As someone who is building a similar app, for a similar competition (but in Boston): Don't combine your data structures / stores. Use the store / structure th

As someone who is building a similar app, for a similar competition (but in Boston): Don't combine your data structures / stores. Use the store / structure that is most appropriate for the given task. Memory is cheap vs compute time. Hint: many can be only in memory stores that periodically sync to a backing store for updates.