[otrs] external customer backend with filter

[Markus Nagel]

Hi all,
I've figured out how to set up an external DB Backend for customer 
users. It shall just have the function of a kind of address book, these 
customers shall not be able to login.
The external backend also is a MySQL-database on the same mashine.
What I'd like to do is filtering the amount of addresses in this address 
book, let's say there exists a field called "access" in the external 
database table and public addresses do have the entry "group" or "all", 
how do I configure otrs to only show those entries with "group" or "all" 
in the field "access". Which "key" do I use and which value should it have?
Something like CustomerUserValidFilter for LDAP-Backends perhaps?

Thanks in advance for your suggestions.

Sincerely
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