Track the last read message by user
add grouptouser pillow
Merge branch 'master' of github.com:dimagi/commcare-hq
Mark last read message in chat window
add preindex functionality for GroupToUser pillow
add fast_reindex_groupstousers to the preindex_everything workflow
correctly add the fast_reindex_groupstousers to the preindex workflow
update pillowtop
explicitly reset the index instead of using hacky sleep()
update pillowtop
use single vellum includes

Depends on https://github.com/dimagi/Vellum/pull/156
trigger user reindex
Merge branch 'group-pillow' into unknown-users
add pillow for getting unknown users indexed in the user index
Simplify unread message notification
Remove unused variable
remove obsolete management command
add _id to the unknown user doc
serialize translations
having a lingering subscriber error is actually not an error