fix the wrong schema

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180307164427) do
+ActiveRecord::Schema.define(version: 20180308052825) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -2293,7 +2293,9 @@ ActiveRecord::Schema.define(version: 20180307164427) do
   end
 
   add_index "taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "taggings_idx", unique: true, using: :btree
+  add_index "taggings", ["tag_id"], name: "index_taggings_on_tag_id", using: :btree
   add_index "taggings", ["taggable_id", "taggable_type", "context"], name: "index_taggings_on_taggable_id_and_taggable_type_and_context", using: :btree
+  add_index "taggings", ["taggable_id", "taggable_type"], name: "index_taggings_on_taggable_id_and_taggable_type", using: :btree
 
   create_table "tags", force: :cascade do |t|
     t.string "name"
@@ -2614,6 +2616,7 @@ ActiveRecord::Schema.define(version: 20180307164427) do
   add_foreign_key "clusters", "users", on_delete: :nullify
   add_foreign_key "clusters_applications_helm", "clusters", on_delete: :cascade
   add_foreign_key "clusters_applications_ingress", "clusters", on_delete: :cascade
+  add_foreign_key "clusters_applications_prometheus", "clusters", on_delete: :cascade
   add_foreign_key "clusters_applications_runners", "ci_runners", column: "runner_id", name: "fk_02de2ded36", on_delete: :nullify
   add_foreign_key "clusters_applications_runners", "clusters", on_delete: :cascade
   add_foreign_key "container_repositories", "projects"