After backing up your database you can run the following.
db.objects.update({_key: {$regex: /^user:\d+$/}}, {$set: {"signature": ''}}); This will match all user documents and set the signature field to empty string.
You can click on the headers in the table to change the sorting. Inactive filter was just displaying users who haven't logged in the past x months so you can change sorting to last online sorted by ascending and see inactive users.
@Varun-Ganesh-D After updating what? Do not know jack about SES but seems whacked to me that updating only NodeBB would result in such. Perchance might some other, more system wide updates also been in the lurking? 🤔
Presuming you have cli access, what returns when thou drivest the following:
For 1 I would be inclined to use clustering then reverse proxy the subdomains to categories. Rather than spooling individual instances for each. I've done this at my own site.
dnb.35hz.co.uk will take you to the electronic category.
You could then make a few changes to how your homepage/main website looks and do it that way.
As an additional. Anything you're not sure exists, drop an email to sales [at]nodebb.org and they may be able to create what you need.