create table buckets(
  id bigserial primary key,
  group_id bigint not null references groups(id) on delete cascade,
  created_by bigint not null references users(id),
  name text not null,
  description text,
  icon_key text,
  budget_limit_dollars numeric(12,2),
  position integer not null default 0,
  created_at timestamptz not null default now()
);

create index buckets_group_id_idx on buckets(group_id);

create table bucket_tags(
  bucket_id bigint not null references buckets(id) on delete cascade,
  tag_id bigint not null references tags(id) on delete cascade,
  created_at timestamptz not null default now(),
  primary key (bucket_id, tag_id)
);

create index bucket_tags_bucket_idx on bucket_tags(bucket_id);
create index bucket_tags_tag_idx on bucket_tags(tag_id);