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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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6
backend/app/services/savings_accrual.py
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@@ -1,3 +1,5 @@
from decimal import Decimal
from sqlmodel import Session, select
from app.models.models import (
@@ -8,8 +10,8 @@ from app.models.models import (
Transaction,
)
MEMP_MONTHLY = 200000.0
MPAT_MONTHLY = 200000.0
MEMP_MONTHLY = Decimal("200000")
MPAT_MONTHLY = Decimal("200000")
def _get_savings_account(session: Session, bank: Bank) -> Account | None: