From experience, databases are always meant to be accessed online because having an accurate offline database could be extensive in terms of storage if your game would become famous in the future. Also do note that Trello is not meant for data storage and should not be used to replace actual database services. I could see a potential discord integration, however this is also not a platform for these kinds of use cases and may lead to discord account termination.
You’re better off using the data store service provided by roblox or other data storage services that are reliable and do not have severe Http limitations. Please note that external database services are not free and you’d have to settle that concern on your end.
Another option you could go for is your own database in your home, this is completely under your control and you may customise to your desire, however this would require maintenance and usually costs several thousands to keep up in the long run. I don’t know anyone who has resorted to this, I’d only recommend this to devoted developers who have knowledge on web development as creating the environment is quite complex.