feat: 🎸 Add migration check to delete index DB when updating (#2241)

* feat: 🎸 Add migration check to delete index DB when updating

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-13223

addons/api/addon-test-support/helpers/indexed-db.js

@@ -20,9 +20,9 @@
  * @param hooks
  */
 export function setupIndexedDb(hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(async function () {
     const indexedDb = this.owner.lookup('service:indexed-db');
-    indexedDb.setup(`test-indexed-db-${Date.now()}`);
+    await indexedDb.setup(`test-indexed-db-${Date.now()}`);
   });
 
   hooks.afterEach(async function () {

addons/api/addon/services/indexed-db.js

@@ -97,23 +97,42 @@ const unconvertFields = (result, object, schema, serializer) => {
 
 /**
  * Service to encapsulate the IndexedDB implementation. To use this service, call
- * `setup` from the application root and
+ * `setup` from the application root. This will create the database and the necessary indexes.
+ *
+ * Make sure to increment the version number of the database whenever the indexes change.
+ * This will delete the old database and create a new one with the new indexes.
  */
 export default class IndexedDbService extends Service {
   // =attributes
   #db;
+  #version = 2;
+
   get db() {
     return this.#db;
   }
 
-  setup(dbName) {
+  async setup(dbName) {
     // Don't run setup again if we already have one or if we didn't get a name
     if (this.#db || !dbName) {
       return;
     }
 
+    const doesDbExist = await Dexie.exists(dbName);
+
+    // If the database already exists, open the database and
+    // check if the version is a lower version than the current one
+    if (doesDbExist) {
+      const dbVerifier = new Dexie(dbName);
+      await dbVerifier.open();
+      if (dbVerifier.verno < this.#version) {
+        await dbVerifier.delete();
+      } else {
+        dbVerifier.close();
+      }
+    }
+
     this.#db = new Dexie(dbName);
-    this.#db.version(2).stores(modelIndexes);
+    this.#db.version(this.#version).stores(modelIndexes);
   }
 
   /**