Crud update

[arkanoider]

Hi @grunch ,

first step to improve and clean database calls:

• Removed a quite big number of functions in db.rs , as told in chat we need to fix an issue of rust compiler in the case of calls inside a spawned task, we will work on.
• I took the occasion to remove log crate moving to tracing in all files, it's more powerful for future uses and manage also all the functions of log.

let me know...

[grunch]

what a great PR, LGTM 🚀