```ruby
# frozen_string_literal: true

module Ci
  # The purpose of this class is to store Build related data that can be disposed.
  # Data that should be persisted forever, should be stored with Ci::Build model.
  class BuildMetadata < ActiveRecord::Base
    extend Gitlab::Ci::Model
    include Presentable
    include ChronicDurationAttribute

    self.table_name = 'ci_builds_metadata'

    belongs_to :build, class_name: 'CommitStatus',
                       polymorphic: true, # rubocop:disable Cop/PolymorphicAssociations
                       inverse_of: :metadata
    belongs_to :project

    before_create :set_build_project

    validates :build, presence: true

    serialize :config_options, Serializers::JSON # rubocop:disable Cop/ActiveRecordSerialize
    serialize :config_variables, Serializers::JSON # rubocop:disable Cop/ActiveRecordSerialize

    chronic_duration_attr_reader :timeout_human_readable, :timeout

    enum timeout_source: {
        unknown_timeout_source: 1,
        project_timeout_source: 2,
        runner_timeout_source: 3
    }

    def update_timeout_state
      return unless build.runner.present?

      project_timeout = project&.build_timeout
      timeout = [project_timeout, build.runner.maximum_timeout].compact.min
      timeout_source = timeout < project_timeout ? :runner_timeout_source : :project_timeout_source

      update(timeout: timeout, timeout_source: timeout_source)
    end

    private

    def set_build_project
      self.project_id ||= self.build.project_id
    end
  end
end
```

Simplify relation between a build and metadata
user
```ruby
# frozen_string_literal: true

module Ci
  # The purpose of this class is to store Build related data that can be disposed.
  # Data that should be persisted forever, should be stored with Ci::Build model.
  class BuildMetadata < ActiveRecord::Base
    extend Gitlab::Ci::Model
    include Presentable
    include ChronicDurationAttribute

    self.table_name = 'ci_builds_metadata'

    belongs_to :build, class_name: 'CommitStatus'
    belongs_to :project

    before_create :set_build_project

    validates :build, presence: true

    serialize :config_options, Serializers::JSON # rubocop:disable Cop/ActiveRecordSerialize
    serialize :config_variables, Serializers::JSON # rubocop:disable Cop/ActiveRecordSerialize

    chronic_duration_attr_reader :timeout_human_readable, :timeout

    enum timeout_source: {
        unknown_timeout_source: 1,
        project_timeout_source: 2,
        runner_timeout_source: 3
    }

    def update_timeout_state
      return unless build.runner.present?

      project_timeout = project&.build_timeout
      timeout = [project_timeout, build.runner.maximum_timeout].compact.min
      timeout_source = timeout < project_timeout ? :runner_timeout_source : :project_timeout_source

      update(timeout: timeout, timeout_source: timeout_source)
    end

    private

    def set_build_project
      self.project_id ||= self.build.project_id
    end
  end
end
```
assistant