fixed multiple foreign definition in schema.sql. fixes #28
fixed multiple foreign definition in schema.sql. fixes #28

reissmann/ddserver,iSC-Labs/ddserver,ddserver/ddserver,ddserver/ddserver,iSC-Labs/ddserver,iSC-Labs/ddserver,reissmann/ddserver,reissmann/ddserver,reissmann/ddserver,ddserver/ddserver,iSC-Labs/ddserver,ddserver/ddserver