API Gateway has maximum 30 second timeout

[andrewbt]

Per: http://docs.aws.amazon.com/apigateway/latest/developerguide/limits.html

Integration timeout 30 seconds for all integration types, including Lambda, Lambda proxy, HTTP, HTTP proxy, and AWS integrations.

For very large "SELECT *" queries on large CARTO files, we could hit this timeout. Also, for extremely complex SQL.

@timwis what are your largest datasets? For the crimes one and others, I'm thinking links through the proxy like data.phila.gov/api/v2/sql?q=select * from crimes as the "official export links" on opendataphilly.org or elsewhere might not actually work because of this timeout.