switch the encryption secret from localStorage to IndexedDB (because localStorage gets lost so often)

src/views/ImportAccountView.vue

@@ -87,13 +87,18 @@ import { Component, Vue } from "vue-facing-decorator";
 import { Router } from "vue-router";
 
 import { AppString, NotificationIface } from "@/constants/app";
-import { accountsDB, db, retrieveSettingsForActiveAccount } from "@/db/index";
+import {
+  accountsDBPromise,
+  db,
+  retrieveSettingsForActiveAccount,
+} from "@/db/index";
 import { MASTER_SETTINGS_KEY } from "@/db/tables/settings";
 import {
   DEFAULT_ROOT_DERIVATION_PATH,
   deriveAddress,
   newIdentifier,
 } from "@/libs/crypto";
+import { retrieveAccountCount } from "@/libs/util";
 
 @Component({
   components: {},
@@ -118,8 +123,7 @@ export default class ImportAccountView extends Vue {
   shouldErase = false;
 
   async created() {
-    await accountsDB.open();
-    this.numAccounts = await accountsDB.accounts.count();
+    this.numAccounts = await retrieveAccountCount();
     // get the server, to help with import on the test server
     const settings = await retrieveSettingsForActiveAccount();
     this.apiServer = settings.apiServer || "";
@@ -148,7 +152,7 @@ export default class ImportAccountView extends Vue {
         this.derivationPath,
       );
 
-      await accountsDB.open();
+      const accountsDB = await accountsDBPromise;
       if (this.shouldErase) {
         await accountsDB.accounts.clear();
       }