/unit_tests/extensions/otel/test_celery_sqlcommenter.py:25:16
 ERROR Cannot index into `object` [bad-index]

[github-actions]

Pyrefly Diff

No changes detected.