We got this same kind of thing working by using PostgreSQL env variables. First, set custom_variable_classes in your postgresql.conf. You can then use the SET command to set variables of that class, and use them in your functions:
and now I am wondering, where did you get your confidence that those variables are bound to sessions and NOT bound to server instances? My reading of that documentation let me stay in the assumption, those variables are the same across server instances....
Harald
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