Fix the database schema

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23763/ did not
include all changes in the schema, and when merged into EE the wrong
version number was used.

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20181206121340) do
+ActiveRecord::Schema.define(version: 20181212104941) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -3380,6 +3380,7 @@ ActiveRecord::Schema.define(version: 20181206121340) do
   add_foreign_key "push_event_payloads", "events", name: "fk_36c74129da", on_delete: :cascade
   add_foreign_key "push_rules", "projects", name: "fk_83b29894de", on_delete: :cascade
   add_foreign_key "releases", "projects", name: "fk_47fe2a0596", on_delete: :cascade
+  add_foreign_key "releases", "users", column: "author_id", name: "fk_8e4456f90f", on_delete: :nullify
   add_foreign_key "remote_mirrors", "projects", name: "fk_43a9aa4ca8", on_delete: :cascade
   add_foreign_key "repository_languages", "projects", on_delete: :cascade
   add_foreign_key "resource_label_events", "epics", on_delete: :cascade