refactor: dropping noteHashLeafIndexMap #19443
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AztecBot
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Tracking the note hash leaf indexes during execution is unnecessary because when building the kernel hints we are able to obtain the note hash membership witness directly by value instead of by index. I guess the API obtaining the witness by value might be a bit slower since we first need to find where in the tree the it is while index directly points into a tree. But even if this is the case it doesn't seem to be worth the complexity (if the slowness turns out to be a problem we can always store a map from note hash to index in the node given that the note hashes are unique). Decided to do this when trying to tackle [F-218](https://linear.app/aztec-labs/issue/F-218/remove-note-and-nullif-indexes-from-note-and-event-storage).
benesjan
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This was referenced Jan 9, 2026
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Tracking the note hash leaf indexes during execution is unnecessary because when building the kernel hints we are able to obtain the note hash membership witness directly by value instead of by index. I guess the API obtaining the witness by value might be a bit slower since we first need to find where in the tree the it is while index directly points into a tree. But even if this is the case it doesn't seem to be worth the complexity (if the slowness turns out to be a problem we can always store a map from note hash to index in the node given that the note hashes are unique).
Decided to do this when trying to tackle F-218.