ems-core v1.0.0: Standard EMS platform core

Shared backend + frontend for multi-customer EMS deployments.
- 12 enterprise modules: quota, cost, charging, maintenance, analysis, etc.
- 120+ API endpoints, 37 database tables
- Customer config mechanism (CUSTOMER env var + YAML config)
- Collectors: Modbus TCP, MQTT, HTTP API, Sungrow iSolarCloud
- Frontend: React 19 + Ant Design + ECharts + Three.js
- Infrastructure: Redis cache, rate limiting, aggregation engine

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/models/quota.py

@@ -0,0 +1,38 @@
+from sqlalchemy import Column, Integer, String, Float, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from app.core.database import Base
+
+
+class EnergyQuota(Base):
+    """能源配额管理"""
+    __tablename__ = "energy_quotas"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(200), nullable=False)
+    target_type = Column(String(50), nullable=False)  # building, department, device_group
+    target_id = Column(Integer, nullable=False)  # FK to device_groups.id
+    energy_type = Column(String(50), nullable=False)  # electricity, heat, water, gas
+    period = Column(String(20), nullable=False)  # monthly, yearly
+    quota_value = Column(Float, nullable=False)  # 目标消耗值
+    unit = Column(String(20), default="kWh")
+    warning_threshold_pct = Column(Float, default=80)  # 80%预警
+    alert_threshold_pct = Column(Float, default=95)  # 95%告警
+    is_active = Column(Boolean, default=True)
+    created_by = Column(Integer, ForeignKey("users.id"))
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+
+class QuotaUsage(Base):
+    """配额使用记录"""
+    __tablename__ = "quota_usage"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    quota_id = Column(Integer, ForeignKey("energy_quotas.id"), nullable=False)
+    period_start = Column(DateTime(timezone=True), nullable=False)
+    period_end = Column(DateTime(timezone=True), nullable=False)
+    actual_value = Column(Float, default=0)
+    quota_value = Column(Float, nullable=False)
+    usage_rate_pct = Column(Float, default=0)
+    status = Column(String(20), default="normal")  # normal, warning, exceeded
+    calculated_at = Column(DateTime(timezone=True), server_default=func.now())