Fix filter.sub() expanding cardinality in _1-Many_ relationships

Author: CarsonF

src/core/database/query/filters.ts

@@ -234,7 +234,11 @@ export const sub =
         sub
           .apply(matchSubNode)
           .apply(subBuilder()(value))
-          .return(`true as ${key}FiltersApplied`),
+          .return(`true as ${key}FiltersApplied`)
+          // Prevent filter from increasing cardinality above 1.
+          // This happens with `1-Many` relationships matched in `matchSubNode`.
+          // Note they are allowed to reduce cardinality to 0.
+          .raw('limit 1'),
       )
       .with('*');