1create table subscription_usage_meters (
2    id serial primary key,
3    subscription_usage_id integer not null references subscription_usages (id) on delete cascade,
4    model_id integer not null references models (id) on delete cascade,
5    requests integer not null default 0
6);
7
8create unique index uix_subscription_usage_meters_on_subscription_usage_model on subscription_usage_meters (subscription_usage_id, model_id);