AWS Lambda: clearExpiredByTimeout seems not work with mysqlRateLimiter
the expired keys are not deleted from mysql database,  

const opts = {
  storeClient: pool,
  dbName: 'middle_users',
  tableName: 'rate_limiting', // all limiters store data in one table
  points: process.env['RATE_LIMITER_POINTS'], // Number of points
  duration: process.env['RATE_LIMITER_DURATION_SECOND'], // Per second(s)
  blockDuration: process.env['RATE_LIMITER_BLOCK_DURATION_SECOND'],
  clearExpiredByTimeout :true
  

};