Restore the auth.users signup trigger lost in the dev2 move

sites/sh1pt.com/supabase/migrations/20260926210000_restore_auth_storage_lost_in_dev2_move.sql

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+-- Restore the trigger on auth.users that the 2026-09-25 move to the
+-- self-hosted Supabase stack on dev2 left behind.
+--
+-- The move dumped DDL for the app schemas only, and pg_dump files a trigger
+-- under its table's schema, so on_auth_user_created (ON auth.users) was
+-- dropped while public.handle_new_user() survived. From the cutover on, a
+-- magic-link signup got no profiles row: the dashboard finds no profile for
+-- auth.uid() and bounces to /waitlist?error=no-profile, and a referral in
+-- the signup metadata was never recorded.
+--
+-- Replaying every migration, this is the only object the repo creates on an
+-- auth.* or storage.* table. There are no storage policies to restore.
+--
+-- Idempotent: safe to re-run.
+
+-- Final definition: 20260422114210_auth_users_and_profiles.sql. The function
+-- it calls was last redefined in 20260422120159_handle_new_user_upsert_and_wipe.sql
+-- and still exists.
+drop trigger if exists on_auth_user_created on auth.users;
+create trigger on_auth_user_created
+  after insert on auth.users
+  for each row execute function public.handle_new_user();
+
+-- Backfill what handle_new_user() would have written for the users created
+-- while the trigger was missing, with the same upsert on email so a
+-- pre-existing waitlist row is linked rather than duplicated.
+--
+-- The function draws referral_code at random; profiles.referral_code is
+-- unique, so the backfill derives it from the user id instead (same 8-hex
+-- shape, same result on every run) and skips a user in the unlikely case
+-- that code is already taken. The CHECK query reports any user left behind.
+insert into public.profiles (email, handle, referred_by, referral_code, user_id)
+select
+  u.email,
+  nullif(trim(u.raw_user_meta_data ->> 'handle'), ''),
+  nullif(trim(u.raw_user_meta_data ->> 'referred_by'), ''),
+  substr(md5(u.id::text), 1, 8),
+  u.id
+from auth.users u
+where u.email is not null
+  and not exists (select 1 from public.profiles p where p.user_id = u.id)
+  and not exists (
+    select 1 from public.profiles p
+     where p.referral_code = substr(md5(u.id::text), 1, 8)
+  )
+on conflict (email) do update set
+  user_id = excluded.user_id,
+  handle = coalesce(public.profiles.handle, excluded.handle),
+  referred_by = coalesce(public.profiles.referred_by, excluded.referred_by);
+
+-- ... and the referrals row the function adds when the signup metadata named
+-- an existing referral code. Run after the insert above so a referrer who
+-- also signed up during the gap is found. Scoped to users created since the
+-- move; before that the trigger was live and already did this. No email, no
+-- webhook: a referral only accrues credit_cents, paid out when the invitee
+-- pays.
+insert into public.referrals (referred_by, referred_to)
+select referrer.id, p.id
+from auth.users u
+join public.profiles p on p.user_id = u.id
+join public.profiles referrer
+  on referrer.referral_code = trim(u.raw_user_meta_data ->> 'referred_by')
+where u.created_at >= '2026-09-25'
+  and nullif(trim(u.raw_user_meta_data ->> 'referred_by'), '') is not null
+  and referrer.id <> p.id
+on conflict (referred_by, referred_to) do nothing;