Remove deleted entries if not accessed in the last 90 days

[ajeetdsouza]

No description provided.

[kidonng]

I was going to comment before you merge, but something else distracted me 😅
My concern is that, the entry must be at a incredibly high score to survive from aging in 90 days. I assume most unused entries don't last a week, for a regular user. Is there any real life scenario this new mechanism will actually run?

[ajeetdsouza]

I think the answer to this is - it depends on how you use zoxide.

• If you use a lot of temp directories while working, you might have a large number of entries in your database that no longer exist.
• If you don't want zoxide to forget, you might have set _ZO_MAXAGE to a very high value. The default value is also fairly high at 10000, and some users may not reach it for a while.
• Deleted entries are rarely a problem for the z command, since it only needs to find the first match (which is usually not deleted). However, commands like zi or zoxide query -l would slow down with more directories, since they have to make a lot of stat() system calls.

On my system, the number of directories in my database dropped by half after merging this PR.

zoxide query --list --all | wc -l # original number of directories
# build zoxide on the latest master

zoxide query --list # this will trigger a scan of the entire database
zoxide query --list --all | wc -l # new number of directories