feat: 持续规划 — 滚动预算+自动延展+对比线+偏差告警

backend/app/models/__init__.py

@@ -382,6 +382,32 @@ class CashForecast(Base):
     created_at = Column(DateTime, server_default=func.now())
 
 
+class SystemConfig(Base):
+    """系统配置 — key-value存储"""
+    __tablename__ = "system_configs"
+    id = Column(Integer, primary_key=True, index=True)
+    config_key = Column(String(100), unique=True, nullable=False, comment="配置键")
+    config_value = Column(String(500), nullable=True, comment="配置值")
+    description = Column(String(500), nullable=True, comment="配置说明")
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())
+
+
+class BudgetDeviationAlert(Base):
+    """预算偏差预警记录"""
+    __tablename__ = "budget_deviation_alerts"
+    id = Column(Integer, primary_key=True, index=True)
+    kpi_id = Column(Integer, ForeignKey("kpi_definitions.id"), nullable=False, comment="关联KPI")
+    period = Column(String(20), nullable=False, comment="期间 YYYY-MM")
+    budget_value = Column(Float, nullable=True, comment="预算值")
+    actual_value = Column(Float, nullable=True, comment="实际值")
+    deviation_rate = Column(Float, nullable=True, comment="偏差率 %")
+    deviation_value = Column(Float, nullable=True, comment="偏差绝对值")
+    alert_level = Column(String(20), default="warning", comment="warning/critical")
+    status = Column(String(20), default="open", comment="open/resolved/ignored")
+    suggestion = Column(String(500), nullable=True, comment="处理建议")
+    created_at = Column(DateTime, server_default=func.now())
+
+
 class ForecastAccuracy(Base):
     """预测准确率 — 上期预测 vs 本期实际"""
     __tablename__ = "forecast_accuracy"