refactor: isolate agent history queries

tests/test_agent_task_runs.py

@@ -14,6 +14,7 @@ from app.db.oper.agenttask import AgentTaskOper
 from app.db.models.agenttask import AgentTask
 from app.db.models.agenttaskrun import AgentTaskRun
 from app.db.session import SessionFactory
+from app.db import decorators
 
 
 Engine = get_engine()
@@ -134,6 +135,35 @@ def test_begin_run_rejects_unknown_trigger_source() -> None:
     assert AgentTaskOper().list_runs(task.id) == []
 
 
+def test_agenttaskrun_oper_reuses_explicit_query_session(db, monkeypatch):
+    """AgentTaskOper 的运行记录查询必须复用调用方同步会话。"""
+    task = _add_task("run-explicit-query")
+    run = AgentTaskOper().begin_run(task.id)
+    assert run
+    monkeypatch.setattr(
+        decorators,
+        "ScopedSession",
+        lambda: (_ for _ in ()).throw(AssertionError("不应创建额外同步会话")),
+    )
+
+    oper = AgentTaskOper(db.session)
+    assert oper.get_run(run.run_id) is not None
+    assert oper.list_runs(task.id)
+
+
+def test_agenttaskrun_model_legacy_query_keeps_keyword_abi(monkeypatch):
+    """旧插件以关键字直调 AgentTaskRun 时仍自动补入短会话。"""
+    opened = []
+    monkeypatch.setattr(
+        decorators,
+        "ScopedSession",
+        lambda: (opened.append(True) or SessionFactory()),
+    )
+
+    assert AgentTaskRun.get_by_run_id(run_id="missing-legacy") is None
+    assert opened == [True]
+
+
 def test_begin_run_rolls_back_task_claim_when_run_insert_fails() -> None:
     """运行记录插入失败时，任务的 running 投影必须随事务回滚。"""
     first_task = _add_task("run-rollback-first")