Fix SQL expression warning in health check endpoint

app/api/routes/health.py

@@ -1,5 +1,6 @@
 from fastapi import APIRouter, Depends, status
 from sqlalchemy.orm import Session
+from sqlalchemy import text
 from app.db.session import get_db
 
 router = APIRouter()
@@ -19,8 +20,8 @@ def health_check(db: Session = Depends(get_db)):
     
     # Test database connection
     try:
-        # Execute a simple query
-        db.execute("SELECT 1")
+        # Execute a simple query using proper SQLAlchemy text() function
+        db.execute(text("SELECT 1"))
     except Exception as e:
         health_status["status"] = "unhealthy"
         health_status["database"] = f"down: {str(e)}"