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74886fbf98
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>
65 lines
1.6 KiB
Python
65 lines
1.6 KiB
Python
from decimal import Decimal
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from sqlmodel import Session, select
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from app.models.models import (
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Account,
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AccountType,
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Bank,
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SavingsAccrual,
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Transaction,
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)
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MEMP_MONTHLY = Decimal("200000")
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MPAT_MONTHLY = Decimal("200000")
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def _get_savings_account(session: Session, bank: Bank) -> Account | None:
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return session.exec(
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select(Account).where(
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Account.account_type == AccountType.SAVINGS,
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Account.bank == bank,
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)
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).first()
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def maybe_apply_monthly_savings(session: Session, tx: Transaction) -> SavingsAccrual | None:
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"""Apply monthly savings contribution if this is the first salary of the month.
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Idempotent: if a SavingsAccrual row already exists for (year, month), do nothing.
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Bumps MEMP and MPAT savings account balances and records the accrual.
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"""
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year = tx.date.year
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month = tx.date.month
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existing = session.exec(
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select(SavingsAccrual).where(
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SavingsAccrual.year == year,
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SavingsAccrual.month == month,
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)
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).first()
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if existing:
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return None
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memp = _get_savings_account(session, Bank.MEMP)
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mpat = _get_savings_account(session, Bank.MPAT)
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if memp is None or mpat is None:
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return None
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memp.balance += MEMP_MONTHLY
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mpat.balance += MPAT_MONTHLY
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session.add(memp)
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session.add(mpat)
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accrual = SavingsAccrual(
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year=year,
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month=month,
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memp_amount=MEMP_MONTHLY,
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mpat_amount=MPAT_MONTHLY,
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trigger_transaction_id=tx.id,
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)
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session.add(accrual)
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session.commit()
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session.refresh(accrual)
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return accrual
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