In case the realm serves as parent to other realms within the same torus
installation, the following function allows for fast propagation of changes
to child realms.
So why this class? I find it way cleaner to percolate that from the
lowest-level and then throw 404 in the container rather than checking
for nulls on each level.
Retrieve a list of override records within this realm, the query
parameter is used ONLY to early filter out false matches, that is
records that CONTAIN a given query field but the value DOES NOT match.
Stores parent records for the given parent, updates each world record
with an ID unique to this realm (so world records can be looked up without
specifying parent)