Refactor API to make less calls

[souvorinkg]

Now that the API is working, we shouldn't make an API call every time we want some data, because we often look at the same trees over and over. Instead, let's check the DB for a valid description, then make an API call if it's not there. When we get a new API, we can write out the information we need to the DB for future calls.

[souvorinkg]

Step #1: save the perenual ID's to the DB.