Add rollback.

crawlers/mooncrawl/mooncrawl/stats_worker/dashboard.py

@@ -244,8 +244,18 @@ def generate_metrics(
             print("--- value_in %s seconds ---" % (time.time() - start_time))
 
     except Exception as err:
-        print(err)
-        pass
+        db_session.rollback()
+        reporter.error_report(
+            err,
+            [
+                "dashboard",
+                "metrics",
+                "statistics",
+                f"metrics:{','.join(metrics)}"
+                f"blockchain:{blockchain_type}"
+                f"address:{address}",
+            ],
+        )
 
     return results
 
@@ -808,6 +818,7 @@ def stats_generate_handler(args: argparse.Namespace):
                             dashboard_id=dashboard.id,
                         )
                 except Exception as err:
+                    db_session.rollback()
                     reporter.error_report(
                         err,
                         [