Improve thread delete performance.

app/src/main/java/org/thoughtcrime/securesms/jobs/DeleteAbandonedAttachmentsJob.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.jobs
+
+import org.signal.core.util.logging.Log
+import org.thoughtcrime.securesms.database.SignalDatabase.Companion.attachments
+import org.thoughtcrime.securesms.dependencies.AppDependencies
+import org.thoughtcrime.securesms.jobmanager.Job
+import kotlin.time.Duration.Companion.days
+
+/**
+ * Deletes attachment files that are no longer referenced in the database.
+ */
+class DeleteAbandonedAttachmentsJob private constructor(parameters: Parameters) : Job(parameters) {
+
+  companion object {
+    private val TAG = Log.tag(DeleteAbandonedAttachmentsJob::class)
+    const val KEY = "DeleteAbandonedAttachmentsJob"
+
+    fun enqueue() {
+      AppDependencies.jobManager.add(DeleteAbandonedAttachmentsJob())
+    }
+  }
+
+  constructor() : this(
+    parameters = Parameters.Builder()
+      .setMaxInstancesForFactory(2)
+      .setLifespan(1.days.inWholeMilliseconds)
+      .build()
+  )
+
+  override fun serialize(): ByteArray? = null
+  override fun getFactoryKey(): String = KEY
+  override fun onFailure() = Unit
+
+  override fun run(): Result {
+    val deletes = attachments.deleteAbandonedAttachmentFiles()
+    Log.i(TAG, "Deleted $deletes abandoned attachments.")
+    return Result.success()
+  }
+
+  class Factory : Job.Factory<DeleteAbandonedAttachmentsJob> {
+    override fun create(parameters: Parameters, serializedData: ByteArray?): DeleteAbandonedAttachmentsJob {
+      return DeleteAbandonedAttachmentsJob(parameters)
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/jobs/JobManagerFactories.java

@@ -140,6 +140,7 @@ public final class JobManagerFactories {
       put(ConversationShortcutUpdateJob.KEY,         new ConversationShortcutUpdateJob.Factory());
       put(CopyAttachmentToArchiveJob.KEY,            new CopyAttachmentToArchiveJob.Factory());
       put(CreateReleaseChannelJob.KEY,               new CreateReleaseChannelJob.Factory());
+      put(DeleteAbandonedAttachmentsJob.KEY,         new DeleteAbandonedAttachmentsJob.Factory());
       put(DirectoryRefreshJob.KEY,                   new DirectoryRefreshJob.Factory());
       put(DonationReceiptRedemptionJob.KEY,          new DonationReceiptRedemptionJob.Factory());
       put(DownloadLatestEmojiDataJob.KEY,            new DownloadLatestEmojiDataJob.Factory());