With regard database, please dont be trying to delete tables out of there unless you are 100% sure on what you are doing. This could cause you more issues than you are trying to solve, and at present I note from your other ticket, you already have issues with your mysql setup.
In terms of the items above, some of these are simply not an option, such as deleting tags that are no longer used. They are always retained. Other items I would need an example of, such as slugs not attached to an item, as there shouldnt be any.
In terms of content items such as comments and posts, there wouldnt be any that dont have a category, as they have to belong somewhere.
This leaves attachments. I understand you may wish to clean up attachments which have been orphaned from older releases, but please bear in mind this is an issue from older releases and shouldnt need a tool for them, as the situation itself no longer occurs.
I would ask yourself what issue you are trying to solve here, as you appear to be causing yourself more problems than you are resolving at present. This is certainly not a dig in any way, but more of an observation.