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HabitatMap/AirCasting

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db/migrate/20111202135732_fill_session_start_and_end_time.rb

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class FillSessionStartAndEndTime < ActiveRecord::Migration[4.2]
  def up
    execute 'UPDATE sessions s SET start_time=(SELECT MIN(time) FROM measurements WHERE session_id=s.id), end_time=(SELECT MAX(time) FROM measurements WHERE session_id=s.id)'
  end

  def down; end
end