1create table if not exists usages (
 2    id serial primary key,
 3    user_id integer not null,
 4    model_id integer not null references models (id) on delete cascade,
 5    requests_this_minute integer not null default 0,
 6    tokens_this_minute bigint not null default 0,
 7    requests_this_day integer not null default 0,
 8    tokens_this_day bigint not null default 0,
 9    requests_this_month integer not null default 0,
10    tokens_this_month bigint not null default 0
11);
12
13create index ix_usages_on_user_id on usages (user_id);
14create index ix_usages_on_model_id on usages (model_id);
15create unique index uix_usages_on_user_id_model_id on usages (user_id, model_id);