PostGreSQL

sudo -u postgres psql
create database mydb;
create user myuser with encrypted password 'mypass';
grant all privileges on database mydb to myuser;

First, we need to drop template1. Templates can’t be dropped, so we first modify it so t’s an ordinary database:

UPDATE pg_database SET datistemplate = FALSE WHERE datname = 'template1';

Now we can drop it:

DROP DATABASE template1;

Now its time to create database from template0, with a new default encoding:

CREATE DATABASE template1 WITH TEMPLATE = template0 ENCODING = 'UNICODE';

Now modify template1 so it’s actually a template:

UPDATE pg_database SET datistemplate = TRUE WHERE datname = 'template1';

Now switch to template1 and VACUUM FREEZE the template:

\c template1
VACUUM FREEZE;

Problem should be resolved.