Unable to execute psql with postgres user

After a server failure I'm not able to execute psql like psql -U postgres nor like sudo -u postgres psql. In both cases I'm asked for the user password despite I've modified the pg_hba.conf files to trust all local connections and I've tried virtually all proposed solutions along the web. Would it be possible to delete the postgres user and re-create it without loosing the data? That's assuming the issue might be that the user got corrupted during the system failure. ## Detailed info * Logs at /var/lib/pgsql/15/data/log are all empty. * Service status looks like: * /var/lib/pgsql/15/data/pg_hba.conflooks like -after some changes to try to login wihout password: * /var/lib/pgsql/data/pg_hba.conf looks like: