cesar/cdk: Cashu Development Kit @ bb46e85683258f71af6e66adb61b9c14242f2509

Cesar Rodas 960abb63a4 Fixed bug with foreign keys		преди 7 месеца
..
migrations	003a8f1b47 feat: signature on mint witness	преди 10 месеца
error.rs	8fe0982c6d Introduce `cashu` to host the shared types, traits and other common code (#519)	преди 9 месеца
memory.rs	c6118b1f8f Drop the in-memory database	преди 7 месеца
mod.rs	960abb63a4 Fixed bug with foreign keys	преди 7 месеца