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PG::Error: ERROR: new encoding (UTF8) is incompatible

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;