Limit server data by date

You can tell the server to only show data from some date on or for the last X days. So if you want to have only last 90 days of data, you need to modify ManicTimeServerSettings.json file, so that it includes:

{
    ....
    "activityReport": {
        "maxAge": 90
    }
    ....
}

You can also set it to keep the data from some date on, so for example if you want to have the data from 1/1/2021, you would modify ManicTimeServerSettings.json like this:

{
    ....
    "activityReport": {
        "minDate": "2021-01-01"
    }
    ....
}

You could use both settings:

{
    ....
    "activityReport": {
        "minDate": "2021-01-01",
        "maxAge": 90
    }
    ....
}

In this case the most restrictive would win.