Update server.py

server.py

@@ -17,7 +17,7 @@ except ImportError:
     HF_DATASETS_AVAILABLE = False
     Features, Value = None, None
 
-STORAGE_BACKEND_CONFIG = os.getenv("STORAGE_BACKEND", "HF_DATASET").upper()
+STORAGE_BACKEND_CONFIG = os.getenv("STORAGE_BACKEND", "JSON").upper()
 HF_DATASET_REPO = os.getenv("HF_DATASET_REPO")
 HF_TOKEN = os.getenv("HF_TOKEN")
 DB_FILE_JSON = "social_data.json"
@@ -75,9 +75,8 @@ def load_data():
     global STORAGE_BACKEND_CONFIG
     storage_backend = STORAGE_BACKEND_CONFIG
     
-    # Define explicit dtypes for empty dataframes to ensure schema consistency
     posts_schema = {"post_id": "int64", "username": "object", "content": "object", "timestamp": "object"}
-    comments_schema = {"comment_id": "int64", "post_id": "int64", "username": "object", "content": "object", "timestamp": "object", "reply_to_comment_id": "float64"} # Use float for optional int
+    comments_schema = {"comment_id": "int64", "post_id": "int64", "username": "object", "content": "object", "timestamp": "object", "reply_to_comment_id": "float64"}
 
     with db_lock:
         users = {"admin": "password"}