/// <reference path="../pb_data/types.d.ts" />
migrate((app) => {
  const collectionsToDrop = [
    "learn_progress",
    "quiz_banks",
    "quiz_cache",
    "quiz_results"
  ];

  for (const name of collectionsToDrop) {
    try {
      const collection = app.findCollectionByNameOrId(name);
      if (collection) {
        app.delete(collection);
      }
    } catch (err) {
      // Ignore if not found
    }
  }
}, (app) => {
  // Downgrade would normally recreate these, but we omit it here for simplicity
  // since they are deprecated.
})