If I have a Bitbucket instance with X number of Projects, I would like a way to update each Project's Pull request description template to a custom template.

This might be achieved either via the UI or a REST API endpoint.

Currently this can be achieved via a DB insert command such as:

insert into bb_pull_request_template (select id + <iterator>, scope_id + <iterator>, scope_type, description, enabled from bb_pull_request_template where id = <some_starting_number>);

But manual manipulation of the db is highly discouraged.