Improve Activity History

[dostuffthatmatters]

Right now, the logic of rendering the activity history is quite complicated and error-prone. Instead of logging the times of starting/stopping certain events (errors, etc.), we should log a datapoint about the current state every minute. I am doing this now, because I heavily simplified the frontend code for 4.1.0 anyways.

# old
class ActivityDatapoint(pydantic.BaseModel):
    """A datapoint of the activity history."""

    local_time: str
    event_label: Literal[
        "start-measurements",
        "stop-measurements",
        "error-occured",
        "errors-resolved",
        "start-core",
        "stop-core",
    ]

# new
class ActivityDatapoint(pydantic.BaseModel):
    """A datapoint of the activity history."""

    local_time: str
    is_measuring: bool = False
    has_errors: bool = False
    is_uploading: bool = False
    camtracker_startups: int = 0
    opus_startups: int = 0
    cli_calls: int = 0

Math when storing one of these datapoints per minute:

• Filesize per day is 216KB = 150 characters per record * 1440 records per day
• Filesize per year is 78MB which is fine
• If we write out the files every 5 minutes, we write about 31MB per day

Writing the data every 5 minutes is enough because on a 24 hour plot, we are barely able to see anything more recent than 5 minutes ago. Nevertheless, we still plot a cell for every minute.

Notice that we have no field core_is_running because that is implied when records are present. Also, we have the new fields is_uploading, camtracker_startups, opus_startups and cli_calls :)