test updates to take into account exception management

app/services/auth_service.py

@@ -170,16 +170,6 @@ class AuthService:
         """Check if username already exists."""
         return db.query(User).filter(User.username == username).first() is not None
 
-    # Legacy methods for backward compatibility (deprecated)
-    def email_exists(self, db: Session, email: str) -> bool:
-        """Check if email already exists. DEPRECATED: Use proper exception handling."""
-        logger.warning("email_exists is deprecated, use proper exception handling")
-        return self._email_exists(db, email)
-
-    def username_exists(self, db: Session, username: str) -> bool:
-        """Check if username already exists. DEPRECATED: Use proper exception handling."""
-        logger.warning("username_exists is deprecated, use proper exception handling")
-        return self._username_exists(db, username)
 
 
 # Create service instance following the same pattern as other services