diff --git a/db/migrate/20180719105747_drop_doorkeeper_tables.rb b/db/migrate/20180719105747_drop_doorkeeper_tables.rb
new file mode 100644
index 00000000..c6538155
--- /dev/null
+++ b/db/migrate/20180719105747_drop_doorkeeper_tables.rb
@@ -0,0 +1,7 @@
+class DropDoorkeeperTables < ActiveRecord::Migration[5.2]
+  def change
+    drop_table :oauth_applications
+    drop_table :oauth_access_grants
+    drop_table :oauth_access_tokens
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 258faea8..c1239f9f 100644
--- a/db/schema.rb
+++ b/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: 2018_07_18_142723) do
+ActiveRecord::Schema.define(version: 2018_07_19_105747) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -84,44 +84,6 @@
     t.index ["user_id"], name: "index_messages_on_user_id"
   end
 
-  create_table "oauth_access_grants", force: :cascade do |t|
-    t.integer "resource_owner_id", null: false
-    t.integer "application_id", null: false
-    t.string "token", null: false
-    t.integer "expires_in", null: false
-    t.text "redirect_uri", null: false
-    t.datetime "created_at", null: false
-    t.datetime "revoked_at"
-    t.string "scopes"
-    t.index ["token"], name: "index_oauth_access_grants_on_token", unique: true
-  end
-
-  create_table "oauth_access_tokens", force: :cascade do |t|
-    t.integer "resource_owner_id"
-    t.integer "application_id"
-    t.string "token", null: false
-    t.string "refresh_token"
-    t.integer "expires_in"
-    t.datetime "revoked_at"
-    t.datetime "created_at", null: false
-    t.string "scopes"
-    t.index ["refresh_token"], name: "index_oauth_access_tokens_on_refresh_token", unique: true
-    t.index ["resource_owner_id"], name: "index_oauth_access_tokens_on_resource_owner_id"
-    t.index ["token"], name: "index_oauth_access_tokens_on_token", unique: true
-  end
-
-  create_table "oauth_applications", force: :cascade do |t|
-    t.string "name", null: false
-    t.string "uid", null: false
-    t.string "secret", null: false
-    t.text "redirect_uri", null: false
-    t.string "scopes", default: "", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.boolean "confidential", default: true, null: false
-    t.index ["uid"], name: "index_oauth_applications_on_uid", unique: true
-  end
-
   create_table "scores", force: :cascade do |t|
     t.integer "state", default: 7, null: false
     t.integer "score"
diff --git a/docs/erd.png b/docs/erd.png
index 8b9b372f..8e95f1e6 100644
Binary files a/docs/erd.png and b/docs/erd.png differ