Some Nostur database stats:

Nostur stores every item you see and then removes everything you don't need after a few days, while keeping your own posts, bookmarks etc. Contact info is kept forever (for now)

This is after 9 months of usage:

On Desktop:

Contacts: 38.489

Events (all kinds): 76.388

Events by kind:

Contact lists: 2.917

Articles and badges: 1.232

Posts: 21.856

Reactions: 23.991

Reposts: 4.425

Zaps: 20.147

Size on disk: 290 MB

On my phone:

Contacts: 37.051

Events (all kinds): 68.414

Events by kind:

Contact lists: 1644

Articles and badges: 1.029

Posts: 26.957

Reactions: 25.126

Reposts: 4.145

Zaps: 7.785

Size on disk: 198 MB