-- migrate:up
create table if not exists tenant_channels (
  tenant_id uuid not null references tenants(id) on delete cascade,
  channel_type text not null,           -- 'whatsapp'
  channel_key text not null,            -- e.g. '+5491122334455' or 'PHONE_NUMBER_ID'
  created_at timestamptz not null default now(),
  primary key (channel_type, channel_key)
);

-- migrate:down
drop table if exists tenant_channels;