feat(workflow): expose bulk execution status as a system variable

[lxy123hh]

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Summary

• expose a read-only Boolean sys.is_bulk_execution variable for top-level Workflow runs
• propagate the bulk execution flag from Batch requests through the workflow generate entity into the system variable pool
• default the flag to false for existing clients while allowing Service API callers to set it explicitly
• keep Chatflow and the existing RAG Pipeline sys.batch variable unchanged
• add frontend and backend regression coverage for request propagation, serialization, and variable visibility

Fixes #40021

Screenshots

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 && make type-check (backend) and vp staged (frontend) to appease the lint gods

[crazywoola]

Please attach some screenshots as well.

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-08-19 03:25:35.817129645 +0000
+++ /tmp/pyrefly_pr.txt	2026-08-19 03:25:22.501914818 +0000
@@ -3491,7 +3491,7 @@
 ERROR Argument `Literal['account']` is not assignable to parameter `created_by_role` with type `CreatorUserRole` in function `models.model.UploadFile.__init__` [bad-argument-type]
     --> tests/unit_tests/controllers/console/datasets/test_datasets_segments.py:1208:29
 ERROR Object of class `FunctionType` has no attribute `assert_called_once_with` [missing-attribute]
-   --> tests/unit_tests/controllers/console/explore/test_trial.py:199:5
+   --> tests/unit_tests/controllers/console/explore/test_trial.py:207:5
 ERROR Argument `() -> Session` is not assignable to parameter `session_factory` with type `sessionmaker[@_]` in function `sqlalchemy.orm.scoping.scoped_session.__init__` [bad-argument-type]
   --> tests/unit_tests/controllers/console/explore/test_wraps.py:28:39
 ERROR Argument `str` is not assignable to parameter `view` with type `(InstalledApp) -> str` in function `controllers.console.explore.wraps.decorator` [bad-argument-type]
@@ -3897,7 +3897,7 @@
 ERROR Missing argument `message_id` in function `controllers.common.controller_schemas.SavedMessageCreatePayload.__init__` [missing-argument]
    --> tests/unit_tests/controllers/web/test_pydantic_models.py:308:38
 ERROR Missing argument `inputs` in function `controllers.common.controller_schemas.WorkflowRunPayload.__init__` [missing-argument]
-   --> tests/unit_tests/controllers/web/test_pydantic_models.py:329:31
+   --> tests/unit_tests/controllers/web/test_pydantic_models.py:334:31
 ERROR Object of class `FromClause` has no attribute `create` [missing-attribute]
   --> tests/unit_tests/controllers/web/test_web_forgot_password.py:30:9
 ERROR `None` is not subscriptable [unsupported-operation]
@@ -5069,13 +5069,13 @@
 ERROR Cannot index into `str` [bad-index]
    --> tests/unit_tests/core/app/apps/test_streaming_utils.py:128:12
 ERROR Argument `tuple[Literal['layer']]` is not assignable to parameter `graph_engine_layers` with type `Sequence[GraphEngineLayer]` in function `core.app.apps.workflow.app_generator.WorkflowAppGenerator.resume` [bad-argument-type]
-   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:323:29
+   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:325:29
 ERROR Argument `tuple[Literal['base-layer']]` is not assignable to parameter `graph_engine_layers` with type `Sequence[GraphEngineLayer]` in function `core.app.apps.workflow.app_generator.WorkflowAppGenerator._generate` [bad-argument-type]
-   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:407:33
+   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:409:33
 ERROR Cannot index into `object` [bad-index]
-   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:416:27
+   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:418:27
 ERROR Cannot index into `object` [bad-index]
-   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:419:12
+   --> tests/unit_tests/core/app/apps/test_workflow_app_generator.py:421:12
 ERROR Argument `SimpleNamespace` is not assignable to parameter `queue_manager` with type `AppQueueManager` in function `core.app.apps.workflow_app_runner.WorkflowBasedAppRunner.__init__` [bad-argument-type]
   --> tests/unit_tests/core/app/apps/test_workflow_app_runner_core.py:72:55
 ERROR Argument `SimpleNamespace` is not assignable to parameter `queue_manager` with type `AppQueueManager` in function `core.app.apps.workflow_app_runner.WorkflowBasedAppRunner.__init__` [bad-argument-type]

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	59.69%	59.70%	+0.00%
Strict coverage	59.28%	59.28%	+0.00%
Typed symbols	39,917	39,922	+5
Untyped symbols	27,142	27,143	+1
Modules	3181	3181	0

[lxy123hh]

Please attach some screenshots as well.

Thanks for the feedback. I've added a screenshot showing sys.is_bulk_execution in the workflow system variable selector.