[DNM] Enable error_sql extension

Author: segiddins

lib/gemstash/db.rb

@@ -10,6 +10,7 @@ module DB
     Sequel::Model.db = Gemstash::Env.current.db
     Sequel::Model.raise_on_save_failure = true
     Sequel::Model.plugin :timestamps, update_on_create: true
+    Sequel::Model.db.extension :error_sql
     Sequel::Model.db.extension :string_agg
     Sequel::Model.db.extension :schema_dumper
     autoload :Authorization, "gemstash/db/authorization"