score:0

in your api call for february, you are getting all data points from 31. january 2019 to 28 february 2020. you have to change the range here to 31. january 2020 (or 1. february 2020). also: 2020 is a leap year, so the last day of february is the 29th,

// february
router.get("/february", async (req, res) => {
...
        [op.between]: [ "2020-01-31 19:30:00.000 +00:00", "2020-02-29 19:30:00.000 +00:00"]}}});
...
});

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