fix(stability): 健康监控 DB 操作异步化，防止 worker 超时崩溃

- executor: record_success 通过 asyncio.to_thread offload 到线程池
- error_handler: 3 处 record_failure 同样 offload 到线程池
- sync_execute: 设置 expire_on_commit=False 防止 commit 后 ORM 懒加载
- handler_adapter_base: 归一化 check_endpoint 的 base_url 输入

tests/services/test_sync_execute_expire_on_commit.py

@@ -0,0 +1,118 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from src.services.task.core.schema import ExecutionResult
+from src.services.task.execute.sync_execute import SyncTaskExecutionService
+
+
+@pytest.mark.asyncio
+async def test_execute_sync_unified_temporarily_disables_expire_on_commit(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    db = MagicMock()
+    db.expire_on_commit = True
+    db.query.return_value.filter.return_value.first.return_value = SimpleNamespace(username="alice")
+
+    pool_ops = MagicMock()
+    pool_ops.apply_pool_reorder = AsyncMock(return_value=([], []))
+
+    service = SyncTaskExecutionService(
+        db,
+        None,
+        recorder=MagicMock(),
+        pool_ops=pool_ops,
+        error_ops=MagicMock(),
+        failure_ops=MagicMock(),
+    )
+
+    cache_scheduler = SimpleNamespace(_ensure_initialized=AsyncMock())
+
+    class _StubCandidateResolver:
+        def __init__(self, db: object, cache_scheduler: object) -> None:
+            self.db = db
+            self.cache_scheduler = cache_scheduler
+
+        async def fetch_candidates(self, **kwargs: object) -> tuple[list[object], str]:
+            return [], "gpt-4.1"
+
+        async def create_candidate_records_async(
+            self, **kwargs: object
+        ) -> dict[tuple[int, int], str]:
+            return {}
+
+        def count_total_attempts(self, _all_candidates: list[object]) -> int:
+            return 0
+
+    class _StubFailoverEngine:
+        def __init__(self, db: object, **kwargs: object) -> None:
+            self.db = db
+
+        async def execute(self, **kwargs: object) -> ExecutionResult:
+            assert getattr(self.db, "expire_on_commit") is False
+            return ExecutionResult(success=True)
+
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.SystemConfigService.get_config",
+        lambda _db, _key, default=None: default,
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.get_cache_aware_scheduler",
+        AsyncMock(return_value=cache_scheduler),
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.CandidateResolver",
+        _StubCandidateResolver,
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.ErrorClassifier",
+        lambda **kwargs: MagicMock(),
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.RequestDispatcher",
+        lambda **kwargs: MagicMock(),
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.FailoverEngine",
+        _StubFailoverEngine,
+    )
+    monkeypatch.setattr(
+        "src.services.task.execute.sync_execute.UsageService.create_pending_usage",
+        lambda **kwargs: None,
+    )
+    monkeypatch.setattr(
+        "src.services.scheduling.utils.release_db_connection_before_await",
+        lambda _db: None,
+    )
+    monkeypatch.setattr(
+        "src.services.rate_limit.concurrency_manager.get_concurrency_manager",
+        AsyncMock(return_value=MagicMock()),
+    )
+    monkeypatch.setattr(
+        "src.services.rate_limit.adaptive_rpm.get_adaptive_rpm_manager",
+        lambda: MagicMock(),
+    )
+    monkeypatch.setattr(
+        "src.services.request.executor.RequestExecutor",
+        lambda **kwargs: MagicMock(),
+    )
+
+    result = await service.execute_sync_unified(
+        api_format="openai_chat",
+        model_name="gpt-4.1",
+        user_api_key=SimpleNamespace(id="key-1", user_id="user-1", name="default-key"),
+        request_func=AsyncMock(),
+        request_id="req-1",
+        is_stream=True,
+        capability_requirements=None,
+        preferred_key_ids=None,
+        request_body_ref=None,
+        request_headers=None,
+        request_body=None,
+    )
+
+    assert result.success is True
+    assert db.expire_on_commit is True