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1. Not sure what you mean exactly 2. Right now, the only way is to export and import data from MongoDB 3. What kind of validation do you mean? 4. Nothing specific built in for this

For forced value and other ease of use setup, you can wrap gb client, that's what I'm looking at

If you are using the Javascript SDK and want to update your app when any feature value changes, you can use setRenderer (that's what the React SDK uses under the hood)

growthbook.setRenderer(() => {
  // A feature has changed, re-render your app here
})