# consolidate-tbank-connection-resolution — Implementation Summary

## Semantic Verification

Date: 2026-08-25

Checked areas:

- HTTP routes and controllers: no diff in `backend/src/tbank/*controller.ts`.
- Response/request DTOs and Swagger decorators: no diff in `backend/src/tbank/*dto.ts`.
- OpenAPI/frontend contract: unchanged by code diff because controllers and DTOs did not change.
- Frontend behavior: unchanged; no frontend files were modified by this change.
- Supported account types: preserved in shared `tbank-account-policy` and verified by policy/access/accounts tests.
- Cache semantics: Portfolio `freshForMs`, `fallbackForMs`, `metadataForMs`; Account Ledger `freshForMs` and `maxCachedPages`; Upcoming Events `positionsBatchSize`, `dividendCacheTtlMs`, and `instrumentCacheTtlMs` remain unchanged.
- Token replacement/account access nuance: Account Ledger still executes `TbankAccessService.withAccount` before LRU page cache lookup, covered by the cached-page access regression test.
- T-Bank connection settings: candidate token validation, upsert/delete behavior, and Portfolio snapshot invalidation remain covered by focused tests.

Conclusion:

The implementation matches the approved Proposal and Design as a behavior-preserving backend refactor. No Delta Specs were required because no capability, route, DTO, status-code contract, frontend behavior, or durable storage behavior changed.