-- One-shot: run in Supabase Dashboard → SQL Editor.
-- Adds per-match escrow accounting columns used by collect_match_entries / settle_match_reward.

alter table public.matches
  add column if not exists escrow_user_id bigint null,
  add column if not exists entries_collected_at timestamp with time zone null,
  add column if not exists settled_at timestamp with time zone null;

do $$
begin
  if not exists (
    select 1
    from pg_constraint
    where conname = 'matches_escrow_user_id_fkey'
  ) then
    alter table public.matches
      add constraint matches_escrow_user_id_fkey
      foreign key (escrow_user_id) references public.users (id);
  end if;
end $$;

comment on column public.matches.escrow_user_id is
  'Dedicated users row holding this match pot (username match_escrow_<id>); set on first successful collect.';
comment on column public.matches.entries_collected_at is
  'When both players entry fees were moved into escrow; null until collect succeeds.';
comment on column public.matches.settled_at is
  'When prize + house fee were paid from escrow; null until settle succeeds.';