insights: aggregation results are incorrectly cached when `case` is changed

Created by: leonore

loom: https://www.loom.com/share/5fac305f2f554076848ac4708ba0a603

1. run file:test ([a-z]+)Schema file:batches query (or similar query that will return different results when case is on and off)
2. watch aggregations are correct
3. turn case sensitivity on
4. see aggregations are not changed when we should not be showing capitalised results
5. refreshing the page shows the correct result

/cc @joelkw @felixfbecker @vovakulikov