New issue

[suleimanjem-hash]

Summary

This PR improves the reliability, resilience, and usability of the backend by implementing several fixes and enhancements across database transactions, request timeout handling, payout history synchronization, and paginated project listings.

Changes

• Implemented payout history backfill to replay historical payment_sent events from the Soroban event log into the database with duplicate protection.
• Updated request timeout handling to propagate timeouts as HTTP 504 Gateway Timeout responses instead of generic 500 errors.
• Enhanced the GET /splits endpoint to return pagination metadata, including total, start, limit, and hasMore, enabling clients to determine the total number of projects and available pages.
• Added automatic retry logic to withTransaction() for PostgreSQL serialization failures (40001) and deadlocks (40P01) using exponential backoff and retry logging.

Validation

• Added/updated tests covering:

  • Payout history backfill.
  • Timeout middleware returning HTTP 504.
  • Pagination metadata (total and hasMore) for GET /splits.
  • Transaction retries for deadlock and serialization failures.

Closes #641
Closes #642
Closes #643
Closes #644

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