feat: psql changes on master only

- add fact to detect if a psql host is a slave
- only import users/db/grants on master

modules/libs/lib/facter/psql_is_slave.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+Facter.add(:psql_is_slave) do
+  setcode do
+    # Command to check if PostgreSQL is in recovery mode
+    command = 'sudo -iu postgres psql -tAc "select pg_is_in_recovery()"'
+
+    # Execute the command and map the output to a boolean value
+    { 't' => true, 'f' => false }[Facter::Core::Execution.execute(command, on_fail: nil)]
+  end
+end

site/profiles/manifests/sql/patroni.pp

@@ -88,11 +88,14 @@ class profiles::sql::patroni (
 
   }
 
+  # only apply changes to DBs/Users/Grants on master
+  if ! $facts['psql_is_slave'] {
     # collect exported resources
     $tag = "${facts['country']}-${facts['region']}-${facts['environment']}"
     Profiles::Sql::Postgres::Db <<| tag == $tag |>> {}
     Profiles::Sql::Postgres::User <<| tag == $tag |>> {}
     Profiles::Sql::Postgres::Grant <<| tag == $tag |>> {}
+  }
 
   if $postgres_exporter_enabled {
     class { 'prometheus::postgres_exporter':