blog: add a post on running two rule sets against one table

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Explains why a physical table carries one rule set in Data Controller
(MPE_TABLES and MPE_VALIDATIONS are both keyed on the physical libref.dataset),
then covers the two ways to get more than one:

- two librefs over the same data (recommended - configuration only, no hooks,
  no copies, filtering and every other editor behaviour unchanged)
- an empty mirror plus PRE_EDIT_HOOK (show the live rows) and POST_EDIT_HOOK
  (re-point the changeset at the real table with call symputx, not %let). The
  target table must itself be registered in MPE_TABLES.

Screenshots are from the demo estate.

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2026-09-24 15:38:39 +00:00

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