diff --git a/app/db/init.py b/app/db/init.py
index e3d9310f4..56c0e11c0 100644
--- a/app/db/init.py
+++ b/app/db/init.py
@@ -1,4 +1,5 @@
 from configparser import ConfigParser as _ConfigParser
+import traceback
 
 from alembic.command import upgrade
 from alembic.config import Config
@@ -38,5 +39,8 @@ def update_db():
             
         alembic_cfg.set_main_option('sqlalchemy.url', db_url)
         upgrade(alembic_cfg, 'head')
-    except Exception as e:
-        logger.error(f'数据库更新失败：{str(e)}')
+    except Exception as error:
+        logger.error(
+            f'数据库更新失败：{str(error)} - {traceback.format_exc()}'
+        )
+        raise
diff --git a/tests/test_database_migration_startup.py b/tests/test_database_migration_startup.py
new file mode 100644
index 000000000..d1dd58b61
--- /dev/null
+++ b/tests/test_database_migration_startup.py
@@ -0,0 +1,63 @@
+import importlib.util
+from pathlib import Path
+import sys
+import uuid
+
+import pytest
+
+from app.db import init as db_init
+
+
+LOCAL_SETUP_PATH = (
+    Path(__file__).resolve().parents[1] / "scripts" / "local_setup.py"
+)
+
+
+def _load_local_setup_module():
+    """加载隔离的本地安装脚本实例，避免测试间共享模块状态。"""
+    module_name = f"moviepilot_local_setup_migration_{uuid.uuid4().hex}"
+    spec = importlib.util.spec_from_file_location(module_name, LOCAL_SETUP_PATH)
+    assert spec and spec.loader
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+def test_update_db_preserves_migration_error_and_traceback(monkeypatch) -> None:
+    """迁移失败日志应保留堆栈，同时向调用方传播原始异常。"""
+    migration_error = RuntimeError("migration failed")
+    logged_errors: list[str] = []
+
+    def fail_upgrade(*_args, **_kwargs) -> None:
+        raise migration_error
+
+    monkeypatch.setattr(db_init, "upgrade", fail_upgrade)
+    monkeypatch.setattr(db_init.logger, "error", logged_errors.append)
+
+    with pytest.raises(RuntimeError) as raised:
+        db_init.update_db()
+
+    assert raised.value is migration_error
+    assert len(logged_errors) == 1
+    assert "数据库更新失败：migration failed" in logged_errors[0]
+    assert "RuntimeError: migration failed" in logged_errors[0]
+
+
+def test_local_setup_returns_failure_when_database_migration_fails(
+        monkeypatch,
+        capsys,
+) -> None:
+    """本地维护命令不得在迁移失败后继续访问业务表。"""
+    module = _load_local_setup_module()
+    migration_error = RuntimeError("migration failed")
+
+    def fail_sync() -> None:
+        raise migration_error
+
+    monkeypatch.setattr(sys, "argv", [str(LOCAL_SETUP_PATH), "sync-superuser"])
+    monkeypatch.setattr(module, "_resolve_interactive_config_dir", lambda *_: None)
+    monkeypatch.setattr(module, "configure_config_dir", lambda **_: Path("config"))
+    monkeypatch.setattr(module, "_sync_superuser_account_inner", fail_sync)
+
+    assert module.main() == 1
+    assert "migration failed" in capsys.readouterr().err
diff --git a/tests/test_docker_entrypoint_permissions.py b/tests/test_docker_entrypoint_permissions.py
index cd90b128c..9d052706a 100644
--- a/tests/test_docker_entrypoint_permissions.py
+++ b/tests/test_docker_entrypoint_permissions.py
@@ -261,3 +261,16 @@ def test_backend_ready_timeout_accepts_leading_zero_decimal(tmp_path: Path) -> N
 
     assert "MOVIEPILOT_BACKEND_READY_TIMEOUT=08 无效" not in output
     assert "MoviePilot Web 已可访问" in output
+
+
+def test_backend_failure_keepalive_contract_is_explicit() -> None:
+    """后端异常默认保活诊断，显式关闭后才退出容器。"""
+    content = (ROOT / "docker" / "entrypoint.sh").read_text(encoding="utf-8")
+    function = content.split(
+        "function diagnostic_keepalive() {", 1
+    )[1].split("\n}", 1)[0]
+
+    assert 'MOVIEPILOT_DOCKER_KEEPALIVE_ON_FAILURE:-true' in function
+    assert 'if [ "${keepalive}" = "false" ]' in function
+    assert 'graceful_exit "$exit_code" "python_exit"' in function
+    assert "容器将保持运行以便执行 moviepilot doctor" in function
diff --git a/tests/test_lifecycle_shutdown.py b/tests/test_lifecycle_shutdown.py
index 34b9c7d41..25f88bc13 100644
--- a/tests/test_lifecycle_shutdown.py
+++ b/tests/test_lifecycle_shutdown.py
@@ -154,6 +154,25 @@ def test_application_preserves_stop_requested_before_startup(monkeypatch):
     ]
 
 
+def test_application_does_not_start_server_after_migration_failure(monkeypatch):
+    """数据库迁移失败时不得启动 API 服务。"""
+    from app import main
+
+    migration_error = RuntimeError("migration failed")
+    server_run = MagicMock()
+    monkeypatch.setattr(main.signal, "signal", MagicMock())
+    monkeypatch.setattr(main, "start_tray", MagicMock())
+    monkeypatch.setattr(main, "init_db", MagicMock())
+    monkeypatch.setattr(main, "update_db", MagicMock(side_effect=migration_error))
+    monkeypatch.setattr(main.Server, "run", server_run)
+
+    with pytest.raises(RuntimeError) as raised:
+        main.run_application()
+
+    assert raised.value is migration_error
+    server_run.assert_not_called()
+
+
 def test_uvicorn_preserves_stop_requested_before_serve(monkeypatch):
     """Uvicorn 启动不能清除数据库初始化阶段已经发布的停止请求"""
     from app import main