import pandas as pd

orders = pd.DataFrame(
    {
        "date": pd.to_datetime(
            [
                "2026-01-01",
                "2026-01-02",
                "2026-01-03",
                "2026-01-04",
                "2026-01-05",
                "2026-01-06",
            ]
        ),
        "sales_usd": [420.0, 510.0, 460.0, 590.0, 640.0, 610.0],
    }
)
orders = orders.sort_values("date").set_index("date")