Would be great if they define inactive - I have a production site that's been running unchanged for probably 6-8 years that I throw on my portfolio but haven't

Would be great if they define inactive - I have a production site that's been running unchanged for probably 6-8 years that I throw on my portfolio but haven't really done any work on. Not even sure anymore how I'd set up my dev env. Won't be the biggest loss if it gets deleted but wouldn't like it. Other than seeing my credit card get billed, I'm about as inactive as it gets. I don't know if some of my resources are paid but others are free? (saw someone else talking about free instances of postgres in the comments here), I literally don't remember how the whole 'dyno' systems and add-on systems work anymore, just know that I'm paying for the webserver node or whatever. So won't be surprised if the DB or caching or something just shuts off.