Optional backup storage setup.

SQL table

create table if not exists public.hmg_backup_storage (
  id uuid primary key default gen_random_uuid(),
  owner_key text not null,
  namespace text not null default 'academy_v5',
  payload jsonb not null,
  updated_at timestamptz default now()
);
create unique index if not exists hmg_backup_unique on public.hmg_backup_storage(owner_key, namespace);
alter table public.hmg_backup_storage enable row level security;
create policy "anon insert backup" on public.hmg_backup_storage for insert to anon with check (true);
create policy "anon read own backup by key" on public.hmg_backup_storage for select to anon using (true);
create policy "anon update backup" on public.hmg_backup_storage for update to anon using (true) with check (true);

For a production school deployment, tighten RLS around authenticated users. This static demo uses backup keys, so do not store highly sensitive data.

Config file

1. Copy `assets/js/config.example.js` to `assets/js/config.js`.
2. Paste your Supabase project URL and anon key.
3. Keep table name as `hmg_backup_storage` unless changed.
4. Deploy again.
5. Use `backup-center.html` to save and restore.