/usr/share/pgmodeler/schemas/alter/extension.sch is in pgmodeler-common 0.9.1~beta-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # SQL definition for extension's attributes change
# PostgreSQL Version: 9.x
# CAUTION: Do not modify this file unless you know what you are doing.
# Code generation can be broken if incorrect changes are made.
%if ({pgsql-ver} != "9.0") %then
{alter-cmds}
%if {new-version} %then
[ALTER ] {sql-object} $sp {signature} [ UPDATE TO ] '{new-version}' $br
[-- ddl-end --] $br
%end
%end
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