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Description
This PR introduces durable persistence for x402 receipts and Server-Sent Events (SSE) by leveraging Vercel Postgres for relational data and Vercel KV for fast key-value lookups.
Motivation
Reliability: Ensure receipts and SSE events are not lost in transient memory.
Replayability: Enable event replay and auditing by storing events durably.
Scalability: Use Postgres for structured queries and KV for lightweight caching.
Consistency: Provide a single source of truth for receipts and event streams.
Changes
Added vercel/postgres integration for storing x402 receipts.
Added vercel/kv integration for SSE event persistence.
Updated controllers to write receipts and events to the durable store.
Implemented retrieval endpoints for receipts and SSE event replay.
Adjusted tests to validate persistence and retrieval logic.
Closed #147