Delete observation functionality

Summary

We want to give users the ability to delete any observation they wish

Acceptance Criteria

• Add ability to swipe right on a WeeklyTracker for a specific observation
• on right-swipe, implement a Dialog asking if the user is sure they want to delete, and then a redux thunk to delete that observation (using Gaia deleteFile())
• update UI to reflect that deleted observation

Motivation

Both to give users a sense of ownership over their data (since they do own it) and… for way down the line… to comply with GDPR guidelines that users should always be able to delete their data upon request.

Describe alternatives you’ve considered

None, this is necessary

[fallon7284]

Yeah the date would always be unique. It is sort of a large change that goes well outside the scope of this issue.

I wonder if the sort of hacky solution of just replace it with a null value is ultimately still perfectly acceptable? It would just require a small tweak in the fetch thunk to filter out those null values from the list we add to the redux store.

Otherwise like I said it’s a much larger change. @SomeMoosery Thoughts? I just changed this 2 days ago but honestly hadn’t considered that we would want to delete observations or I would have just done what i proposed above in the first place.

[fallon7284]

Maybe a better long term solution is actually that observations.json is an object where keys are the date and the name of the single backup file is also just like observations/{theDate}.json.

So a user deleting an observation where date: 1586646434498 would just be fetch observations.json, delete observations[“1586646434498”] and repost it, and then deleteFIle observations/1586646434498.json