Handle JSON error

app.py

@@ -8,6 +8,9 @@ from database import engine, receipts
 
 # Fetch all data from the 'receipts' table
 def get_receipts_table():
+    """
+    Fetch all rows from the receipts table and return as a Pandas DataFrame.
+    """
     try:
         with engine.connect() as con:
             result = con.execute(text("SELECT * FROM receipts"))
@@ -22,6 +25,15 @@ def get_receipts_table():
 
 @tool
 def sql_engine(query: str) -> str:
+    """
+    Executes an SQL query on the database and returns the result.
+
+    Args:
+        query (str): The SQL query to execute.
+    
+    Returns:
+        str: Query result as a formatted string.
+    """
     try:
         with engine.connect() as con:
             rows = con.execute(text(query)).fetchall()