When you migrate list or site, the user alerts in the site will not be migrated together with the content. Below content can help you to do this task. But please take care of it, if you operate it on Prod environment.
Enable or disable alerts for Web application
Create Alert in SharePoint using PowerShell
Get all Alerts for an user in SharePoint with PowerShell
Create Alerts for All users in a Group
Update SharePoint Alerts using PowerShell
Get Alerts for a Particular User
Find All Alerts of an User in Entire Site collection
Delete All SharePoint alerts from a List using powershell
Delete user alerts in SharePoint 2010 with PowerShell
To delete all alerts:
Filter the alerts for a single list:
Find all the Alerts for a specific user across the web:
Get all the alerts for a user across the entire site collection:
Export User Alerts
Import User Alerts
Original: https://www.cnblogs.com/Bear-Study-Hard/p/4958125.html
Author: 努力学习的小熊
Title: How to Operate SharePoint User Alerts with PowerShell
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