added one file for delete user

src/migrations/2020040216038-remove-deleteduser-from-relationgroup.js

@@ -0,0 +1,24 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:adjust-pages-path');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+module.exports = {
+  async up(db) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const User = require('@server/models/user')();
+    const UserGroupRelation = require('@server/models/user-group-relation')();
+
+    const deletedUsers = await User.find({ status: 4 }); // deleted user
+    await UserGroupRelation.remove({ relatedUser: deletedUsers });
+
+    logger.info('Migration has successfully applied');
+  },
+
+  down(db) {
+    // do not rollback
+  },
+};