diff --git a/app/database.py b/app/database.py
index 441149f..79b26c9 100644
--- a/app/database.py
+++ b/app/database.py
@@ -16,16 +16,38 @@ DB_NAME = os.getenv("DB_NAME")
 
 DATABASE_URL = f"postgresql+asyncpg://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}"
 
-engine = create_async_engine(
-    DATABASE_URL,
-    echo=True,
-    future=True,
-    pool_pre_ping=True,
-    pool_recycle=300,
-)
+_engine = None
+
+
+def get_engine():
+    """Lazy engine creation to ensure pool is bound to the current event loop."""
+    global _engine
+    if _engine is None:
+        _engine = create_async_engine(
+            DATABASE_URL,
+            echo=True,
+            future=True,
+            pool_pre_ping=True,
+            pool_recycle=300,
+        )
+    return _engine
+
+
+async def dispose_engine():
+    """Dispose engine and reset so next call creates a fresh one."""
+    global _engine
+    if _engine is not None:
+        await _engine.dispose()
+        _engine = None
+
+
+# Module-level alias for backward compatibility
+engine = None  # Use get_engine() instead
+
 
 async def init_db():
-    async with engine.begin() as conn:
+    eng = get_engine()
+    async with eng.begin() as conn:
         # await conn.run_sync(SQLModel.metadata.drop_all)
         await conn.run_sync(SQLModel.metadata.create_all)
 
@@ -59,7 +81,7 @@ async def init_db():
 
 async def get_session() -> AsyncSession:
     async_session = sessionmaker(
-        engine, class_=AsyncSession, expire_on_commit=False
+        get_engine(), class_=AsyncSession, expire_on_commit=False
     )
     async with async_session() as session:
         yield session
diff --git a/app/main.py b/app/main.py
index 9bfbfb3..3e0ce13 100644
--- a/app/main.py
+++ b/app/main.py
@@ -3,7 +3,7 @@ from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse
 from sqlmodel.ext.asyncio.session import AsyncSession
 from sqlmodel import select, func, text
-from .database import init_db, get_session, engine
+from .database import init_db, get_session, get_engine
 from .models import ErrorLog, ErrorLogCreate, LogStatus, TaskStatusUpdate, RepairTask, RepairTaskCreate, Project, ProjectUpdate
 from .gitea_client import GiteaClient
 from .self_report import self_report_error
@@ -49,7 +49,7 @@ async def _register_self_projects():
             "description": "日志中台 React 管理端",
         },
     ]
-    async_session = sa_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+    async_session = sa_sessionmaker(get_engine(), class_=AsyncSession, expire_on_commit=False)
     async with async_session() as session:
         for proj_data in projects:
             stmt = select(Project).where(Project.project_id == proj_data["project_id"])
diff --git a/app/self_report.py b/app/self_report.py
index 29cbabf..4c7706f 100644
--- a/app/self_report.py
+++ b/app/self_report.py
@@ -9,7 +9,7 @@ from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
 from sqlalchemy.orm import sessionmaker
 
-from .database import engine
+from .database import get_engine
 from .models import ErrorLog, LogStatus, Project
 
 PROJECT_ID = "log_center_api"
@@ -35,7 +35,7 @@ async def self_report_error(exc: Exception, context: dict = None):
         raw = f"{PROJECT_ID}|{error_type}|{file_path}|{line_number}"
         fingerprint = hashlib.md5(raw.encode()).hexdigest()
 
-        async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+        async_session = sessionmaker(get_engine(), class_=AsyncSession, expire_on_commit=False)
         async with async_session() as session:
             # 去重检查
             stmt = select(ErrorLog).where(ErrorLog.fingerprint == fingerprint)