pacman-database
Operate on the Arch Linux package database.
TLDR
Mark a package as implicitly installed
$ sudo pacman --database --asdeps [package_name]
Mark a package as explicitly installed
$ sudo pacman --database --asexplicit [package_name]
Check that all the package dependencies are installed
$ pacman --database --check
Check the repositories to ensure all specified dependencies are available
$ pacman --database --check --check
Display only error messages
$ pacman --database --check --quiet
Display help
$ pacman --database --help