Update the editable per-design system-loss settings.

---

The request body is a flat map of loss name to percentage. Only the losses you supply are updated; all others are left unchanged (partial update). Values are percentages between 0 and 100, accepted to one decimal place.

Updating system losses invalidates the design's performance simulation. This endpoint does not re-run the simulation — run it separately to recompute production. Until then, energy_production.up_to_date on the Design Summary will be false.

Locks

Some losses cannot be edited and a request to change them is rejected with 422:

• Financing lock — when a financing product is selected for the design, that product dictates every loss. The whole update is rejected. This is reflected on read as editable: false / locked_by_financier: "<code>", with every field locked: true and disabled_reason: "financier".
• Shading-engine lock — when the shading engine is enabled, the shading loss is computed automatically and cannot be set manually. A request including shading is rejected, and on read that field is locked: true with disabled_reason: "shading_engine_enabled".

Mapping to loss_summary stages

Each editable setting affects exactly one loss_summary output stage on the Design Summary:

The remaining loss_summary stages are engine-computed and have no editable input.

{
  "system_loss_settings": {
    "soiling": 2.5,
    "shading": 3,
    "mismatch": 2,
    "wiring": 2,
    "connections": 0.5,
    "light_induced_degradation": 1.5,
    "availability": 3
  }
}

{
  "system_loss_settings": {
    "editable": true,
    "values": {
      "soiling": {
        "value": 2
      },
      "snow": {
        "value": 2
      },
      "shading": {
        "value": 2
      },
      "mismatch": {
        "value": 2
      },
      "wiring": {
        "value": 2
      },
      "connections": {
        "value": 2
      },
      "light_induced_degradation": {
        "value": 2
      },
      "availability": {
        "value": 2
      },
      "rating": {
        "value": 2
      },
      "age": {
        "value": 2
      },
      "other": {
        "value": 2
      }
    }
  }
}