budibase/packages/server/utilities/createInstanceDb.js

const { common, getAppApis } = require("@budibase/core")
const { getDatabaseManager } = require("./databaseManager")

module.exports = async (productSetId, productId, versionId) => {
  const databaseManager = getDatabaseManager(datastoreModule)
  const masterDatastore = datastoreModule.getDatastore(
    databaseManager.masterDatastoreConfig
  )

  const master = await getAppApis(masterDatastore)

  const productSet = await master.recordApi.load(
    common.joinKey("ProductSets", productSetId)
  )

  const prodcutSetDatastore = datastoreModule.getDatastore(
    productSet.datastoreConfig
  )

  const productSetApis = await getAppApis(prodcutSetDatastore)
  const product = await productSetApis.recordApi.load(
    common.joinKey("Products", productId)
  )

  const version = await productSetApis.recordApi.load(
    common.joinKey("Products", productId, "Versions", versionId)
  )

  const instance = await productSetApis.recordApi.getNew(
    common.joinKey(product.key, "Versions")
  )
}