## What
Hardens `CurrencyConversionService` against a slow/unreachable external
FX-rate CDN, which was crashing `/api/cashflow/trend`.
## Sentry
- Fixes PHP-LARAVEL-2X — `RuntimeException: Failed to fetch currency
rates ... cURL error 28: Operation timed out`
- Fixes PHP-LARAVEL-31 — `FatalError: Maximum execution time of 30
seconds exceeded` (Guzzle CurlFactory)
## Root cause
For a historical date the service walked up to 8 lookback dates × 2 URLs
at a **10s timeout each** (~160s worst case → 30s PHP fatal), and a
single network timeout threw a `RuntimeException` that 500'd the whole
request.
## Changes
- **Bounded timeouts**: 3s connect / 5s total per request.
- **Abort on unreachable source**: a connection/timeout error stops the
date walk (after trying the fallback host) instead of repeating the same
timeout for every candidate date. 404s still walk back to earlier
releases.
- **Graceful degradation**: failures return an empty rate map instead of
throwing — conversions already fall back to `0.0` on missing rates, so
the trend endpoint no longer 500s.
- **Persistent cache**: historical releases cached 30d (immutable),
`latest` 6h, unavailable results 10m (dampens retries during an outage).
## Tests
- Updated the former "throws" test to assert graceful degradation to
`0.0`.
- Added: timeout aborts the date walk after 2 attempts; rates cache
across service instances.
- All 12 tests pass.
## Problem
`PHP-LARAVEL-2M` (High, escalating, 38 events) — `RuntimeException:
Failed to fetch currency rates for xxx on 2025-12-31: HTTP 404` crashing
`/dashboard`.
A user holds an account in currency `xxx` (ISO 4217 "no/unknown
currency"). No rate file exists for it, so every candidate URL returns
404. `CurrencyConversionService::fetchRates` threw an unhandled
`RuntimeException` that bubbled past the graceful-degradation logic in
`ExchangeRateService::convert` and broke the whole dashboard render.
## Fix
Distinguish **permanent** 404s from **transient** failures:
- All sources return 404 → log a warning and return `[]`. Callers
already handle empty rates (return unconverted / zero amount).
- Timeouts / 5xx / connection errors → still throw, so real outages stay
visible.
## Tests
- New: unknown base currency with all-404 sources returns `0.0` instead
of throwing.
- Existing "throws when both primary and fallback fail" (500s) still
passes — transient errors still surface.
Fixes PHP-LARAVEL-2M.
## Why
### Problem
Users with accounts in multiple currencies see raw balances on the net
worth chart without any conversion. A user with a USD-denominated
profile who also holds EUR and GBP accounts sees misleading totals — the
chart simply sums cents across currencies as if they were the same unit.
## What
### Changes
- **`ExchangeRateService`** — New service that wraps
`CurrencyConversionService` with DB-level caching. Checks the
`exchange_rates` table first, falls back to the external CDN API on
cache miss, and stores the full rate blob for future lookups.
- **`exchange_rates` migration + model** — New table with
`(base_currency, date)` unique constraint storing JSON rate blobs.
Includes factory.
- **`CurrencyConversionService`** — Made `getRatesForCurrency()` public
so `ExchangeRateService` can delegate to it.
- **`DashboardAnalyticsController`** — `netWorthEvolution` and
`netWorthDailyEvolution` endpoints now convert every account balance
from `account.currency_code` to `user.currency_code`. Response includes
`currency_code` field and `_original` data for foreign-currency
accounts.
- **Future date capping** — `ExchangeRateService::getRates()` caps any
future date to today, since the currency API only serves historical
rates. Prevents 500 errors when the chart requests end-of-month rates
for the current (incomplete) month.
- **Frontend charts** — Simplified to single-currency display. Removed
multi-currency `TotalDisplay` component; the chart header and tooltip
now show amounts in the user's currency. Foreign-currency accounts show
their original amount inline in the tooltip (e.g., "€2,000.00 →
$2,222.22").
- **`valueFormatter` type fix** — Changed return type from `string` to
`React.ReactNode` in chart component interfaces to match actual usage
with `AmountDisplay`.
## Screenshot
<img width="1266" height="649" alt="image"
src="https://github.com/user-attachments/assets/6f661840-3f65-49fe-9948-d4cfd6c6ef0e"
/>
## Summary
- Adds Binance as a third banking provider alongside EnableBanking and
Indexa Capital
- Binance appears in the institution list for **all countries**, with
the full list sorted alphabetically
- Creates a single "Crypto Portfolio" investment account with total
portfolio value converted to the user's preferred currency
- Supports direct fiat pairs (e.g. BTCEUR), USD stablecoin 1:1 mapping,
and USDT fallback conversion
## Changes
- **Migration**: adds encrypted `api_secret` column to
`banking_connections`
- **BinanceClient**: HMAC-SHA256 authenticated API client for account
data and ticker prices
- **BinanceBalanceSyncService**: converts all non-zero balances to fiat
via direct pairs or USDT fallback
- **BinanceController + ConnectBinanceRequest**: validates credentials,
creates connection and single account
- **SyncBankingConnectionJob**: new `syncBinance()` branch
- **AccountMappingController**: Binance uses Investment account type
- **Frontend**: Binance institution for all countries, API Key + Secret
form fields, alphabetically sorted list
- **Factory**: `binance()` state on `BankingConnectionFactory`
## Test plan
- [x] `BinanceControllerTest` — 6 tests (valid connection, invalid
credentials, account-mapping flag, feature flag, validation, user
currency)
- [x] `BinanceBalanceSyncTest` — 7 tests (direct EUR pair, USDT
fallback, USD stablecoins, locked balances, same-date update, empty
balances, missing external ID)
- [x] Full test suite passes (545 tests)
- [x] Manual: open connection dialog → select any country → Binance
appears alphabetically → select Binance → API Key + Secret form →
connect
Víctor Falcón