-- Game Night Live — countdown timer for the scoreboard.
-- One timer per event, set from the control room. Run after 0001_init.sql.
--
-- State is stored so that any screen can work out the time left on its own:
--   running  : timer_ends_at is set (time left = timer_ends_at - now)
--   paused   : timer_ends_at is null, timer_remaining_ms holds what was left
--   reset    : timer_ends_at is null, timer_remaining_ms is null (= full duration)

alter table events
  add column timer_visible      boolean not null default false,
  add column timer_duration_ms  int     not null default 60000
    check (timer_duration_ms between 1000 and 86400000),
  add column timer_remaining_ms int     check (timer_remaining_ms >= 0),
  add column timer_ends_at      timestamptz;