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A bootstrap user who is not a superuser will still own many important system objects, such as the pg_catalog schema, that will likely allow that user to regain superuser status. Therefore, allowing the superuser property to be removed from the superuser creates a false perception of security where none exists. Although removing superuser from the bootstrap user is also a bad idea and should be considered unsupported in all released versions, no back-patch, as this is a behavior change. Discussion: http://postgr.es/m/CA+TgmoZirCwArJms_fgvLBFrC6b=HdxmG7iAhv+kt_=NBA7tEw@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.