Entry addition & update flow

[dlo]

Per attached mockup, do the following when adding a new task:

1. Check if the task id is the last task id stored in a configuration file. If it is, skip to 2. If it isn't, skip to 3.
2. Retrieve the last entry id stored in the configuration file, and post an update to this entry, adding the appropriate number of hours to it. Skip to 4.
3. Create a new entry with the task id.
4. Update the configuration file.

Notes may be appended at any time to the last entry id.