Add unique ID to each observation #46
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Everyone seems to like the idea of using a hash for observation ID, so merging |
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Needed if we want everything to be uniquely and easily traceable back to raw data.
Right now using only 16/32 hash characters; haven't seen any collisions yet, but they are possible.
For this to work, data need to be pivoted to long form in L0, not L1_normalize.