Router and Filter based on canonical form

Maintain on disk a list of dynamic canonical query to multiplex, route or filter
json , yalm, xml can be used for persisting the rules

In memory a structure should store in LRU all ever seen template since startup + templates pin by user

maxadmin user would add rules like

SHOW TEMPLATES
the list id, template is printed

FILTER TEMPLATE 12
ROUTE TEMPLATE 10 TO 'backend2'
MULTIPLEX TEMPLATE 6 TO 'backend3'

rule matching can be done via a search hash of pinned template for current hash of current query template