Actually, I'm using:

     "db1" slist => lsdir("$(sys.workdir)", ".*\.tcdb", "false");
     "db2" slist => lsdir("$(sys.workdir)/state", ".*\.tcdb", "false");
     "db" slist => { @(db1), @(db2) }, policy => "ifdefined";

Wonder if `findfiles()` could be used in 3.6, of course this problem doesn't apply to 3.6....