added bank code and filename as composite key for ach_processed_files table

db/repository.py

@@ -107,22 +107,23 @@ class Repository:
             cursor.close()
             conn.close()
 
-    def is_file_processed(self, filename: str) -> bool:
+    def is_file_processed(self, filename: str, bankcode: str) -> bool:
         """
-        Check if file has already been processed.
+        Check if file has already been processed for a specific bank.
 
         Args:
             filename: Name of the file to check
+            bankcode: Bank code to check
 
         Returns:
-            True if file is in processed list, False otherwise
+            True if file is in processed list for this bank, False otherwise
         """
         conn = self.connector.get_connection()
         try:
             cursor = conn.cursor()
             cursor.execute(
-                "SELECT COUNT(*) FROM ach_processed_files WHERE filename = :filename",
-                {'filename': filename}
+                "SELECT COUNT(*) FROM ach_processed_files WHERE filename = :filename AND bankcode = :bankcode",
+                {'filename': filename, 'bankcode': bankcode}
             )
             count = cursor.fetchone()[0]
             return count > 0