add conversation expire config & user query text to dingtalk card (#2147)

* add conversation expire config

* add user query text to card

* fix(pipeline): move session limit to AI config

* test(pipeline): cover AI session limit config

* refactor(pipeline): merge session expire-time into AI runner stage

Move the session validity duration field out of the standalone
session-limit stage into the runner stage so it actually renders in the
AI tab (the tab only shows the runner stage and the stage matching the
selected runner — any other stage is filtered out). Read path, default
config, metadata description, and tests updated accordingly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(pipeline): expire conversations from last update time

* fix(n8n): sync generated conversation id into payload

---------

Co-authored-by: RockChinQ <rockchinq@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit_tests/pipeline/test_chat_session_limit.py

@@ -0,0 +1,106 @@
+from __future__ import annotations
+
+from datetime import datetime, timedelta
+from importlib import import_module
+from pathlib import Path
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, Mock
+
+import pytest
+import yaml
+
+
+def _preproc_module():
+    # Import pipelinemgr first so pipeline stages are registered without tripping
+    # the stage <-> core.app circular import during isolated test collection.
+    import_module('langbot.pkg.pipeline.pipelinemgr')
+    return import_module('langbot.pkg.pipeline.preproc.preproc')
+
+
+def _entities_module():
+    return import_module('langbot.pkg.pipeline.entities')
+
+
+def _conversation(created_at: datetime, updated_at: datetime | None = None):
+    prompt = Mock()
+    prompt.messages = []
+    prompt.copy = Mock(return_value=Mock(messages=[]))
+
+    return SimpleNamespace(
+        uuid='existing-conversation-uuid',
+        create_time=created_at,
+        update_time=updated_at,
+        prompt=prompt,
+        messages=[],
+    )
+
+
+def _prompt_preprocessing_context(default_prompt=None, prompt=None):
+    ctx = Mock()
+    ctx.event.default_prompt = default_prompt or []
+    ctx.event.prompt = prompt or []
+    return ctx
+
+
+async def _run_preprocessor(mock_app, sample_query, conversation):
+    session = SimpleNamespace(launcher_type=sample_query.launcher_type, launcher_id=sample_query.launcher_id)
+    mock_app.sess_mgr.get_session = AsyncMock(return_value=session)
+    mock_app.sess_mgr.get_conversation = AsyncMock(return_value=conversation)
+    mock_app.plugin_connector.emit_event = AsyncMock(return_value=_prompt_preprocessing_context())
+
+    sample_query.pipeline_config = {
+        'ai': {
+            'runner': {'runner': 'local-agent', 'expire-time': 60},
+            'local-agent': {'model': {'primary': '', 'fallbacks': []}, 'prompt': []},
+        },
+        'trigger': {'misc': {'combine-quote-message': False}},
+        'output': {'misc': {'exception-handling': 'show-hint'}},
+    }
+
+    return await _preproc_module().PreProcessor(mock_app).process(sample_query, 'PreProcessor')
+
+
+@pytest.mark.asyncio
+async def test_preprocessor_expires_conversation_from_last_update_time(mock_app, sample_query):
+    conversation = _conversation(
+        created_at=datetime.now() - timedelta(seconds=10),
+        updated_at=datetime.now() - timedelta(seconds=120),
+    )
+
+    result = await _run_preprocessor(mock_app, sample_query, conversation)
+
+    assert result.result_type == _entities_module().ResultType.CONTINUE
+    assert conversation.uuid is None
+    assert conversation.update_time > datetime.now() - timedelta(seconds=5)
+    assert result.new_query.variables['conversation_id'] is None
+
+
+@pytest.mark.asyncio
+async def test_preprocessor_keeps_conversation_when_last_update_is_not_expired(mock_app, sample_query):
+    conversation = _conversation(
+        created_at=datetime.now() - timedelta(seconds=120),
+        updated_at=datetime.now() - timedelta(seconds=30),
+    )
+
+    result = await _run_preprocessor(mock_app, sample_query, conversation)
+
+    assert result.result_type == _entities_module().ResultType.CONTINUE
+    assert conversation.uuid == 'existing-conversation-uuid'
+    assert conversation.update_time > datetime.now() - timedelta(seconds=5)
+    assert result.new_query.variables['conversation_id'] == 'existing-conversation-uuid'
+
+
+def test_expire_time_metadata_lives_under_ai_runner_not_safety():
+    metadata_dir = Path('src/langbot/templates/metadata/pipeline')
+
+    ai_meta = yaml.safe_load((metadata_dir / 'ai.yaml').read_text())
+    safety_meta = yaml.safe_load((metadata_dir / 'safety.yaml').read_text())
+
+    ai_stage_names = [stage['name'] for stage in ai_meta['stages']]
+    assert 'session-limit' not in ai_stage_names
+    assert 'session-limit' not in [stage['name'] for stage in safety_meta['stages']]
+
+    runner_stage = next(stage for stage in ai_meta['stages'] if stage['name'] == 'runner')
+    expire_time = next(item for item in runner_stage['config'] if item['name'] == 'expire-time')
+    assert 'Conversation expire time' in expire_time['label']['en_US']
+    assert 'Session validity' not in expire_time['label']['en_US']