feat: Implement currency management with models, routes, and UI updates; add backfill script for existing records

tests/unit/test_currency_workflow.py

@@ -0,0 +1,54 @@
+from tests.unit.conftest import client
+
+
+def test_create_capex_with_currency_code_and_list():
+    # create scenario first (reuse helper from other tests)
+    from tests.unit.test_costs import _create_scenario
+
+    sid = _create_scenario()
+
+    # create with currency_code
+    payload = {
+        "scenario_id": sid,
+        "amount": 500.0,
+        "description": "Capex with GBP",
+        "currency_code": "GBP",
+    }
+    resp = client.post("/api/costs/capex", json=payload)
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["currency_code"] == "GBP" or data.get(
+        "currency", {}).get("code") == "GBP"
+
+
+def test_create_opex_with_currency_id():
+    from tests.unit.test_costs import _create_scenario
+    from routes.currencies import list_currencies
+
+    sid = _create_scenario()
+
+    # fetch currencies to get an id
+    resp = client.get("/api/currencies/")
+    assert resp.status_code == 200
+    currencies = resp.json()
+    assert len(currencies) > 0
+    cid = currencies[0]["id"]
+
+    payload = {
+        "scenario_id": sid,
+        "amount": 120.0,
+        "description": "Opex with explicit id",
+        "currency_id": cid,
+    }
+    resp = client.post("/api/costs/opex", json=payload)
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["currency_id"] == cid
+
+
+def test_list_currencies_endpoint():
+    resp = client.get("/api/currencies/")
+    assert resp.status_code == 200
+    data = resp.json()
+    assert isinstance(data, list)
+    assert all("id" in c and "code" in c for c in data)

tests/unit/test_production.py

@@ -21,7 +21,7 @@ def _create_scenario(client: TestClient) -> int:
 
 def test_create_production_record(client: TestClient) -> None:
     scenario_id = _create_scenario(client)
-    payload = {
+    payload: dict[str, any] = {
         "scenario_id": scenario_id,
         "amount": 475.25,
         "description": "Daily output",