Initial commit: 智能项目定价模型

后端服务/app/models/fixed_cost.py

@@ -0,0 +1,49 @@
+"""固定成本模型
+
+管理月度固定成本（房租、水电等）及分摊方式
+"""
+
+from sqlalchemy import String, Boolean, DECIMAL
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.models.base import BaseModel
+
+
+class FixedCost(BaseModel):
+    """固定成本表"""
+    
+    __tablename__ = "fixed_costs"
+    
+    cost_name: Mapped[str] = mapped_column(
+        String(100),
+        nullable=False,
+        comment="成本名称"
+    )
+    cost_type: Mapped[str] = mapped_column(
+        String(20),
+        nullable=False,
+        comment="类型：rent-房租, utilities-水电, property-物业, other-其他"
+    )
+    monthly_amount: Mapped[float] = mapped_column(
+        DECIMAL(12, 2),
+        nullable=False,
+        comment="月度金额"
+    )
+    year_month: Mapped[str] = mapped_column(
+        String(7),
+        nullable=False,
+        index=True,
+        comment="年月：2026-01"
+    )
+    allocation_method: Mapped[str] = mapped_column(
+        String(20),
+        nullable=False,
+        default="count",
+        comment="分摊方式：count-按项目数, revenue-按营收, duration-按时长"
+    )
+    is_active: Mapped[bool] = mapped_column(
+        Boolean,
+        nullable=False,
+        default=True,
+        comment="是否启用"
+    )