M8-T05: bind electricity costs to source bindings

tests/test_api_energy.py

@@ -430,9 +430,7 @@ def test_prices_tibber_limit_caps_results(energy_client):
 
     start = (datetime.now(UTC) - timedelta(hours=3)).isoformat()
     end = (datetime.now(UTC) + timedelta(hours=2)).isoformat()
-    resp = client.get(
-        "/api/energy/prices", params={"start": start, "end": end, "limit": 2}
-    )
+    resp = client.get("/api/energy/prices", params={"start": start, "end": end, "limit": 2})
     assert resp.status_code == 200
     body = resp.json()
     assert len(body["points"]) <= 2
@@ -508,9 +506,16 @@ def test_costs_schema_fields_present(energy_client):
     item = resp.json()["items"][0]
     for field in (
         "period_start",
-        "d1_kwh", "d2_kwh", "r1_kwh", "r2_kwh",
-        "import_cost", "export_revenue", "net_cost",
-        "currency", "degraded",
+        "d1_kwh",
+        "d2_kwh",
+        "r1_kwh",
+        "r2_kwh",
+        "import_cost",
+        "export_revenue",
+        "net_cost",
+        "currency",
+        "degraded",
+        "source_binding_id",
     ):
         assert field in item, f"Missing field: {field}"
 
@@ -556,9 +561,7 @@ def test_summary_returns_correct_structure(energy_client):
 
     start = (datetime.now(UTC) - timedelta(hours=3)).isoformat()
     end = datetime.now(UTC).isoformat()
-    resp = client.get(
-        "/api/energy/costs/summary", params={"start": start, "end": end}
-    )
+    resp = client.get("/api/energy/costs/summary", params={"start": start, "end": end})
     assert resp.status_code == 200
     body = resp.json()
     for field in (
@@ -903,5 +906,3 @@ def test_tibber_test_token_not_in_response(energy_client):
 
     assert resp.status_code == 200
     assert secret_token not in resp.text
-
-