diff --git a/apps/worker/worker_app/db.py b/apps/worker/worker_app/db.py
index 32c503773..ec59f96a5 100644
--- a/apps/worker/worker_app/db.py
+++ b/apps/worker/worker_app/db.py
@@ -8,9 +8,10 @@ from packages.adapters.sqlalchemy_impl import (
 from packages.adapters.sqlalchemy_impl.schema_guard import assert_auto_create_schema_allowed
 
 settings = get_settings()
-ensure_database_exists(settings.database_url)
+_db_url = settings.effective_database_url
+ensure_database_exists(_db_url)
 engine, SessionLocal = build_session_factory(
-    settings.database_url,
+    _db_url,
     pool_size=settings.database_pool_size,
     max_overflow=settings.database_max_overflow,
     pool_timeout=settings.database_pool_timeout,
diff --git a/packages/adapters/sqlalchemy_impl/session.py b/packages/adapters/sqlalchemy_impl/session.py
index c48d33d72..89f541368 100644
--- a/packages/adapters/sqlalchemy_impl/session.py
+++ b/packages/adapters/sqlalchemy_impl/session.py
@@ -48,12 +48,20 @@ def build_session_factory(
     return engine, session_factory
 
 
+def _is_sqlite(database_url: str) -> bool:
+    """检测是否为 SQLite 数据库 URL."""
+    return database_url.startswith("sqlite")
+
+
 def _build_admin_url(database_url: str) -> URL:
     url = make_url(database_url)
     return url.set(database="postgres")
 
 
 def ensure_database_exists(database_url: str) -> None:
+    """确保数据库存在（仅 PostgreSQL 需要，SQLite 自动创建）."""
+    if _is_sqlite(database_url):
+        return
     target_url = make_url(database_url)
     admin_engine = create_engine(_build_admin_url(database_url), isolation_level="AUTOCOMMIT")
     try:
@@ -70,6 +78,14 @@ def ensure_database_exists(database_url: str) -> None:
 
 
 def initialize_database(engine) -> None:
+    """初始化数据库 schema。
+
+    PostgreSQL 使用 advisory lock 防止并发初始化冲突；
+    SQLite 直接 create_all（单文件，无并发风险）。
+    """
+    if _is_sqlite(str(engine.url)):
+        Base.metadata.create_all(bind=engine)
+        return
     with engine.connect() as connection:
         connection.execute(text("SELECT pg_advisory_lock(:lock_id)"), {"lock_id": SCHEMA_INIT_LOCK_ID})
         try:
diff --git a/packages/config/base.py b/packages/config/base.py
index 905c09667..d0ef1d5ac 100755
--- a/packages/config/base.py
+++ b/packages/config/base.py
@@ -34,6 +34,9 @@ class SharedSettings(BaseSettings):
     database_pool_timeout: int = 30
     database_pool_recycle: int = 3600
 
+    # 测试用：使用 SQLite 内存数据库（CI 环境无需 PostgreSQL）
+    use_in_memory_db: bool = False
+
     # ── Redis ────────────────────────────────────────────────────────────
     redis_url: str = "redis://localhost:6379/0"
 
@@ -66,6 +69,16 @@ class SharedSettings(BaseSettings):
     doubao_timeout: int = 30
     doubao_max_retries: int = 2
 
+    @property
+    def effective_database_url(self) -> str:
+        """返回实际使用的数据库 URL。
+
+        当 USE_IN_MEMORY_DB=True 时返回 SQLite 内存 URL，否则返回 database_url。
+        """
+        if self.use_in_memory_db:
+            return "sqlite:///./test.db"
+        return self.database_url
+
     model_config = SettingsConfigDict(
         env_file=".env",
         env_file_encoding="utf-8",
diff --git a/pytest.ini b/pytest.ini
index 92a1f25d3..a2b3f4486 100755
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,6 +1,8 @@
 [pytest]
 pythonpath = . apps/api apps/worker packages
 testpaths = tests
+# importlib 模式避免同名测试文件的模块名冲突
+addopts = --import-mode=importlib
 
 # ===== 覆盖率配置 =====
 # 覆盖率统计范围（供 --cov 使用时的默认源）