if the hostname of the computer changes then akonadi does not start. The problem seems that the socket address

/home/[user]/.local/share/akonadi/socket-[hostname]

is harcoded in 
.local/share/akonadi/db_data/postgresql.conf

as

unix_socket_directory = '/home/[user]/.local/share/akonadi/socket-[hostname]'

Reproducible: Always

Steps to Reproduce:
1. Create a new empty user /akonadi configuration with postgresql backend and default options.
2. Change the hostname of the computer.
3. Reboot
Actual Results:  
postgresql refuses to start with error 

stdout: "esperando que el servidor se inicie....FATAL:  no se pudo crear el archivo de bloqueo «/home/user/.local/share/akonadi/socket-oldhostname/.s.PGSQL.5432.lock»: No existe el fichero o el directorio

Expected Results:  
hostname changes should not affect akonadi. It does not for .kde/ socket-cache-tmp symlinks