Bug overview description.
https://e621.net/post/index/1/arttags:0 returns posts with artist tags

What part(s) of the site page(s) are affected?
https://e621.net/post/index

What is the expected behavior?
https://e621.net/post/index/1/arttags:0 should only return posts without artist tags

What actual behavior is given instead?
See above.

Time of incident (if applicable).
n/a

Can you reproduce the bug every time?
yes

What steps did you take to replicate this bug?
See above.

Errors or other messages returned (if any).
n/a

This will be slowly resolved as the site catches up after the downtime. When the database "goes away" the background workers become unhappy and fall behind.