Update: Stripe integration complete

Yesterday I mentioned I was working on implementing repositories, services and routes for Stripe integration.

Today it's done:

- CreditService implemented with FIFO logic (consumes credits that expire soonest first)

- Idempotency built in (users don't pay twice for the same resource)

- Balance validation for list endpoints (must have credits > 0 to access)

- Detail endpoints consume credits (1 credit per signal/cluster/hypothesis detail)

- Transaction history endpoint for transparency

- Balance endpoint for real-time UI updates

Key architecture decisions:

- Atomic transactions (all or nothing)

- FIFO by expires_at (validated in PoC, now in production code)

- Idempotency via resource_type + resource_id tracking

- Configurable credit costs (easy to adjust pricing strategy)

Next: Integrating credit consumption into the frontend endpoints and preparing for beta testing. 12 days to launch.