Add last_used_at field to cluster agent token

changelogs/unreleased/322128-token-used-field.yml

+---
+title: Add last_used_at field to cluster agent token
+merge_request: 56023
+author:
+type: changed

db/migrate/20210309181019_add_last_used_at_to_cluster_agent_token.rb

+# frozen_string_literal: true
+
+class AddLastUsedAtToClusterAgentToken < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    add_column :cluster_agent_tokens, :last_used_at, :datetime_with_timezone
+  end
+end

db/schema_migrations/20210309181019

+a31b85b8ab0db2ad4daa5f2c15eacae97432e75e0e0a28f10d81f6a5aa94c8e0
\ No newline at end of file

db/structure.sql

@@ -11156,6 +11156,7 @@ CREATE TABLE cluster_agent_tokens (
     created_by_user_id bigint,
     description text,
     name text,
+    last_used_at timestamp with time zone,
     CONSTRAINT check_2b79dbb315 CHECK ((char_length(name) <= 255)),
     CONSTRAINT check_4e4ec5070a CHECK ((char_length(description) <= 1024)),
     CONSTRAINT check_c60daed227 CHECK ((char_length(token_encrypted) <= 255))