working on backend

app/database/schema_updates.py

@@ -18,6 +18,32 @@ def ensure_schema_updates(engine: Engine) -> None:
     """Ensure missing columns are added for backward-compatible updates."""
     # Map of table -> {column: SQL type}
     updates: Dict[str, Dict[str, str]] = {
+        # Billing batch history (lightweight persistence)
+        "billing_batches": {
+            "id": "INTEGER",
+            "batch_id": "TEXT",
+            "status": "TEXT",
+            "total_files": "INTEGER",
+            "successful_files": "INTEGER",
+            "failed_files": "INTEGER",
+            "started_at": "DATETIME",
+            "updated_at": "DATETIME",
+            "completed_at": "DATETIME",
+            "processing_time_seconds": "FLOAT",
+            "success_rate": "FLOAT",
+            "error_message": "TEXT",
+        },
+        "billing_batch_files": {
+            "id": "INTEGER",
+            "batch_id": "TEXT",
+            "file_no": "TEXT",
+            "status": "TEXT",
+            "error_message": "TEXT",
+            "filename": "TEXT",
+            "size": "INTEGER",
+            "started_at": "DATETIME",
+            "completed_at": "DATETIME",
+        },
         # Forms
         "form_index": {
             "keyword": "TEXT",