Global Variables / State Management

[dgotbaum]

I am trying to build an API that initially queries a database and stores the data in a dataframe that the different endpoints read from.

The problem is, I need to update this dataframe every 15 and the call takes a decent amount of time.

What is the best way to manage the global df and have it call a database every 15 minutes?

I tried using a middleware function but it cannot access the global "df".