-- A seventh termination reason: GatewayFailure.
--
-- 000006 chose a CHECK over an enum type so that "a new termination reason
-- should be a migration, but not one that requires ALTER TYPE". This is that
-- migration.
--
-- Until now the model provider failing — rate limited, request rejected, key
-- refused, unreachable — was recorded as ToolFailure, because the enum had no
-- other place for it. On 2026-09-22 that was 131 of 318 production runs, of
-- which not one was a tool failing. The distinction is the difference between
-- "what did we break" and "what are we not paying for", and the column that
-- every dashboard and eval groups by could not make it.
--
-- Existing rows are left as they are. Rewriting history from the trajectory
-- text would be guesswork against a message format that has changed twice;
-- the trajectory entries still carry the gateway.* error code for anyone who
-- needs to reclassify the past.
ALTER TABLE agent_runs DROP CONSTRAINT agent_runs_termination_check;
ALTER TABLE agent_runs ADD CONSTRAINT agent_runs_termination_check CHECK (termination IN (
  'Completed', 'BudgetExceeded', 'Deadline',
  'ConfirmationPending', 'ToolFailure', 'Refused', 'GatewayFailure'
));