Adds the SQL foundation for the Bilan (balance sheet) feature:
- 5 new tables: balance_categories, balance_accounts, balance_snapshots,
balance_snapshot_lines, balance_account_transfers
- 7 indexes (category, active partial, snapshot, accounts x2, transaction,
snapshot_date)
- Seed of 7 standard categories (5 simple + 2 priced) marked is_seed=1
- CHECK(currency = 'CAD') on balance_accounts (MVP — v2 lifts the constraint
with a multi-currency rate table)
- CHECK kind invariants on balance_snapshot_lines (quantity/unit_price both
NULL OR both NOT NULL)
- FK transaction_id ON DELETE RESTRICT to preserve reproducibility of
Modified Dietz returns calculated on past periods
Migration v9 is added inline to the lib.rs Vec<Migration> via a new
constant database::BALANCE_SCHEMA backed by balance_schema.sql. The
schema is mirrored in consolidated_schema.sql so brand-new profiles
get the feature preinstalled without replaying v9.
13 new co-located rusqlite tests validate the migration on a fresh
in-memory DB: schema applies cleanly, 7 categories seeded with correct
kinds, CHECK rejects invalid currency/kind/direction, UNIQUE rejects
duplicate snapshot_date / (snapshot_id,account_id) / (transaction_id,
account_id), FK CASCADE on snapshot delete, FK RESTRICT on transaction
delete and on category with linked accounts, seed idempotent on replay.
Refs #138
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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