-- 0022_fleet_updates.sql
--
-- Tables backing the rolling fleet-update worker (P6-02). One row in
-- fleet_updates per "update all" invocation, a child row per host so
-- the worker can iterate in position order, report progress, and
-- record per-host outcome. Halt-on-fail semantics live in the worker
-- (internal/server/fleetupdate); this schema just captures state.

CREATE TABLE fleet_updates (
  id                 TEXT PRIMARY KEY,
  started_at         TEXT NOT NULL,
  started_by_user_id TEXT NOT NULL REFERENCES users(id),
  target_version     TEXT NOT NULL,
  status             TEXT NOT NULL CHECK (status IN
                          ('running','completed','halted','cancelled')),
  current_host_id    TEXT REFERENCES hosts(id),
  halted_reason      TEXT,
  completed_at       TEXT
);

CREATE INDEX fleet_updates_status ON fleet_updates(status);

CREATE TABLE fleet_update_hosts (
  fleet_update_id TEXT NOT NULL REFERENCES fleet_updates(id) ON DELETE CASCADE,
  host_id         TEXT NOT NULL REFERENCES hosts(id) ON DELETE CASCADE,
  position        INTEGER NOT NULL,
  status          TEXT NOT NULL CHECK (status IN
                       ('pending','running','succeeded','failed','skipped')),
  job_id          TEXT REFERENCES jobs(id) ON DELETE SET NULL,
  failed_reason   TEXT,
  PRIMARY KEY (fleet_update_id, host_id)
);

CREATE INDEX fleet_update_hosts_position
  ON fleet_update_hosts(fleet_update_id, position);