Nestera/commit_message.txt at main · Devsol-01/Nestera · GitHub

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feat(backend): add transaction enrichment structuring with amount formatting and explorer links

## Summary

Implemented transaction response enrichment interceptor that formats raw database amounts into user-friendly displays and adds Stellar Expert exploration links.

## Changes

- **New Interceptor**: `TransactionFormattingInterceptor` in `common/interceptors/`
  - Formats amounts: `"100000000"` → `"$100.00"` with proper USDC precision (7 decimals)
  - Generates Stellar Expert links from transaction hashes
  - Configurable asset mapping system

- **Module Updates**:
  - `transactions.module.ts`: Added global interceptor provider
  - `transaction-response.dto.ts`: Added `amountFormatted` and `explorerLinks` fields
  - `transactions.service.ts`: Added asset ID extraction logic

## Acceptance Criteria ✅

- ✅ Construct explicit formatter logic attaching asset mapping symbols
- ✅ Evaluate Stellar contract precision parameters intelligently
- ✅ Render UI outputs exactly (e.g., `amountFormatted.display: "$500.00"`)
- ✅ Dynamically attach canonical Stellar Expert exploration links

## Files Changed

- `backend/src/common/interceptors/transaction-formatting.interceptor.ts` (new)
- `backend/src/modules/transactions/transactions.module.ts`
- `backend/src/modules/transactions/dto/transaction-response.dto.ts`
- `backend/src/modules/transactions/transactions.service.ts`
- `backend/src/common/interceptors/TRANSACTION_FORMATTING_README.md` (new)

## Testing

- ✅ `npm run build` passes
- ✅ TypeScript compilation successful
- ✅ Interceptor integration verified