Use different Database for different users

[ricardobrg]

As a developer I need to ensure that each account database file has a unique name.

When the user changes the logged in TIKI account, the app tries to open the database with the new account private key, but it cannot be unencrypted because the key is different.

Acceptance criteria: 1 - Each account has its own unique database file. 2 - When login/logout the correct database is loaded with the specific cards and state.

[mike-audi]

@ricardobrg to encode the address as hex to ensure safe filename chars

[ricardobrg]

[ricardobrg]

hex encoded filenames