I am now thoroughly confused.

My understanding of the above conditional insert statement was that it 
won’t persist a token if there is already a token with the same user_id and 
client_sig in the table. Alas, today once again I see an exception 
“MultipleResultsFound: Multiple rows were found for one_or_none()” and two 
token were in the table. To requests arrived 70ms apart and it seems that 
both were successful in creating tokens.

I expected that one would “outrace” the other and one would succeed to 
persist the token which the other would see when its insert runs.

What am I missing here?

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SQLAlchemy - 
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