1create table if not exists providers (
 2    id serial primary key,
 3    name text not null
 4);
 5
 6create unique index uix_providers_on_name on providers (name);
 7
 8create table if not exists models (
 9    id serial primary key,
10    provider_id integer not null references providers (id) on delete cascade,
11    name text not null
12);
13
14create unique index uix_models_on_provider_id_name on models (provider_id, name);
15create index ix_models_on_provider_id on models (provider_id);
16create index ix_models_on_name on models (name);