Failed to bootstrap, also 500 error loading any page

[Steven]

If you have a recent backup maybe this could help :

@riking

Example: Delete a corrupted database

Sometimes you screw up the database and need to restore from a backup. However, if the broken database is making the site unusable, you may not be able to get to /admin/backups to upload and restore the old backup. When this happens, you will want to nuke the database.

From the host:

root@discourse:~# cd /var/discourse
root@discourse:/var/discourse# ./launcher destroy app
root@discourse:/var/discourse# echo rm -rv shared/standalone/postgres_*
rm -rv shared/standalone/postgres_backup shared/standalone/postgres_data shared/standalone/postgres_data_old shared/standalone/postgres_run
root@discourse:/var/discourse# ./launcher bootstrap app
root@discourse:/var/discourse# ./launcher start app

(Source)