Thank you for your contribution. @steemsql is not free anymore and thus we should be very careful in this as this potentially will make the API server a proxy between users and steemsql.

However, as I understand this, it is useful to separate logics from the presentation, as you are using the APIs in Chrome extension, thus intelligent users may view-source and get the API directly.

On here, line 86, you are missing a (NOLOCK) which might impose load to the steemsql server. And I am not sure this is the 'correct' way to get incoming delegation as you are making assumptions that the ID increases as the timestamp increases. You might want to look at alternative solution such as here

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