convert created/started times to arrays to keep track of proofreader time

[dxenes1]

[dxenes1]

Currently for tasks we keep track of

• when a task is created, attribute created
• when a task is opened, attribute opened
• when a task if closed, attribute closed

However, if a proofreader starts a task and steps away, there is no way for us in the backend to store the information of what time was actually spent proofreading versus paused, afk, etc.

Theres a couple of ways to get around this, for now one idea is to have a duration attribute added Task schema that is a strictly positive counter of how many seconds a proofreader has spent on a task.

This is how it would work:

1. Task is created. duration is set to 0 by default.
2. Task is opened. open time is recorded (this is already built). In the frontend django app, we use a cookie to keep track of the user session. Here we have multiple cases:

Case 1: task is completed in one sitting:
the frontend sends a PATCH request to the completed task ID that adds the current duration with the session cookie time delta. duration = duration + session.time. The task is marked as closed. No additions to duration can happen after a task is closed.

Case 2. task is not complete (user pauses or exits)
the frontend sends a PATCH request to the unfinished task ID that adds the current duration with the session cookie time delta. duration = duration + session.time. Since the task is open still, more additions to duration can happen.

Capability to build out:

• add duration attribute, Number type, default to 0.
• add a patch function for duration in the url tasks/{task_id}/duration/ that adds the request response to the current duration and updates it in the MongoDB doc