Slow unbundled blocks query

[segfault-magnet]

2024-10-31T13:20:21.871545982Z stderr F {"timestamp":"2024-10-31T13:20:21.871419Z","level":"WARN","fields":{"message":"slow statement: execution time exceeded alert threshold","summary":"SELECT fb.* FROM fuel_blocks …","db.statement":"\n\nSELECT\n fb.*\nFROM\n fuel_blocks fb\nWHERE\n fb.height >= $1\n AND NOT EXISTS (\n SELECT\n 1\n FROM\n bundles b\n WHERE\n fb.height BETWEEN b.start_height AND b.end_height\n )\nORDER BY\n fb.height\nLIMIT\n $2\n","rows_affected":2625,"rows_returned":2625,"elapsed":"1.887714259s","elapsed_secs":1.887714259,"slow_threshold":"1s"},"target":"sqlx::query","line_number":120}

It happens when we set the lookback to around 100k blocks.

We need to look into this since we aim to set the lookback to a few million.

An index on the bundle heights should fix but needs investigating.