Target Architecture

```mermaid flowchart TD
  subgraph Site["Customer Site / Microgrid"]
  MG["Microgrid"]
  GW1["Gateway A\nOpenEMS Edge"]
  GW2["Gateway B\nOpenEMS Edge"]
  DEV["Devices\nMeters / ESS / Inverters / BMS"]
  MG --> GW1
  MG --> GW2
  GW1 --> DEV
  GW2 --> DEV
  end

  subgraph OpenEMS["OpenEMS Platform"]
  OEB["OpenEMS Backend"]
  META["Metadata\nEdge + user identity\nauthorization + state"]
  OTD["Backend Timedata\nInfluxDB"]
  OUI["OpenEMS UI\nOps / engineering"]
  OEB --> META
  OEB --> OTD
  OUI --> OEB
  end

  subgraph NFE["NFE Product Platform"]
  API["NFE App Backend / API"]
  PG["Postgres\nCustomers / tenants / tariffs /\ninvoices / permissions"]
  JOBS["Usage + billing jobs"]
  DERIVED["Derived usage tables /\ncustomer summaries / billing outputs"]
  WEB["Customer Web App"]
  ADMIN["NFE Admin App"]
  WEB --> API
  ADMIN --> API
  API --> PG
  API --> DERIVED
  JOBS --> PG
  JOBS --> DERIVED
  end

  GW1 --> OEB
  GW2 --> OEB
  API --> OEB
  API --> OTD
  JOBS --> OTD
 ```