delete unused languages_users table from db

db/migrate/20230809002819_drop_languages_users.rb

@@ -0,0 +1,9 @@
+class DropLanguagesUsers < ActiveRecord::Migration[7.0]
+  def up
+    drop_table :languages_users
+  end
+
+  def down
+    fail ActiveRecord::IrreversibleMigration
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_07_30_103110) do
+ActiveRecord::Schema[7.0].define(version: 2023_08_09_002819) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -370,13 +370,6 @@
     t.index ["casa_org_id"], name: "index_languages_on_casa_org_id"
   end
 
-  create_table "languages_users", id: false, force: :cascade do |t|
-    t.bigint "language_id", null: false
-    t.bigint "user_id", null: false
-    t.index ["language_id"], name: "index_languages_users_on_language_id"
-    t.index ["user_id"], name: "index_languages_users_on_user_id"
-  end
-
   create_table "learning_hour_types", force: :cascade do |t|
     t.bigint "casa_org_id", null: false
     t.string "name"