Feature request: Add timestamp columns

[petemcfarlane]

Hi, what do you think about adding timestamp columns to the database table fun_with_flags_toggles? We wanted to build some tooling to show which flags have not been used recently, to help us clean them up but we don't know when they were last used. Or do you have any other suggestions to achieve this? Similar to #173 Thanks

[tompave]

Hey there, thank you for the suggestion.

I would be happy to add this to the package. In fact, it was already attempted in #154. That PR was initially merged but later I had to revert it because of some problems. My comment in the PR explains why.

It can be done with some more work.

[tompave]

Also discussed in: #194
This is being done in: #195