Update app.py

app.py

@@ -11,8 +11,18 @@ exchange = ccxt.mexc({
     'enableRateLimit': True,
 })
 
+#def fetch_ohlcv_data(symbol, timeframe, limit):
+    #return exchange.fetch_ohlcv(symbol, timeframe, since=None, limit=limit)
+
 def fetch_ohlcv_data(symbol, timeframe, limit):
-    return exchange.fetch_ohlcv(symbol, timeframe, since=None, limit=limit)
+    data = []
+    start_time = None
+    while len(data) < limit:
+        ohlcv_data = exchange.fetch_ohlcv(symbol, timeframe, since=start_time, limit=limit)
+        data.extend(ohlcv_data)
+        start_time = ohlcv_data[-1][0] + 1
+    return data
+
 
 def data_to_dataframe(data):
     df = pd.DataFrame(data, columns=['timestamp', 'open', 'high', 'low', 'close', 'volume'])