* feat(balance): incremental ForwardCalculator — only recalculate from changed date forward
When a Sync record carries a window_start_date, ForwardCalculator now
seeds its starting balances from the persisted DB balance for
window_start_date - 1, then iterates only from window_start_date to
calc_end_date. This avoids recomputing every daily balance on a
long-lived account when a single transaction changes.
Key changes:
- Account::Syncer passes sync.window_start_date to Balance::Materializer
- Balance::Materializer accepts window_start_date and forwards it to
ForwardCalculator; purge_stale_balances uses opening_anchor_date as the
lower bound in incremental mode so pre-window balances are not deleted
- Balance::ForwardCalculator accepts window_start_date; resolve_starting_balances
loads end_cash_balance/end_non_cash_balance from the prior DB record and
falls back to full recalculation when no prior record exists
- Tests added for incremental correctness, fallback behaviour, and purge safety
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
# Conflicts:
# app/models/balance/materializer.rb
* Enhance fallback logic on ForwardCalculator and Materializer
* fix(balance): address CodeRabbit review issues on incremental ForwardCalculator
- materializer.rb: handle empty sorted_balances in incremental mode by still
purging stale tail balances beyond window_start_date - 1, preventing orphaned
future rows when a transaction is deleted and the recalc window produces no rows
- materializer_test.rb: stub incremental? alongside calculate in the incremental
sync test so the guard in ForwardCalculator#incremental? doesn't raise when
@fell_back is nil (never set because calculate was stubbed out)
- materializer_test.rb: correct window_start_date in the fallback test from
3.days.ago to 2.days.ago so window_start_date - 1 hits a date with no
persisted balance, correctly triggering full recalculation instead of
accidentally seeding from the stale wrong_pre_window balance
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* feat(balance): multi-currency fallback to full recalculation and add corresponding tests
* address coderabbit comment about test
* Make the foreign-currency precondition explicit in the test setup.
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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