updates the form validation state immediately after any change to the slack token.

Fix duplicate "user joined" activity feed entries

Fix broken pivot table due to null dimension values

actively close db connection pools when database is deleted

Fix table sorting when clicking column header

Be more conservative with our popover z-index. Fixes tutorial page flag.

fixes #2448 by reworking the logic for determining when it's a users first login.  we no longer lookup the first session for the user because it's possible they logged out and deleted their only session, then logged in to create their "first" session.  we now use the :last_login timestamp on the User record, which is more consistent and accurate.

Fix intermittent BigQuery CI failures 

fire off an event when a database is deleted so that we can inform drivers and in the case of the generic-sql driver it can shutdown the connection pool for the db we deleted.  i suspect this fixes #2374

basic scaffolding for sending a one-time follow up email to users.

Fix updating a label name 

Use report-timezone for Druid QP 

Saved Questions Tweaks

add fonts and fontconfig package. includes locale env vars.