Balance sheet totals and accountable type summaries used a SQL JOIN on
exchange_rates matching only today's date, which returned NULL (defaulting
to 1:1) when no rate existed for that exact date. This caused foreign
currency accounts to show incorrect totals.
Changes:
- Refactor BalanceSheet::AccountTotals to batch-fetch exchange rates via
ExchangeRate.rates_for, with provider fallback, instead of a SQL join
- Refactor Accountable.balance_money to use the same batch approach
- Add ExchangeRate.rates_for helper for deduplicated rate lookups
- Fix net worth chart query to fall back to the nearest future rate when
no historical rate exists for a given date
- Add composite index on accounts (family_id, status, accountable_type)
- Reuse nearest cached exchange rate within a 5-day lookback window
before calling the provider, preventing redundant API calls on
weekends and holidays when providers return prior-day rates
https://claude.ai/code/session_01GyssBJxQqdWnuYofQRjUu8
Co-authored-by: Claude <noreply@anthropic.com>
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