Upgrade schemas to Rails 8.1 (#54)

Reviewed-on: #54

config/recurring.yml

@@ -0,0 +1,10 @@
+# production:
+#   periodic_cleanup:
+#     class: CleanSoftDeletedRecordsJob
+#     queue: background
+#     args: [ 1000, { batch_size: 500 } ]
+#     schedule: every hour
+#   periodic_command:
+#     command: "SoftDeletedRecord.due.delete_all"
+#     priority: 2
+#     schedule: at 5am every day