BAC zero-interest financing: an anchor purchase splits into N monthly
cuota transactions (truncate-to-0.10 rule, last cuota absorbs rounding;
one cuota per 18th-cut billing cycle on the 19th). Pinned against real
Financiamientos data.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
- FK rules via migration 7884505b16b3 (verified on dev with a rolled-
back probe): transactions/recurring items SET NULL on category delete
(this also fixes the 500 that DELETE /categories raised for in-use
categories), water readings CASCADE with their receipt. Models declare
ondelete to stay in sync. (ARCH-09, BE-11)
- compute_actuals_by_source: 3 grouped queries replace 10 single-
aggregate round-trips; behavior pinned by the existing cycle suite.
(BE-21)
- compute_cc_by_category prefetches category names (ARCH-15); agent
pension latest-per-fund resolved in SQL (BE-04); municipal water
consumption batched into one grouped query (BE-05).
- Deterministic pagination: date DESC, id DESC on all transaction
listings. (ARCH-12)
- New agent-tool tests (session binding, JSON-safe output, batched
queries): 64 tests green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Models use Money = Annotated[Decimal, PlainSerializer(float)] so storage
is exact NUMERIC(15,2) (rates 15,6) while JSON keeps emitting plain
numbers — the frontend contract is unchanged, pinned by
test_models_serialization.py. Service layers coerce to float at their
boundaries (projection math, rate multipliers, agent tool output, the
savings constants become Decimal) so no naive Decimal/float mixing can
raise. Migration 7f567c8bafdb applied to dev: per-row values and the
table sum byte-identical before/after; endpoints verified live on the
new schema. 59/59 tests green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The baseline (c3da001a0eb3) was autogenerated against an empty Postgres
and schema-diffed against the live dev schema until column-identical
(two model fixes fell out: deferred_to_next_cycle now declares its
server_default, usersettings.data is JSONB on Postgres to match the
live type). Startup replaces init_db/run_migrations with
run_alembic_upgrade(): pre-Alembic databases that already match the
baseline are adopted via stamp; fresh databases build from the
migration. The section is serialized with a pg advisory lock because
prod uvicorn runs 2 workers, each executing the lifespan. Verified:
adoption + idempotent re-run on the dev DB, fresh 13-table build on an
empty DB, full container boot, 55/55 tests. (ARCH-02, BE-19)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
