-- Move live-listener ownership fully to the account boundary.
--
-- `live_sources.owner_user_id` and `cookiecloud_credentials.user_id` already
-- enforce one listener configuration and one credential source per account.
-- The component-level `source_id` foreign key was therefore redundant and,
-- more importantly, made new component kinds look as though they selected
-- their own upstream listener. Components now subscribe to their owner's
-- canonical event stream and retain only their account ownership.

DROP INDEX IF EXISTS component_instances_source_idx;

ALTER TABLE component_instances
  DROP CONSTRAINT IF EXISTS component_instances_owner_user_id_source_id_fkey;

ALTER TABLE component_instances
  DROP COLUMN IF EXISTS source_id;

CREATE INDEX IF NOT EXISTS component_instances_owner_enabled_idx
  ON component_instances(owner_user_id, enabled, created_at);

COMMENT ON TABLE live_sources IS
  'One immutable Bilibili live-listener configuration per account.';
COMMENT ON TABLE cookiecloud_credentials IS
  'One encrypted CookieCloud credential source per account.';
COMMENT ON TABLE component_instances IS
  'Account-owned consumers of the owning account live-event stream.';