As far as I know, a proxy does not give you this functionality. There are other commercial products that perform this request routing in accordance with the sharding policy, and not only that they can also run queries in all databases and combine the results, review data for addr or delete dbs on the Internet, control and manage the system , More. I recommend that you look at Scalebase (the disclaimer that I work there) at www.scalebase.com.
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