c# - LocalDb as storage for WCF service -

i planning following , asking advice / critics on setup.

• we want move our user management code wcf service our client apps retrieve user data through wcf api only.
• the api (library) shall using localdb storage default.
• the wcf service shall use library , expose functionality.

is sensible approach? want keep user storage close service, localdb run when install service running networkservice? can go localsystem if required, of course.

if running service, services (e.g. both running localsystem) able access localdb?

considering deployment: if api creates / connects localdb, other restrictions apply deployment of wcf service via msi other ".net 4.0.2 needed"?