After digging through the sqlite3 photos.db proxy derivaties are stored in a path as a hash function of the RKMaster.modelId.
For example RKMaster.modelId is 121629 the hexidecimal value of this is 1DB1D. The proxies are stored as resouerces/proxies/derivatives/db/00/db1d/UNADJUSTEDNONRAW_mini_db1b.jpg .
How can I find the proxy derivative based on a RKMaster.modelId?
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