fix timestamp issue

app/sheets.py

@@ -152,14 +152,26 @@ class SheetsClient:
             values = result.get('values', [])
             # logger.info(f"[DEBUG] Gsheet values {values}")
             # Đảm bảo timestamp là str
+            ts = datetime.now().isoformat()
+            # Đảm bảo timestamp luôn là list
             if timestamp is None:
-                from datetime import datetime
-                timestamp = datetime.now().isoformat()
+                timestamp = []
+            elif not isinstance(timestamp, list):
+                timestamp = [timestamp]
             # Chống trùng bản ghi dựa trên sender_id, page_id, timestamp
             for row in values:
-                if len(row) >= 12:
-                    row_timestamp = row[12] if len(row) > 12 else ""
-                    if str(row_timestamp) == str(timestamp) and str(row[4]) == str(recipient_id) and str(row[5]) == str(page_id):
+                if len(row) >= 13:
+                    try:
+                        row_timestamps = json.loads(row[12]) if row[12] else []
+                    except Exception:
+                        row_timestamps = []
+                    if not isinstance(row_timestamps, list):
+                        row_timestamps = [row_timestamps]
+                    if not isinstance(row_timestamps, list):
+                        row_timestamps = [row_timestamps]
+                    row_recipient_id = row[4]
+                    row_page_id = row[5]
+                    if (str(timestamp) in [str(ts) for ts in row_timestamps] and str(row_recipient_id) == str(recipient_id) and str(row_page_id) == str(page_id)):
                         logger.info(f"Found duplicate conversation for user {recipient_id}, page {page_id}, timestamp {timestamp}")
                         return {
                             'conversation_id': row[0],