(feat) add function to get the candles

quants_lab/utils/data_management.py

@@ -0,0 +1,22 @@
+import os
+
+import pandas as pd
+
+
+def get_dataframe(exchange: str, trading_pair: str, interval: str) -> pd.DataFrame:
+    """
+    Get a dataframe of market data from the database.
+    :param exchange: Exchange name
+    :param trading_pair: Trading pair
+    :param interval: Interval of the data
+    :return: Dataframe of market data
+    """
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    data_dir = os.path.join(script_dir, "../../data/candles")
+    filename = f"candles_{exchange}_{trading_pair.upper()}_{interval}.csv"
+    file_path = os.path.join(data_dir, filename)
+    if not os.path.exists(file_path):
+        raise FileNotFoundError(f"File '{file_path}' does not exist.")
+    df = pd.read_csv(file_path)
+    df["timestamp"] = pd.to_datetime(df["timestamp"], unit="ms")
+    return df