Fix KeyError for prefixed coins in historical candle fetch

Bypass SDK's name_to_coin lookup in candles_snapshot by calling
http_info.post directly with the raw coin name. This fixes
KeyError for symbols like xyz:GOLD, xyz:CL, mkts:USTECH that
aren't in the name_to_coin dictionary.

The WebSocket subscription already bypassed this lookup (line 154),
but the historical fetch path did not.

data_fetcher.py

@@ -18,7 +18,7 @@ from logging_utils import setup_logging
 
 class CandleFetcherDB:
     """
-    Fetches 1-minute candle data and saves/updates it directly in an SQLite database.
+    Fetches 1-minute candle data and saves/updates it directly in a PostgreSQL database.
     """
 
     def __init__(self, coins_to_fetch: list, interval: str, days_back: int):
@@ -112,7 +112,7 @@ class CandleFetcherDB:
         df.sort_values(by='t', inplace=True)
 
         if not df.empty:
-            return self._save_to_sqlite_with_pandas(df, coin, table_existed)
+            return self._save_to_db_with_pandas(df, coin, table_existed)
         else:
             logging.info(f"No new candles to append for {coin}.")
             return 0
@@ -138,7 +138,8 @@ class CandleFetcherDB:
         max_retries = 3
         for attempt in range(max_retries):
             try:
-                return self.info.candles_snapshot(coin, self.interval, start_ms, end_ms)
+                req = {"coin": coin, "interval": self.interval, "startTime": start_ms, "endTime": end_ms}
+                return self.info.post("/info", {"type": "candleSnapshot", "req": req})
             except ClientError as e:
                 if e.status_code == 429 and attempt < max_retries - 1:
                     logging.warning("Rate limited. Retrying...")
@@ -148,7 +149,7 @@ class CandleFetcherDB:
                     return None
         return None
 
-    def _save_to_sqlite_with_pandas(self, df: pd.DataFrame, coin: str, is_append: bool) -> int:
+    def _save_to_db_with_pandas(self, df: pd.DataFrame, coin: str, is_append: bool) -> int:
         """Saves a pandas DataFrame to a PostgreSQL table and returns the number of saved rows."""
         table_name = db.sanitize_table_name(coin, self.interval)
         try:
@@ -175,7 +176,7 @@ class CandleFetcherDB:
 
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="Fetch historical candle data and save to SQLite.")
+    parser = argparse.ArgumentParser(description="Fetch historical candle data and save to PostgreSQL.")
     parser.add_argument(
         "--coins",
         nargs='+',

data_fetcher_old.py

@@ -162,7 +162,8 @@ class CandleFetcher:
         max_retries = 3
         for attempt in range(max_retries):
             try:
-                return self.info.candles_snapshot(coin, self.interval, start_ms, end_ms)
+                req = {"coin": coin, "interval": self.interval, "startTime": start_ms, "endTime": end_ms}
+                return self.info.post("/info", {"type": "candleSnapshot", "req": req})
             except ClientError as e:
                 if e.status_code == 429 and attempt < max_retries - 1:
                     logging.warning("Rate limited. Retrying in 2 seconds...")

live_candle_fetcher.py

@@ -108,7 +108,8 @@ class LiveCandleFetcher:
         while current_start < end_ms:
             try:
                 http_info = Info(constants.MAINNET_API_URL, skip_ws=True)
-                batch = http_info.candles_snapshot(coin, "1m", current_start, end_ms)
+                req = {"coin": coin, "interval": "1m", "startTime": current_start, "endTime": end_ms}
+                batch = http_info.post("/info", {"type": "candleSnapshot", "req": req})
                 if not batch:
                     break 
                 
@@ -158,7 +159,20 @@ class LiveCandleFetcher:
         print("\nListening for live candle data... Press Ctrl+C to stop.")
         try:
             while True:
+                try:
                     time.sleep(1)
+                except Exception as e:
+                    logging.error(f"WebSocket connection lost: {e}")
+                    self.info.ws_manager.stop()
+                    time.sleep(5)
+                    self.info = Info(constants.MAINNET_API_URL, skip_ws=False)
+                    for coin in self.coins_to_watch:
+                        callback = lambda msg, c=coin: self.on_message({**msg, 'data': {**msg.get('data',{}), 'coin': c}})
+                        subscription = {"type": "candle", "coin": coin, "interval": "1m"}
+                        self.info.ws_manager.subscribe(subscription, callback)
+                        logging.info(f"Re-subscribed to 1m candles for {coin}")
+                        time.sleep(0.2)
+                    print("\nReconnected. Listening for live candle data...")
         except KeyboardInterrupt:
             print("\nStopping WebSocket listener...")
             self.info.ws_manager.stop()

scripts/gap_detector.py

@@ -87,7 +87,8 @@ def detect_and_fill_gaps(coin, conn):
         current_start = gap_start_ms
         while current_start < gap_end_ms:
             try:
-                batch = info.candles_snapshot(coin, "1m", current_start, gap_end_ms)
+                req = {"coin": coin, "interval": "1m", "startTime": current_start, "endTime": gap_end_ms}
+                batch = info.post("/info", {"type": "candleSnapshot", "req": req})
                 if not batch:
                     break