checkpoint: SQLite 清理——业务/测试层统一 PostgreSQL（删 aiosqlite/fakeredis）

- setting: DATABASE_TYPE 收窄为 postgres，DB_URI/ASYNC_DB_URI 去 sqlite 分支
- database: create_async_engine_and_session 去 sqlite 分支（同步 psycopg 引擎保留给 jobstore）
- number_gen: 去 DATABASE_TYPE 非 postgres 早退（advisory lock 恒定走 PG）
- chat/crud: 删 SqliteDb 分支（agno 无硬依赖）
- pyproject/requirements/uv.lock: 删 aiosqlite、fakeredis；conftest 口径注释同步
- test_stat_analysis_tc: docstring 口径 SQLite→PG

backend/app/api/v1/module_ai/chat/crud.py

@@ -3,7 +3,6 @@ from typing import Any
 from agno.db.base import SessionType
 from agno.db.mysql import MySQLDb
 from agno.db.postgres import PostgresDb
-from agno.db.sqlite import SqliteDb
 from agno.session.team import TeamSession
 
 from app.config.setting import settings
@@ -34,7 +33,6 @@ class ChatSessionCRUD:
         db_mapping = {
             "mysql": lambda: MySQLDb(db_url=db_uri, db_schema=settings.DATABASE_NAME, create_schema=False),
             "postgres": lambda: PostgresDb(db_url=db_uri, db_schema="public", create_schema=False),
-            "sqlite": lambda: SqliteDb(db_file=db_uri.replace("sqlite:///", "")),
         }
 
         if db_type not in db_mapping:

backend/app/config/setting.py

@@ -10,7 +10,6 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 from app.common.enums import EnvironmentEnum
 from app.config.path_conf import ENV_DIR, STATIC_DIR
 
-
 # JWT 开发默认密钥：仅允许 DEV 环境使用，生产命中即拒绝启动
 _DEV_DEFAULT_SECRET_KEY = "dpb-dev-secret-key-do-not-use-in-production"
 
@@ -110,8 +109,8 @@ class Settings(BaseSettings):
     AUTOFETCH: bool | None = None  # AUTOFLUSH 别名（优先级高于 AUTOFLUSH，兼容旧环境变量名）
     EXPIRE_ON_COMMIT: bool = False  # 是否在提交时过期
 
-    # 数据库连接（生产 PostgreSQL；测试套件用 SQLite）
-    DATABASE_TYPE: Literal["postgres", "sqlite"] = "postgres"
+    # 数据库连接（开发与生产统一 PostgreSQL）
+    DATABASE_TYPE: Literal["postgres"] = "postgres"
     DATABASE_HOST: str = "localhost"
     DATABASE_PORT: int = 5432
     DATABASE_USER: str = "dpb"
@@ -305,19 +304,11 @@ class Settings(BaseSettings):
 
     @property
     def ASYNC_DB_URI(self) -> str:
-        if self.DATABASE_TYPE == "postgres":
-            db_connect = f"postgresql+asyncpg://{self.DATABASE_USER}:{quote_plus(self.DATABASE_PASSWORD)}@{self.DATABASE_HOST}:{self.DATABASE_PORT}/{self.DATABASE_NAME}"
-        else:
-            db_connect = f"sqlite+aiosqlite:///{self.DATABASE_NAME}.db"
-        return db_connect
+        return f"postgresql+asyncpg://{self.DATABASE_USER}:{quote_plus(self.DATABASE_PASSWORD)}@{self.DATABASE_HOST}:{self.DATABASE_PORT}/{self.DATABASE_NAME}"
 
     @property
     def DB_URI(self) -> str:
-        if self.DATABASE_TYPE == "postgres":
-            db_connect = f"postgresql+psycopg://{self.DATABASE_USER}:{quote_plus(self.DATABASE_PASSWORD)}@{self.DATABASE_HOST}:{self.DATABASE_PORT}/{self.DATABASE_NAME}"
-        else:
-            db_connect = f"sqlite:///{self.DATABASE_NAME}.db"
-        return db_connect
+        return f"postgresql+psycopg://{self.DATABASE_USER}:{quote_plus(self.DATABASE_PASSWORD)}@{self.DATABASE_HOST}:{self.DATABASE_PORT}/{self.DATABASE_NAME}"
 
     @property
     def FASTAPI_CONFIG(self) -> dict[str, Any]:

backend/app/core/database.py

@@ -49,29 +49,19 @@ def create_async_engine_and_session(db_url: str = settings.ASYNC_DB_URI) -> tupl
     - tuple[AsyncEngine, async_sessionmaker[AsyncSession]]: 异步数据库引擎和会话工厂。
     """
     try:
-        # 异步数据库引擎
-        if settings.DATABASE_TYPE == "sqlite":
-            async_engine = create_async_engine(
-                url=db_url,
-                echo=settings.DATABASE_ECHO,
-                echo_pool=settings.ECHO_POOL,
-                pool_pre_ping=settings.POOL_PRE_PING,
-                future=settings.FUTURE,
-                pool_recycle=settings.POOL_RECYCLE,
-            )
-        else:
-            async_engine = create_async_engine(
-                url=db_url,
-                echo=settings.DATABASE_ECHO,
-                echo_pool=settings.ECHO_POOL,
-                pool_pre_ping=settings.POOL_PRE_PING,
-                future=settings.FUTURE,
-                pool_recycle=settings.POOL_RECYCLE,
-                pool_size=settings.POOL_SIZE,
-                max_overflow=settings.MAX_OVERFLOW,
-                pool_timeout=settings.POOL_TIMEOUT,
-                pool_use_lifo=settings.POOL_USE_LIFO,
-            )
+        # 异步数据库引擎（统一 PostgreSQL 连接池参数）
+        async_engine = create_async_engine(
+            url=db_url,
+            echo=settings.DATABASE_ECHO,
+            echo_pool=settings.ECHO_POOL,
+            pool_pre_ping=settings.POOL_PRE_PING,
+            future=settings.FUTURE,
+            pool_recycle=settings.POOL_RECYCLE,
+            pool_size=settings.POOL_SIZE,
+            max_overflow=settings.MAX_OVERFLOW,
+            pool_timeout=settings.POOL_TIMEOUT,
+            pool_use_lifo=settings.POOL_USE_LIFO,
+        )
     except Exception as e:
         logger.error(f"❌ 数据库连接失败 {e}")
         raise

backend/app/utils/number_gen.py

@@ -7,7 +7,7 @@
 存量数据迁移：首次使用某序列名时由 seed_fn（服务端传入）从既有记录推算
 起始号（原扫描逻辑），此后全部走原子递增，不再扫描。
 """
-from typing import Any, Awaitable, Callable
+from collections.abc import Awaitable, Callable
 
 from sqlalchemy import select, text
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -23,10 +23,6 @@ class NumberGenService:
 
     @staticmethod
     async def _acquire_lock(db: AsyncSession, name: str) -> None:
-        from app.config.setting import settings
-
-        if settings.DATABASE_TYPE != "postgres":
-            return  # sqlite 测试库无 advisory lock，退化为普通自增（单进程无并发竞争）
         # hashtextextended 对文本做稳定 64 位哈希，同名序列恒映射同一把锁
         await db.execute(text("SELECT pg_advisory_xact_lock(hashtextextended(:n, 0))"), {"n": name})