DRAFT: multitime subquery index

.changeset/subquery-index.md

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+---
+'@core/sync-service': patch
+---
+
+New subquery index that reduces memory footprint and solves lag issues due to slow shape removal.

.changeset/subquery-memory-and-lag-fix.md

@@ -0,0 +1,5 @@
+---
+'@core/sync-service': patch
+---
+
+Reduced memory consumption of subqueries and fix lag issue caused by subquery removal.