-- search for process_history DB
select coalesce(max(datname), '') as db
from pg_database
where datname = 'process_history'
\gset
-- if we found process_history DB then connect to it, otherwise stay in current DB
\c :db

do '
begin
-- check if we connected to process_history DB
if not exists(select where current_database() = ''process_history'') then
    return;
    end if;
-- clean table bpm_history_process
truncate table only bpm_history_process;
-- clean table bpm_history_task
truncate table only bpm_history_task;
end
';
