fix: fetch memory of LLM node may cause out of flask context

[hjlarry]

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Summary

fix #36252

Screenshots

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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 cd web && pnpm exec vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-05-16 13:23:44.022073787 +0000
+++ /tmp/pyrefly_pr.txt	2026-05-16 13:23:31.875995907 +0000
@@ -5506,23 +5506,25 @@
 ERROR Argument `_FakeSession` is not assignable to parameter `session` with type `Session | None` in function `core.workflow.human_input_forms.load_form_tokens_by_form_id` [bad-argument-type]
    --> tests/unit_tests/core/workflow/test_human_input_forms.py:101:17
 ERROR Argument `object` is not assignable to parameter `node_data_memory` with type `MemoryConfig | None` in function `core.workflow.node_factory.fetch_memory` [bad-argument-type]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:119:30
+   --> tests/unit_tests/core/workflow/test_node_factory.py:118:30
 ERROR Argument `object` is not assignable to parameter `node_data_memory` with type `MemoryConfig | None` in function `core.workflow.node_factory.fetch_memory` [bad-argument-type]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:155:30
+   --> tests/unit_tests/core/workflow/test_node_factory.py:153:30
+ERROR Argument `object` is not assignable to parameter `node_data_memory` with type `MemoryConfig | None` in function `core.workflow.node_factory.fetch_memory` [bad-argument-type]
+   --> tests/unit_tests/core/workflow/test_node_factory.py:192:30
 ERROR Argument `SimpleNamespace` is not assignable to parameter `graph_init_params` with type `GraphInitParams` in function `core.workflow.node_factory.DifyNodeFactory.__init__` [bad-argument-type]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:347:35
+   --> tests/unit_tests/core/workflow/test_node_factory.py:380:35
 ERROR `SimpleNamespace` is not assignable to attribute `graph_runtime_state` with type `GraphRuntimeState` [bad-assignment]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:410:39
+   --> tests/unit_tests/core/workflow/test_node_factory.py:443:39
 ERROR `SimpleNamespace` is not assignable to attribute `_dify_context` with type `DifyRunContext` [bad-assignment]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:411:33
+   --> tests/unit_tests/core/workflow/test_node_factory.py:444:33
 ERROR `form_repository` may be uninitialized [unbound-name]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:554:49
+   --> tests/unit_tests/core/workflow/test_node_factory.py:587:49
 ERROR `SimpleNamespace` is not assignable to attribute `graph_runtime_state` with type `GraphRuntimeState` [bad-assignment]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:817:39
+   --> tests/unit_tests/core/workflow/test_node_factory.py:850:39
 ERROR `SimpleNamespace` is not assignable to attribute `_dify_context` with type `DifyRunContext` [bad-assignment]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:947:33
+   --> tests/unit_tests/core/workflow/test_node_factory.py:980:33
 ERROR `SimpleNamespace` is not assignable to attribute `graph_runtime_state` with type `GraphRuntimeState` [bad-assignment]
-   --> tests/unit_tests/core/workflow/test_node_factory.py:948:39
+   --> tests/unit_tests/core/workflow/test_node_factory.py:981:39
 ERROR Object of class `ExternalRecipient` has no attribute `reference_id` [missing-attribute]
   --> tests/unit_tests/core/workflow/test_node_runtime.py:92:12
 ERROR Argument `object` is not assignable to parameter `method` with type `EmailDeliveryMethod | InteractiveSurfaceDeliveryMethod` in function `core.workflow.node_runtime.apply_dify_debug_email_recipient` [bad-argument-type]

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	0.00%	43.70%	+43.70%
Strict coverage	0.00%	43.22%	+43.22%
Typed symbols	0	22,132	+22,132
Untyped symbols	0	28,830	+28,830
Modules	0	2557	+2,557