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PR Description

This PR implements four major features/fixes for the StellarYield platform:

1. Gasless Transactions (Fee Bumping) - #32

Implemented a sponsor-led onboarding flow where the protocol pays for the first 3 transactions of a new user.

  • Backend: Created a secure /api/relayer/fee-bump endpoint with rate-limiting (3 requests per IP/15m) to sign FeeBumpTransactions.
  • Frontend: Updated the Soroban service to support wrapping transactions in a FeeBump wrapper before submission.
  • Closes #32

2. Horizon Event Indexer Service - #28

Built a background Node.js service to track on-chain vault actions in real-time.

  • Features: Idempotent processing using unique database constraints (PostgreSQL via Prisma), reorg handling by tracking the last processed ledger, and XDR parsing for event topics/data.
  • Location: /server/src/indexer/
  • Closes #28

3. Emergency Circuit Breaker & Timelock Governance - #27

Enhanced security with a programmable pause mechanism and admin timelocks.

  • Circuit Breaker: emergency_pause() and emergency_unpause() to immediately halt deposits and rebalancing.
  • Rescue Funds: rescue_funds() for emergency admin withdrawals.
  • Timelock: Implemented a 24-hour timelock for admin changes to prevent governance attacks.
  • Closes #27

4. Flash-Loan Resistant Price Oracle - #24

Integrated a secure price oracle with TWAP fallback to protect against price manipulation during share calculations.

  • Oracle Integration: Direct fetching from a Soroban-compatible oracle.
  • TWAP Fallback: Automated fallback to Time-Weighted Average Price if the oracle feed is stale or delayed.
  • Location: /contracts/yield_vault/src/oracle.rs
  • Closes #24

Tested with local Soroban simulations and unit tests in contracts/yield_vault/src/lib.rs.