Add Rate Limiting

[nathanclevenger]

No description provided.

[sam-lippert]

@nathanclevenger How should this be implemented? My first thought is to record every transaction to be counted and clear them out if the previous transaction was last month. With that, we also need to be able to determine the user's access plan to check the number of requests against the limit. Should that come from another service?

[nathanclevenger]

I'm thinking of keeping a counter which is year-month and so we always increment, never clear ... and we can see historical trends ... it's basically a counter by month ... separately we could use a counter by minute (maybe just a rounded ticks to be 100 sec for simplicity?) in the DO for rate limiting