Implement Outbox Pattern with consumer ACK to ensure 100% reliable event
delivery between blockchain-service and wallet-service:
blockchain-service:
- Add OutboxEvent model to Prisma schema with status tracking
- Create outbox repository interface and implementation
- Modify deposit-detection.service to write events to outbox
- Add outbox-publisher.service with cron jobs for publishing/retry
- Add deposit-ack-consumer.service to receive ACK from wallet-service
- Add publishRaw method to event-publisher.service
wallet-service:
- Modify deposit-confirmed.handler to send ACK after successful processing
- Add wallet.deposit.credited topic mapping for ACK events
Event flow:
1. Deposit detected → written to outbox (status: PENDING)
2. Outbox publisher sends to Kafka → status: SENT
3. wallet-service processes and sends ACK → status: ACKED
4. Events without ACK are retried with exponential backoff
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
## Address Derivation Changes
- Change KAVA from Cosmos bech32 (kava1...) to EVM format (0x...)
- KAVA now uses same EVM address as BSC for deposit monitoring
- Add KAVA to evmChains set for automatic monitoring registration
## Database Schema Updates (Migration: 20241208000000)
- MonitoredAddress: add address_type, account_sequence, system_account_type,
system_account_id, region_code columns
- DepositTransaction: add address_type, account_sequence, system_account_type,
system_account_id columns
- Make user_id nullable for system account support
- Create recovery_mnemonics table for account recovery
- Add indexes: idx_account_sequence, idx_type_active, idx_system_account_type,
idx_deposit_account, and recovery_mnemonics indexes
## New Features
- Withdrawal request handler and Kafka consumer
- Test USDT deployment scripts for KAVA and BSC
- Smart contracts for TestUSDT token
## Infrastructure Updates
- Update mappers for new schema fields
- Update application and infrastructure modules
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
hailin