Stocktwits iPhone app drains my battery overnight
I have this app called Stocktwits, which I use on a regular basis, and it's the second time I have noticed it completely drained my battery overnight.
The first time it went from 90% to about 20%, and it had used Gigabytes of mobile data.
Yesterday it took my phone from 73% all the way to 0%.
I have already disabled mobile data usage, but I don't know how to disable this app from running in the background. I don't actually ever want this app to run in the background.
There's no option for background app refresh. And the options in settings are limited to Siri, notifications and mobile battery usage. There's nothing about location usage or anything like that.
What else can I do? (Besides the obvious deleting of the app)
iPhone XR