I tried to upgrade discourse and got the following message -
I, [2021-01-21T18:39:25.045454 #1] INFO -- : > cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate'
2021-01-21 18:39:32.724 UTC  discourse@discourse LOG: duration: 336.116 ms statement: UPDATE users
SET locale = 'en_GB'
WHERE locale = 'en'
2021-01-21 18:39:33.373 UTC  discourse@discourse ERROR: duplicate key value violates unique constraint "index_users_on_username_lower"
2021-01-21 18:39:33.373 UTC  discourse@discourse DETAIL: Key (username_lower)=(xyz123) already exists.
2021-01-21 18:39:33.373 UTC  discourse@discourse STATEMENT: UPDATE users
SET locale = 'en'
WHERE locale = 'en_US'
StandardError: An error has occurred, this and all later migrations canceled:
I tried to do ./launcher enter app and su postgres -c 'psql discourse', got the following error -
psql: error: could not connect to server: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket “/var/run/postgresql/.s.PGSQL.5432”?
root@ip–app:/var/www/discourse# cat /var/log/postgresql/postgresql-12-main.log
2021-01-21 18:12:04.965 UTC  FATAL: database files are incompatible with server
2021-01-21 18:12:04.965 UTC  DETAIL: The data directory was initialized by PostgreSQL version 13, which is not compatible with this version 12.3 (Debian 12.3-1.pgdg100+1).
pg_ctl: could not start server
Examine the log output.