Update postgresql with install info

config.toml

@@ -7,5 +7,5 @@ enableGitInfo = true
 [params]
 	BookLogo = 'logo.svg'
 	BookRepo = 'https://git.edgarpierre.fr/edpibu/blog'
-	BookDateFormat = 2006-01-02
+	BookDateFormat = '2006-01-02'
 	BookComments = false

content/docs/postgresql.md

@@ -1,5 +1,5 @@
 ---
-title: "Postgresql"
+title: "PostgreSQL"
 weight: 1
 # bookFlatSection: false
 # bookToc: true
@@ -9,8 +9,18 @@ weight: 1
 # bookSearchExclude: false
 ---
 
-# Postgresql
-*On this page, `$` means the command must be run as a user with adequate rights such as the `postgresql` user.*
+# PostgreSQL
+
+*On this page, `$` means the command must be run as a user with adequate rights such as the `postgres` user.*
+
+## Installation
+### Archlinux
+
+On archlinux, PostgreSQL can be installed using the `postgresql` package from `[extra]`.
+
+Major PostgreSQL upgrades are breaking. Instructions from the [official documentation](https://www.postgresql.org/docs/current/upgrading.html) should be followed.
+
+Upgrades can be prevented by adding `postgresql` and `postgresql-libs` to `IgnorePkg` in `/etc/pacman.conf`.
 
 ## Filesystem preparation
 In case a Btrfs filesystem is used, Copy-on-Write should be disabled first.
@@ -22,7 +32,7 @@ The database can be initialized using the following command. Locale defaults to
 $ initdb --locale C.UTF-8 --encoding=UTF8 -D /var/lib/postgres/data --data-checksums
 ```
 
-Postgresql can then be started using the `postgresql` systemd service.
+PostgreSQL can then be started using the `postgresql` systemd service.
 
 ## Usage
 ### Creating users