Fix: Mock data timestamps for intraday ranges to prevent overwriting points

alphavantage_mcp.py

@@ -164,7 +164,7 @@ async def get_market_data(payload: dict):
             t = current_time - (time_delta * (num_points - i - 1))
             
             # Format timestamp based on data type
-            if time_range == "INTRADAY":
+            if time_range in ["INTRADAY", "1D", "3D", "1W"]:
                 timestamp_str = t.strftime("%Y-%m-%d %H:%M:%S")
             else:
                 timestamp_str = t.strftime("%Y-%m-%d")