LambdaKeepConnectionExample2.js

module.exports.myhandler = function (event, context, cb) {
  conn.query("SELECT * FROM items", (error, results) => {
    if (error) {
      cb(error, null)
    } else {
      cb(null, results)
    }
  })
}

If you are using another kind of client like Feature Flags, the same principle applies!
const LaunchDarkly = require('launchdarkly-node-server-sdk')

const ldClient = LaunchDarkly.init('SDK_KEY')
const ready = ldClient.waitForInitialization()
 
module.exports.myhandler = function (event, context, cb) {
    ready.then((client) => {
      // Check yout FF here
    })
}