98 lines
2.6 KiB
Python
98 lines
2.6 KiB
Python
"""利润模拟模型
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管理利润模拟测算记录
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"""
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from typing import Optional, List, TYPE_CHECKING
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from decimal import Decimal
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from sqlalchemy import BigInteger, String, Integer, ForeignKey, DECIMAL
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from app.models.base import BaseModel
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if TYPE_CHECKING:
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from app.models.pricing_plan import PricingPlan
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from app.models.user import User
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from app.models.sensitivity_analysis import SensitivityAnalysis
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class ProfitSimulation(BaseModel):
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"""利润模拟表"""
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__tablename__ = "profit_simulations"
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pricing_plan_id: Mapped[int] = mapped_column(
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BigInteger,
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ForeignKey("pricing_plans.id"),
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nullable=False,
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index=True,
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comment="定价方案ID"
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)
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simulation_name: Mapped[str] = mapped_column(
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String(100),
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nullable=False,
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comment="模拟名称"
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)
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price: Mapped[Decimal] = mapped_column(
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DECIMAL(12, 2),
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nullable=False,
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comment="模拟价格"
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)
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estimated_volume: Mapped[int] = mapped_column(
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Integer,
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nullable=False,
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comment="预估客量"
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)
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period_type: Mapped[str] = mapped_column(
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String(20),
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nullable=False,
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comment="周期类型：daily-日, weekly-周, monthly-月"
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)
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estimated_revenue: Mapped[Decimal] = mapped_column(
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DECIMAL(14, 2),
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nullable=False,
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comment="预估收入"
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)
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estimated_cost: Mapped[Decimal] = mapped_column(
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DECIMAL(14, 2),
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nullable=False,
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comment="预估成本"
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)
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estimated_profit: Mapped[Decimal] = mapped_column(
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DECIMAL(14, 2),
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nullable=False,
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comment="预估利润"
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)
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profit_margin: Mapped[Decimal] = mapped_column(
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DECIMAL(5, 2),
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nullable=False,
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comment="利润率(%)"
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)
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breakeven_volume: Mapped[int] = mapped_column(
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Integer,
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nullable=False,
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comment="盈亏平衡客量"
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)
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created_by: Mapped[Optional[int]] = mapped_column(
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BigInteger,
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ForeignKey("users.id"),
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nullable=True,
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comment="创建人ID"
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)
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# 关系
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pricing_plan: Mapped["PricingPlan"] = relationship(
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"PricingPlan",
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back_populates="profit_simulations"
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)
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creator: Mapped[Optional["User"]] = relationship(
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"User",
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back_populates="created_profit_simulations"
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)
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sensitivity_analyses: Mapped[List["SensitivityAnalysis"]] = relationship(
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"SensitivityAnalysis",
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back_populates="simulation",
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cascade="all, delete-orphan"
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)
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