Update supabase-admin.ts createorretrievecustomer

[kschmelter13]

Not sure if this is helpful, but i used it in my personal project to validate existing customers so it wont create duplicates, after an account is deleted

[vercel]

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[chriscarrollsmith]

Interesting, thanks. So just to be clear, you encountered a scenario where the customer had been deleted from Supabase but not from Stripe, and this was resulting in a duplicate customer record being created in Stripe. To prevent this, you added a check for a matching record in Stripe before creating a new Stripe customer. Correct?

[chriscarrollsmith]

It looks like your code fails if the customer already exists in both supabase and stripe, because it finds a stripe record and then tries to upsert a duplicate record to supabase without checking if a supabase record exists first, which causes a primary key conflict.

I opened a new PR here: #274

[leerob]

#278