Add reregistration flag to account creation response

service/src/main/java/org/whispersystems/textsecuregcm/entities/AccountCreationResponse.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2025 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonUnwrapped;
+import io.swagger.v3.oas.annotations.media.Schema;
+
+// Note, this class cannot be converted into a record because @JsonUnwrapped does not work with records until 2.19. We are on 2.18 until Dropwizard’s BOM updates.
+// https://github.com/FasterXML/jackson-databind/issues/1467
+public class AccountCreationResponse {
+
+  @JsonUnwrapped
+  private AccountIdentityResponse identityResponse;
+
+  @Schema(description = "If true, there was an existing account registered for this number")
+  private boolean reregistration;
+
+  public AccountCreationResponse() {
+  }
+
+  public AccountCreationResponse(AccountIdentityResponse identityResponse, boolean reregistration) {
+    this.identityResponse = identityResponse;
+    this.reregistration = reregistration;
+  }
+
+  public boolean isReregistration() {
+    return reregistration;
+  }
+}