ore/conf/evolutions/default/27.sql
# --- !Ups
alter table versions drop constraint versions_channel_id_version_string_key;
create unique index on versions (project_id, version_string);
# --- !Downs
alter table versions drop constraint versions_project_id_version_string_key;
create unique index versions_channel_id_version_string_key on versions (channel_id, version_string);