Hi, in MS SQL Server you are able to make an entry of SESSION_CONTEXT read-only by passing the @read_only param to the sp_set_session_context function: "[ @read_only= ] { 0 | 1 } A flag of type bit. If 1, then the value for the specified key cannot be changed again on this logical connection. If 0 (default), then the value can be changed." See https://docs.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sp-set-session-context-transact-sql
I propose the same functionally for PostgreSQL - at least when setting "customized options" (the ones with a dot in the name: https://www.postgresql.org/docs/10/static/runtime-config-custom.html) The set_config(...) method therefore would end up like: set_config(setting_name, new_value, is_local, read_only) The equalient SET command could look something like: SET READONLY my_app.some_var = 'foo'; SET READONLY SESSION my_app.some_var = 'foo'; SET READONLY LOCAL my_app.some_var = 'foo'; Of course read-only would default to false for backwards compatibility. When setting READONLY for on SESSION config then that config is not allowed to be changed anymore until the connection gets closed - even when running RESET ALL or DISCARD ALL. When setting read-only for a transaction config "the effects of the SET LOCAL command disappear at function exit" will still be true, like written in https://www.postgresql.org/docs/10/static/sql-set.html. What do you think? Regards, Matthias