refactor(db)!: finalize pooled WNDB v2 migration

app/api/v1/endpoints/meta.py

@@ -2,14 +2,11 @@ import logging
 from fastapi import APIRouter, Depends, HTTPException, status, Query, Path
 import psycopg
 from psycopg import AsyncConnection
-from sqlalchemy import text
-from sqlalchemy.exc import SQLAlchemyError
-from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.auth.project_dependencies import (
     ProjectContext,
     get_project_context,
-    get_project_pg_session,
+    get_project_pg_connection,
     get_project_timescale_connection,
     get_metadata_repository,
 )
@@ -90,7 +87,7 @@ async def list_user_projects(
 
 @router.get("/projects/current/database-health", summary="检查数据库健康状态", description="检查项目数据库连接的健康状况")
 async def project_db_health(
-    pg_session: AsyncSession = Depends(get_project_pg_session),
+    pg_conn: AsyncConnection = Depends(get_project_pg_connection),
     ts_conn: AsyncConnection = Depends(get_project_timescale_connection),
 ):
     """
@@ -99,8 +96,10 @@ async def project_db_health(
     检查PostgreSQL和TimescaleDB数据库的连接状态
     """
     try:
-        await pg_session.execute(text("SELECT 1"))
-    except SQLAlchemyError as exc:
+        async with pg_conn.cursor() as cur:
+            await cur.execute("SELECT 1")
+            await cur.fetchone()
+    except psycopg.Error as exc:
         logger.error("Project PostgreSQL health check failed", exc_info=True)
         raise HTTPException(
             status_code=status.HTTP_503_SERVICE_UNAVAILABLE,