ALTER TABLE tasks
  ADD COLUMN IF NOT EXISTS success_receipt jsonb,
  ADD COLUMN IF NOT EXISTS success_receipt_at timestamptz,
  ADD COLUMN IF NOT EXISTS error_summary jsonb,
  ADD COLUMN IF NOT EXISTS error_summary_at timestamptz;

CREATE INDEX IF NOT EXISTS tasks_success_receipt_idx
  ON tasks (organization_id, success_receipt_at DESC)
  WHERE success_receipt IS NOT NULL;

CREATE INDEX IF NOT EXISTS tasks_error_summary_idx
  ON tasks (organization_id, error_summary_at DESC)
  WHERE error_summary IS NOT NULL;