Replace startup with attachment background migration

Iterates through `Message::id` index.

js/background.js

@@ -86,29 +86,23 @@
   console.log('Run migrations on database with attachment data');
   await Migrations0DatabaseWithAttachmentData.run({ Backbone });
 
-  await MessageDataMigrator.dangerouslyProcessAllWithoutIndex({
-    databaseName: Migrations0DatabaseWithAttachmentData.getDatabase().name,
-    minDatabaseVersion: Migrations0DatabaseWithAttachmentData.getDatabase().version,
-    upgradeMessageSchema,
-  });
-
   console.log('Storage fetch');
   storage.fetch();
 
   const idleDetector = new IdleDetector();
 
   idleDetector.on('idle', async () => {
-    // const database = Migrations0DatabaseWithAttachmentData.getDatabase();
-    // const batch = await MessageDataMigrator.processNextBatchWithoutIndex({
-    //   databaseName: database.name,
-    //   minDatabaseVersion: database.version,
-    //   upgradeMessageSchema,
-    // });
-    // console.log('Upgrade message schema:', batch);
-
-    // if (batch.done) {
-    //   idleDetector.stop();
-    // }
+    const database = Migrations0DatabaseWithAttachmentData.getDatabase();
+    const batch = await MessageDataMigrator.processNextBatchWithoutIndex({
+      databaseName: database.name,
+      minDatabaseVersion: database.version,
+      upgradeMessageSchema,
+    });
+    console.log('Upgrade message schema:', batch);
+
+    if (batch.done) {
+      idleDetector.stop();
+    }
   });
   /* eslint-disable */
 

js/modules/idle_detector.js

@@ -3,8 +3,8 @@
 const EventEmitter = require('events');
 
 
-const POLL_INTERVAL_MS = 30 * 1000;
-const IDLE_THRESHOLD_MS = 25;
+const POLL_INTERVAL_MS = 15 * 1000;
+const IDLE_THRESHOLD_MS = 20;
 
 class IdleDetector extends EventEmitter {
   constructor() {
@@ -14,10 +14,16 @@ class IdleDetector extends EventEmitter {
   }
 
   start() {
+    console.log('Start idle detector');
     this._scheduleNextCallback();
   }
 
   stop() {
+    console.log('Stop idle detector');
+    this._clearScheduledCallbacks();
+  }
+
+  _clearScheduledCallbacks() {
     if (this.handle) {
       cancelIdleCallback(this.handle);
     }
@@ -28,7 +34,7 @@ class IdleDetector extends EventEmitter {
   }
 
   _scheduleNextCallback() {
-    this.stop();
+    this._clearScheduledCallbacks();
     this.handle = window.requestIdleCallback((deadline) => {
       const { didTimeout } = deadline;
       const timeRemaining = deadline.timeRemaining();

js/modules/messages_data_migrator.js

@@ -237,7 +237,10 @@ const _processBatch = async ({ connection, upgradeMessageSchema } = {}) => {
     await settings.deleteAttachmentMigrationLastProcessedIndex(connection);
   }
 
+  const batchTotalDuration = Date.now() - fetchUnprocessedMessagesStartTime;
+
   return {
+    batchTotalDuration,
     done,
     fetchDuration,
     lastProcessedIndex,