feat(#55): Enable deleting account and anonymising purchases and subscriptions (no email sending)

supabase/migrations/20241029193900_account_deletion.sql

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+create table account_deletion_requests (
+  user_id uuid references auth.users not null primary key,
+  token text not null,
+  requested_at timestamp with time zone default now() not null
+);
+
+alter table account_deletion_requests enable row level security;
+create policy "Can view own deletion request data" on account_deletion_requests
+  for select using (auth.uid() = user_id);
+create policy "Can insert own deletion request data" on account_deletion_requests
+  for insert with check (auth.uid() = user_id);
+
+ALTER TABLE customers
+DROP CONSTRAINT IF EXISTS customers_id_fkey;
+ALTER TABLE customers
+ADD CONSTRAINT customers_id_fkey FOREIGN KEY (id) REFERENCES auth.users(id) ON DELETE CASCADE;
+
+ALTER TABLE subscriptions
+DROP CONSTRAINT IF EXISTS subscriptions_user_id_fkey;
+ALTER TABLE subscriptions
+ADD CONSTRAINT subscriptions_user_id_fkey FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE SET NULL;
+
+ALTER TABLE purchases
+DROP CONSTRAINT IF EXISTS purchases_user_id_fkey;
+ALTER TABLE purchases
+ADD CONSTRAINT purchases_user_id_fkey FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE SET NULL;
+
+ALTER TABLE user_credits
+DROP CONSTRAINT IF EXISTS user_credits_user_id_fkey;
+ALTER TABLE user_credits
+ADD CONSTRAINT user_credits_user_id_fkey FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE;
+
+ALTER TABLE credit_transactions
+DROP CONSTRAINT IF EXISTS credit_transactions_user_id_fkey;
+ALTER TABLE credit_transactions
+ADD CONSTRAINT credit_transactions_user_id_fkey FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE SET NULL;
+
+ALTER TABLE account_deletion_requests
+DROP CONSTRAINT IF EXISTS account_deletion_requests_user_id_fkey;
+ALTER TABLE account_deletion_requests
+ADD CONSTRAINT account_deletion_requests_user_id_fkey FOREIGN KEY (user_id) REFERENCES auth.users(id) ON DELETE CASCADE;
+
+ALTER TABLE users
+DROP CONSTRAINT IF EXISTS users_id_fkey;
+ALTER TABLE users
+ADD CONSTRAINT users_id_fkey FOREIGN KEY (id) REFERENCES auth.users(id) ON DELETE CASCADE;