Data backup hook

[kikuomax]

How about to add a hook function to the arguments of the requestIntradayTimeSeries function? A hook function might look like,

async function hookFunction(userId, request, payload): void

where

• userId: the Fitbit user ID
• request: the request parameters
• payload: the results of the request

It should not block so that requestIntradayTimeSeries can immediately return the results.

[kikuomax]

We might simplify the arguments as shown below,

async function hookFunction(request, payload): void

Because request.auth.credentials.userId will contain a user ID. See #2.

[kikuomax]

oops!