chore(mdn): avoid NULL on page URL/referrer + subscription type #8101
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Description
Updates the
mdn.legacy_{action,page}
views to avoidNULL
values on these three fields:(The reason is that we have several existing queries that filter with
LIKE '{{ param }}'
whereparam
is a query parameter defaulting to%
, andNULL LIKE '%'
is false.)Related Tickets & Documents
Reviewer, please follow this checklist