5573f2a2291d3ce4a54b778498c584e98471b640
B5: the candidate CTE's src_pri=1 (primitive-instance) UNION ALL branch was always excluded by the final WHERE r.src_pri=0, so it added work with no output change. Remove the branch and the now-constant src_pri column/filter. An alarm anchor is always a user attribute, so output is identical.
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