hub v0.136.0: nightly VACUUM INTO snapshot, keep 2 (R-173 decision A); hub PVC 2Gi + Longhorn default group; 09 rulings 125-127; 05 §16.3

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

hub/internal/store/snapshot.go

@@ -0,0 +1,17 @@
+package store
+
+import (
+	"context"
+	"fmt"
+)
+
+// SnapshotInto writes a consistent, compacted copy of the whole database to path with SQLite's `VACUUM INTO`
+// (R-173, hub v0.136.0). One statement inside one read transaction: it sees one point in time and includes every
+// committed write still sitting in hub.db-wal — unlike copying hub.db (+ -wal) as files while the hub writes. The
+// target must not exist. Pinned by internal/dbsnap (TestSnapshot_*).
+func (s *Store) SnapshotInto(ctx context.Context, path string) error {
+	if _, err := s.db.ExecContext(ctx, `VACUUM INTO ?`, path); err != nil {
+		return fmt.Errorf("store: VACUUM INTO %s: %w", path, err)
+	}
+	return nil
+}