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/alembic/versions/005_quota_tables.py

@@ -0,0 +1,53 @@
+"""Add quota tables
+
+Revision ID: 005_quota
+Revises: 004_charging
+Create Date: 2026-04-03
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "005_quota"
+down_revision = "004_charging"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # --- energy_quotas ---
+    op.create_table(
+        "energy_quotas",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("name", sa.String(200), nullable=False),
+        sa.Column("target_type", sa.String(50), nullable=False),
+        sa.Column("target_id", sa.Integer, nullable=False),
+        sa.Column("energy_type", sa.String(50), nullable=False),
+        sa.Column("period", sa.String(20), nullable=False),
+        sa.Column("quota_value", sa.Float, nullable=False),
+        sa.Column("unit", sa.String(20), default="kWh"),
+        sa.Column("warning_threshold_pct", sa.Float, default=80),
+        sa.Column("alert_threshold_pct", sa.Float, default=95),
+        sa.Column("is_active", sa.Boolean, default=True),
+        sa.Column("created_by", sa.Integer, sa.ForeignKey("users.id")),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+    )
+
+    # --- quota_usage ---
+    op.create_table(
+        "quota_usage",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("quota_id", sa.Integer, sa.ForeignKey("energy_quotas.id"), nullable=False),
+        sa.Column("period_start", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("period_end", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("actual_value", sa.Float, default=0),
+        sa.Column("quota_value", sa.Float, nullable=False),
+        sa.Column("usage_rate_pct", sa.Float, default=0),
+        sa.Column("status", sa.String(20), default="normal"),
+        sa.Column("calculated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("quota_usage")
+    op.drop_table("energy_quotas")