Only add SQLALCHEMY_ENGINE_OPTIONS under production databases

CTFd/config.py

@@ -246,6 +246,7 @@ class Config(object):
     UPDATE_CHECK = not os.getenv("UPDATE_CHECK")  # Defaults True
     APPLICATION_ROOT = os.getenv("APPLICATION_ROOT") or "/"
     SERVER_SENT_EVENTS = not os.getenv("SERVER_SENT_EVENTS")  # Defaults True
+    if DATABASE_URL.startswith("sqlite") is False:
         SQLALCHEMY_ENGINE_OPTIONS = {
             "max_overflow": int(os.getenv("SQLALCHEMY_MAX_OVERFLOW", 20))
         }