Update app.py

app.py

@@ -70,10 +70,12 @@ def load_models():
 # ---------- Эндпоинты ----------
 
 
+from datetime import datetime  # вверху файла, если ещё не импортирован
+
 @app.post("/forecast", response_model=ForecastResponse)
 def forecast(req: ForecastRequest):
     if not req.transactions:
-        raise HTTPException(400, "transactions is empty")
+        raise HTTPException(status_code=400, detail="transactions is empty")
 
     df = pd.DataFrame([t.dict() for t in req.transactions])
 
@@ -86,8 +88,14 @@ def forecast(req: ForecastRequest):
     inc_fc = fit_and_forecast(inc, steps, freq, method=method)
     exp_fc = fit_and_forecast(exp, steps, freq, method=method)
 
+    # Преобразуем индексы в RFC3339: "YYYY-MM-DDT00:00:00Z"
+    period_end = [
+        d.strftime("%Y-%m-%dT%H:%M:%SZ")
+        for d in inc_fc.index.to_pydatetime().tolist()
+    ]
+
     return ForecastResponse(
-        period_end=[d.strftime("%Y-%m-%d") for d in inc_fc.index.to_pydatetime().tolist()],
+        period_end=period_end,
         income_forecast=[float(x) for x in inc_fc.values.tolist()],
         expense_forecast=[float(x) for x in exp_fc.values.tolist()],
     )