text: 
  -- +migrate Up
  
  CREATE TABLE twilio_voice_errors (
      phone_number TEXT NOT NULL,
      error_message TEXT NOT NULL,
      outgoing BOOLEAN NOT NULL,
      occurred_at TIMESTAMP NOT NULL DEFAULT now()
  );
  CREATE INDEX ON twilio_voice_errors (phone_number, outgoing, occurred_at);
  
  -- +migrate Down
  
  DROP TABLE twilio_voice_errors;
  