This proposal is about access managenent to custom variables. Currently any user can modify it, and isn't way to protect value:

* variables are controlled from modules
* syntax of custom variables is without changes
* all modules are safe

* reset_custom_variable(cusvar);  ... set default from postgresql.conf
* revoke_custom_variable(READ|MODIFY, cusvar, roleid);
* grant_custom_variable(READ|MODIFY, cusvar, roleid);

Related discussion:

Pavel Stehule

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