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Migrate all 29 money columns from float to NUMERIC/Decimal (BE-02)

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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>
This commit is contained in:
Carlos Escalante
2026-06-10 13:38:28 -06:00
parent 881d879ed1
commit 74886fbf98
7 changed files with 414 additions and 72 deletions
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3
backend/app/services/exchange_rate.py
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@@ -255,7 +255,8 @@ def get_crc_multipliers(session: Session) -> dict[str, float]:
usd_rate = get_current_rate(session)
if usd_rate:
multipliers["USD"] = usd_rate.sell_rate
# sell_rate is Decimal when loaded from the DB; keep multipliers float
multipliers["USD"] = float(usd_rate.sell_rate)
for code in (c.value for c in Currency):
if code in multipliers: