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Consolidate shared behavior and correct snapshot histories (#811, a1c7168).
Upgrade notes
Named SQL hook identity: this release produces a one-time change in model versions for named SQL hooks. Afterwards, editing a hook's description or moving its file does not change model identity; executable hook content still does.
Dagster selectors:+x+ selects ancestors and descendants of the original matches, without pulling in siblings through ancestors. a~b selects every node on every path. Identical endpoints and endpoints with no directed path raise an input error, matching the planner.
Snapshot histories: hard-deleted keys reopen consistently, repeated delete/reappear cycles within one historical build are preserved, and replay does not create duplicate active versions. Unchanged historical timestamp reappearances start at observation time; changed timestamps retain their authored timestamp. Current-state timestamp reappearances start at execution time.
Existing full-history sources: the first build after upgrading can insert previously missed historical versions, including earlier reappearances. Existing history is retained.
SQL compatibility: SQL Server historical-change snapshots no longer render QUALIFY; rules scanning respects dialect quoting; SQL tests support UNION DISTINCT in expected CTEs and report the actual expected-CTE name.