User prompt for migration and updated README

nodes/node_balancer/README.md

@@ -113,3 +113,14 @@ For Web3 providers `access_id` and `data_source` could be specified in headers
 ```bash
 /usr/local/go/bin/go test -run ^TestCleanInactiveClientNodes$ github.com/bugout-dev/moonstream/nodes/node_balancer/cmd/nodebalancer -v -count=1
 ```
+
+## Migrations
+
+To run migration:
+
+```bash
+python migrations/migrations.py run --key 20230522 \
+    --token-current-owner "$NB_CONTROLLER_TOKEN" \
+    --token-new-owner "$MOONSTREAM_ADMIN_OR_OTHER_CONTROLLER" \
+    --new-application-id "$MOONSTREAM_APPLICATION_ID"
+```

nodes/node_balancer/migrations/migrations.py

@@ -1,9 +1,6 @@
 import argparse
-import csv
-import json
 import logging
 import os
-import uuid
 from typing import Any, Dict, List
 
 from bugout.app import Bugout
@@ -26,6 +23,9 @@ def migration_20230522(
 
     logger.info(f"Found {len(resources.resources)} resources")
 
+    while input("Do you want to continue [y/n]? ") != "y":
+        return
+
     cnt = 0
     for resource in resources.resources:
         resource_data = resource.resource_data