Perl Dancer app behind nginx proxyPostgreSQL database with just three tables: "knots", "bounds" and "zeitgeist"all knot-related ad hoc information stored in knots.attributes hstoremain predicates: "is_parent", "has_bookmark", "contains" common to all instances, certain predicates "is_uttered_as", "illustrates", "is_symbiont_with" etc. instance-specific)