budibase/packages/server/initialise/createInstanceDb.js

const { initialiseData, setupDatastore } = require("@budibase/core")
const getDatabaseManager = require("../utilities/databaseManager")
const { applictionVersionPackage } = require("../utilities/createAppPackage")
const { determineVersionId } = require("../utilities/runtimePackages")

module.exports = async (context, datastoreModule, app, instance) => {
  const databaseManager = getDatabaseManager(
    datastoreModule,
    context.config.datastoreConfig
  )

  await databaseManager.createEmptyInstanceDb(app.id, instance.id)

  const dbConfig = databaseManager.getInstanceDatastoreConfig(
    app.id,
    instance.id
  )

  const datastore = setupDatastore(datastoreModule.getDatastore(dbConfig))

  const versionId = determineVersionId(instance.version)

  const appPackage = await applictionVersionPackage(
    context,
    app.name,
    versionId,
    instance.key
  )

  await initialiseData(
    datastore,
    appPackage.appDefinition,
    appPackage.accessLevels
  )

  return dbConfig
}