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Historically we've had each release branch include all prior branches' notes, including minor-release changes, back to the beginning of the project. That's basically an O(N^2) proposition, and it was starting to catch up with us: as of HEAD the back-branch release notes alone accounted for nearly 30% of the documentation. While there's certainly some value in easy access to back-branch notes, this is getting out of hand. Hence, switch over to the rule that each branch contains only its own release notes. So as to not make older notes too hard to find, each branch will provide URLs for the immediately preceding branches' release notes on the project website. There might be value in providing aggregated notes across all branches somewhere on the website, but that's a task for another day. Discussion: https://postgr.es/m/cbd4aeb5-2d9c-8b84-e968-9e09393d4c83@postgresql.org
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/.