Remove handling of runner timeouts

db/migrate/20210519134938_create_runners.rb

@@ -0,0 +1,12 @@
+class CreateRunners < ActiveRecord::Migration[6.1]
+  def change
+    create_table :runners do |t|
+      t.string :runner_id
+      t.references :execution_environment
+      t.references :user, polymorphic: true
+      t.float :waiting_time
+
+      t.timestamps
+    end
+  end
+end