Cross-cutting Étape 2 coverage proving the per-security detail feature does not
regress aggregations, returns, date-move, or deletion.
Rust (lib.rs, +3 real-SQLite tests):
- regression_detailed_account_totals_equal_simple_account_totals: a detailed
account whose holdings sum to V yields byte-identical date/category/vehicle
SUM() totals to a simple account worth V (frozen golden numbers 1300/300/...).
Proven where SUM() GROUP BY actually runs, unlike the TS mock harness.
- migration_v14_to_v16_on_populated_db_preserves_integrity_and_totals: realistic
multi-type DB (simple + convertible priced w/ 2-snapshot history + non-
convertible priced) — totals byte-identical before/after v16, values
preserved, qty/price NULLed only on converted lines, one shared security,
non-convertible line fully intact.
- regression_snapshot_delete_cascades_to_holdings: two-hop CASCADE
(snapshot -> line -> holdings); security survives (RESTRICT).
TS (balance-flow.test.ts, +6 integration tests):
- detailed snapshot save end-to-end (aggregated line + securities + holdings in
one BEGIN/COMMIT); aggregated line value = rounded-cent SUM(holdings).
- rollback on injected holding INSERT failure (no partial line/holdings).
- snapshot date-move with a detailed account: line + holdings move together;
collision rolls both back (#200).
- golden-value invariant: detailed line stores the same value a simple account
would, feeding getSnapshotTotalsByDate identically.
- deleteSnapshot emits exactly one parent DELETE (FK cascades the rest).
No production code changed — pure test PR. Builds on the v16 tests (#211) and
the detailed-save/securities unit tests (#212) without duplicating them.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
