Make backup batch operation concurrency configurable

service/src/main/java/org/whispersystems/textsecuregcm/configuration/dynamic/DynamicBackupConfiguration.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2025 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.configuration.dynamic;
+
+import java.time.Duration;
+
+/**
+ *
+ * @param deletionConcurrency How many cdn object deletion requests can be outstanding at a time per backup deletion operation
+ * @param copyConcurrency How many cdn object copy requests can be outstanding at a time per batch copy-to-backup operation
+ * @param usageCheckpointCount When doing batch operations, how often persist usage deltas
+ * @param maxQuotaStaleness The maximum age of a quota estimate that can be used to enforce a quota limit
+ */
+public record DynamicBackupConfiguration(
+  Integer deletionConcurrency,
+  Integer copyConcurrency,
+  Integer usageCheckpointCount,
+  Duration maxQuotaStaleness) {
+
+  public DynamicBackupConfiguration {
+    if (deletionConcurrency == null) {
+      deletionConcurrency = 10;
+    }
+    if (copyConcurrency == null) {
+      copyConcurrency = 10;
+    }
+    if (usageCheckpointCount == null) {
+      usageCheckpointCount = 10;
+    }
+    if (maxQuotaStaleness == null) {
+      maxQuotaStaleness = Duration.ofSeconds(10);
+    }
+  }
+
+  public DynamicBackupConfiguration() {
+    this(null, null, null, null);
+  }
+}

service/src/main/java/org/whispersystems/textsecuregcm/configuration/dynamic/DynamicConfiguration.java

@@ -64,6 +64,10 @@ public class DynamicConfiguration {
   @Valid
   DynamicRestDeprecationConfiguration restDeprecation = new DynamicRestDeprecationConfiguration(Map.of());
 
+  @JsonProperty
+  @Valid
+  private DynamicBackupConfiguration backup = new DynamicBackupConfiguration();
+
   public Optional<DynamicExperimentEnrollmentConfiguration> getExperimentEnrollmentConfiguration(
       final String experimentName) {
     return Optional.ofNullable(experiments.get(experimentName));
@@ -114,4 +118,7 @@ public class DynamicConfiguration {
     return restDeprecation;
   }
 
+  public DynamicBackupConfiguration getBackupConfiguration() {
+    return backup;
+  }
 }