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Pin that a literal end before applied_through reads raw on the grid and MCP (#3953) - #4381
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Refs #3953. Test-only; no product change and no CHANGELOG entry.
Adds a live pin for one Query Store identity with two snapshots of the same interval: one inside the window, and a later re-fetch past a literal window end. Both the viewer grid read and the MCP/web top read must return raw's answer for the literal end, with zero reads of
query_store_interval_wide, becauseUseTable's literal-end clause sends a literal end beforeapplied_throughto raw.On the same seeded store, an open end, or a literal end at or after
applied_through, routes to the table and returns its latest snapshot. That proves the table path is live, and that the literal-end clause alone is what keeps the straddling read on raw.