feat: Add resilience hardening for csv parser

app/utils/csv_parser.py

@@ -75,14 +75,24 @@ def parse_and_validate_csv(content: bytes) -> List[Dict[str, Any]]:
             else None
         )
 
-        if not all([txn_id, date_str, amount_str, merchant]):
+        if not all([date_str, amount_str, merchant]):
             raise InvalidCSVException(
-                f"Row {line_num}: Empty values are not allowed in required fields"
+                f"Row {line_num}: Empty values are not allowed in required fields (date, amount, merchant)"
             )
 
+        # Auto-generate txn_id if missing or empty
+        if not txn_id or not txn_id.strip():
+            import uuid
+            txn_id = f"GEN_{uuid.uuid4().hex[:8].upper()}"
+        else:
+            txn_id = txn_id.strip()
+
         # Validate amount
+        cleaned_amount_str = (
+            amount_str.strip().replace("$", "").replace("₹", "").replace(",", "")
+        )
         try:
-            amount = float(amount_str.strip())
+            amount = float(cleaned_amount_str)
         except ValueError as e:
             raise InvalidCSVException(
                 f"Row {line_num}: Invalid amount '{amount_str}'. Must be a number."