add a rake task to reset postgres sequences

lib/tasks/pgsequences.rake

@@ -0,0 +1,9 @@
+namespace :pgsequences do
+  desc "Reset all Postgres sequences"
+  task :reset => :environment do
+    ActiveRecord::Base.connection.tables.each do |t|
+      ActiveRecord::Base.connection.reset_pk_sequence!(t)
+      puts "Reset pk sequence on table: #{t}"
+    end
+  end
+end