Phase 28 (Step 2): FBS schemas + message-type constants for mail

Adds the wire schema for the eight `user.games.mail.*` ConnectRPC
commands together with the shared payload types (`MailMessage`,
`MailRecipientState`, `MailBroadcastReceipt`). Send-request tables
carry the optional `recipient_race_name` introduced in Step 1.

Drops:

- `pkg/schema/fbs/diplomail.fbs` — schema sources;
- `pkg/schema/fbs/diplomail/*.go` — generated Go bindings (flatc
  `--go --go-module-name galaxy/schema/fbs`);
- `pkg/model/diplomail/diplomail.go` — message-type catalog used by
  the gateway router;
- `ui/frontend/src/proto/galaxy/fbs/diplomail/*.ts` — generated TS
  bindings consumed by the upcoming UI client wrapper;
- `ui/Makefile` `FBS_INPUTS` extended to pick the new schema up on
  the next `make -C ui fbs-ts` run.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/Makefile

@@ -6,7 +6,7 @@ WASM_OUT    := frontend/static/core.wasm
 WASM_EXEC   := frontend/static/wasm_exec.js
 TINYGO_ROOT := $(shell tinygo env TINYGOROOT 2>/dev/null)
 FBS_OUT     := frontend/src/proto/galaxy/fbs
-FBS_INPUTS  := ../pkg/schema/fbs/common.fbs ../pkg/schema/fbs/lobby.fbs ../pkg/schema/fbs/user.fbs ../pkg/schema/fbs/report.fbs ../pkg/schema/fbs/order.fbs
+FBS_INPUTS  := ../pkg/schema/fbs/common.fbs ../pkg/schema/fbs/lobby.fbs ../pkg/schema/fbs/user.fbs ../pkg/schema/fbs/report.fbs ../pkg/schema/fbs/order.fbs ../pkg/schema/fbs/diplomail.fbs
 
 help:
 	@echo "ui targets:"

ui/frontend/src/proto/galaxy/fbs/diplomail.ts

@@ -0,0 +1,23 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+export { AdminRequest, AdminRequestT } from './diplomail/admin-request.js';
+export { AdminResponse, AdminResponseT } from './diplomail/admin-response.js';
+export { BroadcastRequest, BroadcastRequestT } from './diplomail/broadcast-request.js';
+export { BroadcastResponse, BroadcastResponseT } from './diplomail/broadcast-response.js';
+export { DeleteRequest, DeleteRequestT } from './diplomail/delete-request.js';
+export { DeleteResponse, DeleteResponseT } from './diplomail/delete-response.js';
+export { InboxRequest, InboxRequestT } from './diplomail/inbox-request.js';
+export { InboxResponse, InboxResponseT } from './diplomail/inbox-response.js';
+export { MailBroadcastReceipt, MailBroadcastReceiptT } from './diplomail/mail-broadcast-receipt.js';
+export { MailMessage, MailMessageT } from './diplomail/mail-message.js';
+export { MailRecipientState, MailRecipientStateT } from './diplomail/mail-recipient-state.js';
+export { MessageGetRequest, MessageGetRequestT } from './diplomail/message-get-request.js';
+export { MessageGetResponse, MessageGetResponseT } from './diplomail/message-get-response.js';
+export { ReadRequest, ReadRequestT } from './diplomail/read-request.js';
+export { ReadResponse, ReadResponseT } from './diplomail/read-response.js';
+export { SendRequest, SendRequestT } from './diplomail/send-request.js';
+export { SendResponse, SendResponseT } from './diplomail/send-response.js';
+export { SentRequest, SentRequestT } from './diplomail/sent-request.js';
+export { SentResponse, SentResponseT } from './diplomail/sent-response.js';

ui/frontend/src/proto/galaxy/fbs/diplomail/admin-request.ts

@@ -0,0 +1,179 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class AdminRequest implements flatbuffers.IUnpackableObject<AdminRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):AdminRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsAdminRequest(bb:flatbuffers.ByteBuffer, obj?:AdminRequest):AdminRequest {
+  return (obj || new AdminRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsAdminRequest(bb:flatbuffers.ByteBuffer, obj?:AdminRequest):AdminRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new AdminRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+target():string|null
+target(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+target(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipientUserId():string|null
+recipientUserId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientUserId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipientRaceName():string|null
+recipientRaceName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientRaceName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 10);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipients():string|null
+recipients(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipients(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 12);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+subject():string|null
+subject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+subject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 14);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+body():string|null
+body(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+body(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 16);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startAdminRequest(builder:flatbuffers.Builder) {
+  builder.startObject(7);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addTarget(builder:flatbuffers.Builder, targetOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, targetOffset, 0);
+}
+
+static addRecipientUserId(builder:flatbuffers.Builder, recipientUserIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, recipientUserIdOffset, 0);
+}
+
+static addRecipientRaceName(builder:flatbuffers.Builder, recipientRaceNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(3, recipientRaceNameOffset, 0);
+}
+
+static addRecipients(builder:flatbuffers.Builder, recipientsOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(4, recipientsOffset, 0);
+}
+
+static addSubject(builder:flatbuffers.Builder, subjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(5, subjectOffset, 0);
+}
+
+static addBody(builder:flatbuffers.Builder, bodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(6, bodyOffset, 0);
+}
+
+static endAdminRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  return offset;
+}
+
+static createAdminRequest(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset, targetOffset:flatbuffers.Offset, recipientUserIdOffset:flatbuffers.Offset, recipientRaceNameOffset:flatbuffers.Offset, recipientsOffset:flatbuffers.Offset, subjectOffset:flatbuffers.Offset, bodyOffset:flatbuffers.Offset):flatbuffers.Offset {
+  AdminRequest.startAdminRequest(builder);
+  AdminRequest.addGameId(builder, gameIdOffset);
+  AdminRequest.addTarget(builder, targetOffset);
+  AdminRequest.addRecipientUserId(builder, recipientUserIdOffset);
+  AdminRequest.addRecipientRaceName(builder, recipientRaceNameOffset);
+  AdminRequest.addRecipients(builder, recipientsOffset);
+  AdminRequest.addSubject(builder, subjectOffset);
+  AdminRequest.addBody(builder, bodyOffset);
+  return AdminRequest.endAdminRequest(builder);
+}
+
+unpack(): AdminRequestT {
+  return new AdminRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    this.target(),
+    this.recipientUserId(),
+    this.recipientRaceName(),
+    this.recipients(),
+    this.subject(),
+    this.body()
+  );
+}
+
+
+unpackTo(_o: AdminRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.target = this.target();
+  _o.recipientUserId = this.recipientUserId();
+  _o.recipientRaceName = this.recipientRaceName();
+  _o.recipients = this.recipients();
+  _o.subject = this.subject();
+  _o.body = this.body();
+}
+}
+
+export class AdminRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public target: string|Uint8Array|null = null,
+  public recipientUserId: string|Uint8Array|null = null,
+  public recipientRaceName: string|Uint8Array|null = null,
+  public recipients: string|Uint8Array|null = null,
+  public subject: string|Uint8Array|null = null,
+  public body: string|Uint8Array|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const target = (this.target !== null ? builder.createString(this.target!) : 0);
+  const recipientUserId = (this.recipientUserId !== null ? builder.createString(this.recipientUserId!) : 0);
+  const recipientRaceName = (this.recipientRaceName !== null ? builder.createString(this.recipientRaceName!) : 0);
+  const recipients = (this.recipients !== null ? builder.createString(this.recipients!) : 0);
+  const subject = (this.subject !== null ? builder.createString(this.subject!) : 0);
+  const body = (this.body !== null ? builder.createString(this.body!) : 0);
+
+  return AdminRequest.createAdminRequest(builder,
+    (this.gameId !== null ? this.gameId!.pack(builder) : 0),
+    target,
+    recipientUserId,
+    recipientRaceName,
+    recipients,
+    subject,
+    body
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/admin-response.ts

@@ -0,0 +1,88 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailBroadcastReceipt, MailBroadcastReceiptT } from '../diplomail/mail-broadcast-receipt.js';
+import { MailMessage, MailMessageT } from '../diplomail/mail-message.js';
+
+
+export class AdminResponse implements flatbuffers.IUnpackableObject<AdminResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):AdminResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsAdminResponse(bb:flatbuffers.ByteBuffer, obj?:AdminResponse):AdminResponse {
+  return (obj || new AdminResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsAdminResponse(bb:flatbuffers.ByteBuffer, obj?:AdminResponse):AdminResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new AdminResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+message(obj?:MailMessage):MailMessage|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailMessage()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+receipt(obj?:MailBroadcastReceipt):MailBroadcastReceipt|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? (obj || new MailBroadcastReceipt()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startAdminResponse(builder:flatbuffers.Builder) {
+  builder.startObject(2);
+}
+
+static addMessage(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageOffset, 0);
+}
+
+static addReceipt(builder:flatbuffers.Builder, receiptOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, receiptOffset, 0);
+}
+
+static endAdminResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+
+unpack(): AdminResponseT {
+  return new AdminResponseT(
+    (this.message() !== null ? this.message()!.unpack() : null),
+    (this.receipt() !== null ? this.receipt()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: AdminResponseT): void {
+  _o.message = (this.message() !== null ? this.message()!.unpack() : null);
+  _o.receipt = (this.receipt() !== null ? this.receipt()!.unpack() : null);
+}
+}
+
+export class AdminResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public message: MailMessageT|null = null,
+  public receipt: MailBroadcastReceiptT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const message = (this.message !== null ? this.message!.pack(builder) : 0);
+  const receipt = (this.receipt !== null ? this.receipt!.pack(builder) : 0);
+
+  AdminResponse.startAdminResponse(builder);
+  AdminResponse.addMessage(builder, message);
+  AdminResponse.addReceipt(builder, receipt);
+
+  return AdminResponse.endAdminResponse(builder);
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/broadcast-request.ts

@@ -0,0 +1,111 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class BroadcastRequest implements flatbuffers.IUnpackableObject<BroadcastRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):BroadcastRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsBroadcastRequest(bb:flatbuffers.ByteBuffer, obj?:BroadcastRequest):BroadcastRequest {
+  return (obj || new BroadcastRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsBroadcastRequest(bb:flatbuffers.ByteBuffer, obj?:BroadcastRequest):BroadcastRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new BroadcastRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+subject():string|null
+subject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+subject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+body():string|null
+body(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+body(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startBroadcastRequest(builder:flatbuffers.Builder) {
+  builder.startObject(3);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addSubject(builder:flatbuffers.Builder, subjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, subjectOffset, 0);
+}
+
+static addBody(builder:flatbuffers.Builder, bodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, bodyOffset, 0);
+}
+
+static endBroadcastRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  return offset;
+}
+
+static createBroadcastRequest(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset, subjectOffset:flatbuffers.Offset, bodyOffset:flatbuffers.Offset):flatbuffers.Offset {
+  BroadcastRequest.startBroadcastRequest(builder);
+  BroadcastRequest.addGameId(builder, gameIdOffset);
+  BroadcastRequest.addSubject(builder, subjectOffset);
+  BroadcastRequest.addBody(builder, bodyOffset);
+  return BroadcastRequest.endBroadcastRequest(builder);
+}
+
+unpack(): BroadcastRequestT {
+  return new BroadcastRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    this.subject(),
+    this.body()
+  );
+}
+
+
+unpackTo(_o: BroadcastRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.subject = this.subject();
+  _o.body = this.body();
+}
+}
+
+export class BroadcastRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public subject: string|Uint8Array|null = null,
+  public body: string|Uint8Array|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const subject = (this.subject !== null ? builder.createString(this.subject!) : 0);
+  const body = (this.body !== null ? builder.createString(this.body!) : 0);
+
+  return BroadcastRequest.createBroadcastRequest(builder,
+    (this.gameId !== null ? this.gameId!.pack(builder) : 0),
+    subject,
+    body
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/broadcast-response.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailBroadcastReceipt, MailBroadcastReceiptT } from '../diplomail/mail-broadcast-receipt.js';
+
+
+export class BroadcastResponse implements flatbuffers.IUnpackableObject<BroadcastResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):BroadcastResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsBroadcastResponse(bb:flatbuffers.ByteBuffer, obj?:BroadcastResponse):BroadcastResponse {
+  return (obj || new BroadcastResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsBroadcastResponse(bb:flatbuffers.ByteBuffer, obj?:BroadcastResponse):BroadcastResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new BroadcastResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+receipt(obj?:MailBroadcastReceipt):MailBroadcastReceipt|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailBroadcastReceipt()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startBroadcastResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addReceipt(builder:flatbuffers.Builder, receiptOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, receiptOffset, 0);
+}
+
+static endBroadcastResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createBroadcastResponse(builder:flatbuffers.Builder, receiptOffset:flatbuffers.Offset):flatbuffers.Offset {
+  BroadcastResponse.startBroadcastResponse(builder);
+  BroadcastResponse.addReceipt(builder, receiptOffset);
+  return BroadcastResponse.endBroadcastResponse(builder);
+}
+
+unpack(): BroadcastResponseT {
+  return new BroadcastResponseT(
+    (this.receipt() !== null ? this.receipt()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: BroadcastResponseT): void {
+  _o.receipt = (this.receipt() !== null ? this.receipt()!.unpack() : null);
+}
+}
+
+export class BroadcastResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public receipt: MailBroadcastReceiptT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const receipt = (this.receipt !== null ? this.receipt!.pack(builder) : 0);
+
+  return BroadcastResponse.createBroadcastResponse(builder,
+    receipt
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/delete-request.ts

@@ -0,0 +1,86 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class DeleteRequest implements flatbuffers.IUnpackableObject<DeleteRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):DeleteRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsDeleteRequest(bb:flatbuffers.ByteBuffer, obj?:DeleteRequest):DeleteRequest {
+  return (obj || new DeleteRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsDeleteRequest(bb:flatbuffers.ByteBuffer, obj?:DeleteRequest):DeleteRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new DeleteRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+messageId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+static startDeleteRequest(builder:flatbuffers.Builder) {
+  builder.startObject(2);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(1, messageIdOffset, 0);
+}
+
+static endDeleteRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  builder.requiredField(offset, 6) // message_id
+  return offset;
+}
+
+
+unpack(): DeleteRequestT {
+  return new DeleteRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    (this.messageId() !== null ? this.messageId()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: DeleteRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.messageId = (this.messageId() !== null ? this.messageId()!.unpack() : null);
+}
+}
+
+export class DeleteRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public messageId: UUIDT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  DeleteRequest.startDeleteRequest(builder);
+  DeleteRequest.addGameId(builder, (this.gameId !== null ? this.gameId!.pack(builder) : 0));
+  DeleteRequest.addMessageId(builder, (this.messageId !== null ? this.messageId!.pack(builder) : 0));
+
+  return DeleteRequest.endDeleteRequest(builder);
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/delete-response.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailRecipientState, MailRecipientStateT } from '../diplomail/mail-recipient-state.js';
+
+
+export class DeleteResponse implements flatbuffers.IUnpackableObject<DeleteResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):DeleteResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsDeleteResponse(bb:flatbuffers.ByteBuffer, obj?:DeleteResponse):DeleteResponse {
+  return (obj || new DeleteResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsDeleteResponse(bb:flatbuffers.ByteBuffer, obj?:DeleteResponse):DeleteResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new DeleteResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+state(obj?:MailRecipientState):MailRecipientState|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailRecipientState()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startDeleteResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addState(builder:flatbuffers.Builder, stateOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, stateOffset, 0);
+}
+
+static endDeleteResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createDeleteResponse(builder:flatbuffers.Builder, stateOffset:flatbuffers.Offset):flatbuffers.Offset {
+  DeleteResponse.startDeleteResponse(builder);
+  DeleteResponse.addState(builder, stateOffset);
+  return DeleteResponse.endDeleteResponse(builder);
+}
+
+unpack(): DeleteResponseT {
+  return new DeleteResponseT(
+    (this.state() !== null ? this.state()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: DeleteResponseT): void {
+  _o.state = (this.state() !== null ? this.state()!.unpack() : null);
+}
+}
+
+export class DeleteResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public state: MailRecipientStateT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const state = (this.state !== null ? this.state!.pack(builder) : 0);
+
+  return DeleteResponse.createDeleteResponse(builder,
+    state
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/inbox-request.ts

@@ -0,0 +1,76 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class InboxRequest implements flatbuffers.IUnpackableObject<InboxRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):InboxRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsInboxRequest(bb:flatbuffers.ByteBuffer, obj?:InboxRequest):InboxRequest {
+  return (obj || new InboxRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsInboxRequest(bb:flatbuffers.ByteBuffer, obj?:InboxRequest):InboxRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new InboxRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+static startInboxRequest(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static endInboxRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  return offset;
+}
+
+static createInboxRequest(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset):flatbuffers.Offset {
+  InboxRequest.startInboxRequest(builder);
+  InboxRequest.addGameId(builder, gameIdOffset);
+  return InboxRequest.endInboxRequest(builder);
+}
+
+unpack(): InboxRequestT {
+  return new InboxRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: InboxRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+}
+}
+
+export class InboxRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return InboxRequest.createInboxRequest(builder,
+    (this.gameId !== null ? this.gameId!.pack(builder) : 0)
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/inbox-response.ts

@@ -0,0 +1,94 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailMessage, MailMessageT } from '../diplomail/mail-message.js';
+
+
+export class InboxResponse implements flatbuffers.IUnpackableObject<InboxResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):InboxResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsInboxResponse(bb:flatbuffers.ByteBuffer, obj?:InboxResponse):InboxResponse {
+  return (obj || new InboxResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsInboxResponse(bb:flatbuffers.ByteBuffer, obj?:InboxResponse):InboxResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new InboxResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+items(index: number, obj?:MailMessage):MailMessage|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailMessage()).__init(this.bb!.__indirect(this.bb!.__vector(this.bb_pos + offset) + index * 4), this.bb!) : null;
+}
+
+itemsLength():number {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__vector_len(this.bb_pos + offset) : 0;
+}
+
+static startInboxResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addItems(builder:flatbuffers.Builder, itemsOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, itemsOffset, 0);
+}
+
+static createItemsVector(builder:flatbuffers.Builder, data:flatbuffers.Offset[]):flatbuffers.Offset {
+  builder.startVector(4, data.length, 4);
+  for (let i = data.length - 1; i >= 0; i--) {
+    builder.addOffset(data[i]!);
+  }
+  return builder.endVector();
+}
+
+static startItemsVector(builder:flatbuffers.Builder, numElems:number) {
+  builder.startVector(4, numElems, 4);
+}
+
+static endInboxResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createInboxResponse(builder:flatbuffers.Builder, itemsOffset:flatbuffers.Offset):flatbuffers.Offset {
+  InboxResponse.startInboxResponse(builder);
+  InboxResponse.addItems(builder, itemsOffset);
+  return InboxResponse.endInboxResponse(builder);
+}
+
+unpack(): InboxResponseT {
+  return new InboxResponseT(
+    this.bb!.createObjList<MailMessage, MailMessageT>(this.items.bind(this), this.itemsLength())
+  );
+}
+
+
+unpackTo(_o: InboxResponseT): void {
+  _o.items = this.bb!.createObjList<MailMessage, MailMessageT>(this.items.bind(this), this.itemsLength());
+}
+}
+
+export class InboxResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public items: (MailMessageT)[] = []
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const items = InboxResponse.createItemsVector(builder, builder.createObjectOffsetList(this.items));
+
+  return InboxResponse.createInboxResponse(builder,
+    items
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/mail-broadcast-receipt.ts

@@ -0,0 +1,242 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class MailBroadcastReceipt implements flatbuffers.IUnpackableObject<MailBroadcastReceiptT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):MailBroadcastReceipt {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsMailBroadcastReceipt(bb:flatbuffers.ByteBuffer, obj?:MailBroadcastReceipt):MailBroadcastReceipt {
+  return (obj || new MailBroadcastReceipt()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsMailBroadcastReceipt(bb:flatbuffers.ByteBuffer, obj?:MailBroadcastReceipt):MailBroadcastReceipt {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new MailBroadcastReceipt()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+messageId():string|null
+messageId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+messageId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+gameId():string|null
+gameId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+gameId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+gameName():string|null
+gameName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+gameName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+kind():string|null
+kind(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+kind(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 10);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+senderKind():string|null
+senderKind(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+senderKind(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 12);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+subject():string|null
+subject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+subject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 14);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+body():string|null
+body(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+body(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 16);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+bodyLang():string|null
+bodyLang(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+bodyLang(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 18);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+broadcastScope():string|null
+broadcastScope(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+broadcastScope(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 20);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+createdAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 22);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+recipientCount():number {
+  const offset = this.bb!.__offset(this.bb_pos, 24);
+  return offset ? this.bb!.readInt32(this.bb_pos + offset) : 0;
+}
+
+static startMailBroadcastReceipt(builder:flatbuffers.Builder) {
+  builder.startObject(11);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageIdOffset, 0);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, gameIdOffset, 0);
+}
+
+static addGameName(builder:flatbuffers.Builder, gameNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, gameNameOffset, 0);
+}
+
+static addKind(builder:flatbuffers.Builder, kindOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(3, kindOffset, 0);
+}
+
+static addSenderKind(builder:flatbuffers.Builder, senderKindOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(4, senderKindOffset, 0);
+}
+
+static addSubject(builder:flatbuffers.Builder, subjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(5, subjectOffset, 0);
+}
+
+static addBody(builder:flatbuffers.Builder, bodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(6, bodyOffset, 0);
+}
+
+static addBodyLang(builder:flatbuffers.Builder, bodyLangOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(7, bodyLangOffset, 0);
+}
+
+static addBroadcastScope(builder:flatbuffers.Builder, broadcastScopeOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(8, broadcastScopeOffset, 0);
+}
+
+static addCreatedAtMs(builder:flatbuffers.Builder, createdAtMs:bigint) {
+  builder.addFieldInt64(9, createdAtMs, BigInt('0'));
+}
+
+static addRecipientCount(builder:flatbuffers.Builder, recipientCount:number) {
+  builder.addFieldInt32(10, recipientCount, 0);
+}
+
+static endMailBroadcastReceipt(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createMailBroadcastReceipt(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset, gameIdOffset:flatbuffers.Offset, gameNameOffset:flatbuffers.Offset, kindOffset:flatbuffers.Offset, senderKindOffset:flatbuffers.Offset, subjectOffset:flatbuffers.Offset, bodyOffset:flatbuffers.Offset, bodyLangOffset:flatbuffers.Offset, broadcastScopeOffset:flatbuffers.Offset, createdAtMs:bigint, recipientCount:number):flatbuffers.Offset {
+  MailBroadcastReceipt.startMailBroadcastReceipt(builder);
+  MailBroadcastReceipt.addMessageId(builder, messageIdOffset);
+  MailBroadcastReceipt.addGameId(builder, gameIdOffset);
+  MailBroadcastReceipt.addGameName(builder, gameNameOffset);
+  MailBroadcastReceipt.addKind(builder, kindOffset);
+  MailBroadcastReceipt.addSenderKind(builder, senderKindOffset);
+  MailBroadcastReceipt.addSubject(builder, subjectOffset);
+  MailBroadcastReceipt.addBody(builder, bodyOffset);
+  MailBroadcastReceipt.addBodyLang(builder, bodyLangOffset);
+  MailBroadcastReceipt.addBroadcastScope(builder, broadcastScopeOffset);
+  MailBroadcastReceipt.addCreatedAtMs(builder, createdAtMs);
+  MailBroadcastReceipt.addRecipientCount(builder, recipientCount);
+  return MailBroadcastReceipt.endMailBroadcastReceipt(builder);
+}
+
+unpack(): MailBroadcastReceiptT {
+  return new MailBroadcastReceiptT(
+    this.messageId(),
+    this.gameId(),
+    this.gameName(),
+    this.kind(),
+    this.senderKind(),
+    this.subject(),
+    this.body(),
+    this.bodyLang(),
+    this.broadcastScope(),
+    this.createdAtMs(),
+    this.recipientCount()
+  );
+}
+
+
+unpackTo(_o: MailBroadcastReceiptT): void {
+  _o.messageId = this.messageId();
+  _o.gameId = this.gameId();
+  _o.gameName = this.gameName();
+  _o.kind = this.kind();
+  _o.senderKind = this.senderKind();
+  _o.subject = this.subject();
+  _o.body = this.body();
+  _o.bodyLang = this.bodyLang();
+  _o.broadcastScope = this.broadcastScope();
+  _o.createdAtMs = this.createdAtMs();
+  _o.recipientCount = this.recipientCount();
+}
+}
+
+export class MailBroadcastReceiptT implements flatbuffers.IGeneratedObject {
+constructor(
+  public messageId: string|Uint8Array|null = null,
+  public gameId: string|Uint8Array|null = null,
+  public gameName: string|Uint8Array|null = null,
+  public kind: string|Uint8Array|null = null,
+  public senderKind: string|Uint8Array|null = null,
+  public subject: string|Uint8Array|null = null,
+  public body: string|Uint8Array|null = null,
+  public bodyLang: string|Uint8Array|null = null,
+  public broadcastScope: string|Uint8Array|null = null,
+  public createdAtMs: bigint = BigInt('0'),
+  public recipientCount: number = 0
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const messageId = (this.messageId !== null ? builder.createString(this.messageId!) : 0);
+  const gameId = (this.gameId !== null ? builder.createString(this.gameId!) : 0);
+  const gameName = (this.gameName !== null ? builder.createString(this.gameName!) : 0);
+  const kind = (this.kind !== null ? builder.createString(this.kind!) : 0);
+  const senderKind = (this.senderKind !== null ? builder.createString(this.senderKind!) : 0);
+  const subject = (this.subject !== null ? builder.createString(this.subject!) : 0);
+  const body = (this.body !== null ? builder.createString(this.body!) : 0);
+  const bodyLang = (this.bodyLang !== null ? builder.createString(this.bodyLang!) : 0);
+  const broadcastScope = (this.broadcastScope !== null ? builder.createString(this.broadcastScope!) : 0);
+
+  return MailBroadcastReceipt.createMailBroadcastReceipt(builder,
+    messageId,
+    gameId,
+    gameName,
+    kind,
+    senderKind,
+    subject,
+    body,
+    bodyLang,
+    broadcastScope,
+    this.createdAtMs,
+    this.recipientCount
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/mail-message.ts

@@ -0,0 +1,426 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class MailMessage implements flatbuffers.IUnpackableObject<MailMessageT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):MailMessage {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsMailMessage(bb:flatbuffers.ByteBuffer, obj?:MailMessage):MailMessage {
+  return (obj || new MailMessage()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsMailMessage(bb:flatbuffers.ByteBuffer, obj?:MailMessage):MailMessage {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new MailMessage()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+messageId():string|null
+messageId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+messageId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+gameId():string|null
+gameId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+gameId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+gameName():string|null
+gameName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+gameName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+kind():string|null
+kind(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+kind(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 10);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+senderKind():string|null
+senderKind(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+senderKind(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 12);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+senderUserId():string|null
+senderUserId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+senderUserId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 14);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+senderUsername():string|null
+senderUsername(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+senderUsername(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 16);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+senderRaceName():string|null
+senderRaceName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+senderRaceName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 18);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+subject():string|null
+subject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+subject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 20);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+body():string|null
+body(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+body(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 22);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+bodyLang():string|null
+bodyLang(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+bodyLang(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 24);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+broadcastScope():string|null
+broadcastScope(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+broadcastScope(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 26);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+createdAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 28);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+recipientUserId():string|null
+recipientUserId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientUserId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 30);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipientUserName():string|null
+recipientUserName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientUserName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 32);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipientRaceName():string|null
+recipientRaceName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientRaceName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 34);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+readAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 36);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+deletedAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 38);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+translatedSubject():string|null
+translatedSubject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+translatedSubject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 40);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+translatedBody():string|null
+translatedBody(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+translatedBody(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 42);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+translationLang():string|null
+translationLang(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+translationLang(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 44);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+translator():string|null
+translator(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+translator(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 46);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startMailMessage(builder:flatbuffers.Builder) {
+  builder.startObject(22);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageIdOffset, 0);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, gameIdOffset, 0);
+}
+
+static addGameName(builder:flatbuffers.Builder, gameNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, gameNameOffset, 0);
+}
+
+static addKind(builder:flatbuffers.Builder, kindOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(3, kindOffset, 0);
+}
+
+static addSenderKind(builder:flatbuffers.Builder, senderKindOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(4, senderKindOffset, 0);
+}
+
+static addSenderUserId(builder:flatbuffers.Builder, senderUserIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(5, senderUserIdOffset, 0);
+}
+
+static addSenderUsername(builder:flatbuffers.Builder, senderUsernameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(6, senderUsernameOffset, 0);
+}
+
+static addSenderRaceName(builder:flatbuffers.Builder, senderRaceNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(7, senderRaceNameOffset, 0);
+}
+
+static addSubject(builder:flatbuffers.Builder, subjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(8, subjectOffset, 0);
+}
+
+static addBody(builder:flatbuffers.Builder, bodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(9, bodyOffset, 0);
+}
+
+static addBodyLang(builder:flatbuffers.Builder, bodyLangOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(10, bodyLangOffset, 0);
+}
+
+static addBroadcastScope(builder:flatbuffers.Builder, broadcastScopeOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(11, broadcastScopeOffset, 0);
+}
+
+static addCreatedAtMs(builder:flatbuffers.Builder, createdAtMs:bigint) {
+  builder.addFieldInt64(12, createdAtMs, BigInt('0'));
+}
+
+static addRecipientUserId(builder:flatbuffers.Builder, recipientUserIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(13, recipientUserIdOffset, 0);
+}
+
+static addRecipientUserName(builder:flatbuffers.Builder, recipientUserNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(14, recipientUserNameOffset, 0);
+}
+
+static addRecipientRaceName(builder:flatbuffers.Builder, recipientRaceNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(15, recipientRaceNameOffset, 0);
+}
+
+static addReadAtMs(builder:flatbuffers.Builder, readAtMs:bigint) {
+  builder.addFieldInt64(16, readAtMs, BigInt('0'));
+}
+
+static addDeletedAtMs(builder:flatbuffers.Builder, deletedAtMs:bigint) {
+  builder.addFieldInt64(17, deletedAtMs, BigInt('0'));
+}
+
+static addTranslatedSubject(builder:flatbuffers.Builder, translatedSubjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(18, translatedSubjectOffset, 0);
+}
+
+static addTranslatedBody(builder:flatbuffers.Builder, translatedBodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(19, translatedBodyOffset, 0);
+}
+
+static addTranslationLang(builder:flatbuffers.Builder, translationLangOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(20, translationLangOffset, 0);
+}
+
+static addTranslator(builder:flatbuffers.Builder, translatorOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(21, translatorOffset, 0);
+}
+
+static endMailMessage(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createMailMessage(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset, gameIdOffset:flatbuffers.Offset, gameNameOffset:flatbuffers.Offset, kindOffset:flatbuffers.Offset, senderKindOffset:flatbuffers.Offset, senderUserIdOffset:flatbuffers.Offset, senderUsernameOffset:flatbuffers.Offset, senderRaceNameOffset:flatbuffers.Offset, subjectOffset:flatbuffers.Offset, bodyOffset:flatbuffers.Offset, bodyLangOffset:flatbuffers.Offset, broadcastScopeOffset:flatbuffers.Offset, createdAtMs:bigint, recipientUserIdOffset:flatbuffers.Offset, recipientUserNameOffset:flatbuffers.Offset, recipientRaceNameOffset:flatbuffers.Offset, readAtMs:bigint, deletedAtMs:bigint, translatedSubjectOffset:flatbuffers.Offset, translatedBodyOffset:flatbuffers.Offset, translationLangOffset:flatbuffers.Offset, translatorOffset:flatbuffers.Offset):flatbuffers.Offset {
+  MailMessage.startMailMessage(builder);
+  MailMessage.addMessageId(builder, messageIdOffset);
+  MailMessage.addGameId(builder, gameIdOffset);
+  MailMessage.addGameName(builder, gameNameOffset);
+  MailMessage.addKind(builder, kindOffset);
+  MailMessage.addSenderKind(builder, senderKindOffset);
+  MailMessage.addSenderUserId(builder, senderUserIdOffset);
+  MailMessage.addSenderUsername(builder, senderUsernameOffset);
+  MailMessage.addSenderRaceName(builder, senderRaceNameOffset);
+  MailMessage.addSubject(builder, subjectOffset);
+  MailMessage.addBody(builder, bodyOffset);
+  MailMessage.addBodyLang(builder, bodyLangOffset);
+  MailMessage.addBroadcastScope(builder, broadcastScopeOffset);
+  MailMessage.addCreatedAtMs(builder, createdAtMs);
+  MailMessage.addRecipientUserId(builder, recipientUserIdOffset);
+  MailMessage.addRecipientUserName(builder, recipientUserNameOffset);
+  MailMessage.addRecipientRaceName(builder, recipientRaceNameOffset);
+  MailMessage.addReadAtMs(builder, readAtMs);
+  MailMessage.addDeletedAtMs(builder, deletedAtMs);
+  MailMessage.addTranslatedSubject(builder, translatedSubjectOffset);
+  MailMessage.addTranslatedBody(builder, translatedBodyOffset);
+  MailMessage.addTranslationLang(builder, translationLangOffset);
+  MailMessage.addTranslator(builder, translatorOffset);
+  return MailMessage.endMailMessage(builder);
+}
+
+unpack(): MailMessageT {
+  return new MailMessageT(
+    this.messageId(),
+    this.gameId(),
+    this.gameName(),
+    this.kind(),
+    this.senderKind(),
+    this.senderUserId(),
+    this.senderUsername(),
+    this.senderRaceName(),
+    this.subject(),
+    this.body(),
+    this.bodyLang(),
+    this.broadcastScope(),
+    this.createdAtMs(),
+    this.recipientUserId(),
+    this.recipientUserName(),
+    this.recipientRaceName(),
+    this.readAtMs(),
+    this.deletedAtMs(),
+    this.translatedSubject(),
+    this.translatedBody(),
+    this.translationLang(),
+    this.translator()
+  );
+}
+
+
+unpackTo(_o: MailMessageT): void {
+  _o.messageId = this.messageId();
+  _o.gameId = this.gameId();
+  _o.gameName = this.gameName();
+  _o.kind = this.kind();
+  _o.senderKind = this.senderKind();
+  _o.senderUserId = this.senderUserId();
+  _o.senderUsername = this.senderUsername();
+  _o.senderRaceName = this.senderRaceName();
+  _o.subject = this.subject();
+  _o.body = this.body();
+  _o.bodyLang = this.bodyLang();
+  _o.broadcastScope = this.broadcastScope();
+  _o.createdAtMs = this.createdAtMs();
+  _o.recipientUserId = this.recipientUserId();
+  _o.recipientUserName = this.recipientUserName();
+  _o.recipientRaceName = this.recipientRaceName();
+  _o.readAtMs = this.readAtMs();
+  _o.deletedAtMs = this.deletedAtMs();
+  _o.translatedSubject = this.translatedSubject();
+  _o.translatedBody = this.translatedBody();
+  _o.translationLang = this.translationLang();
+  _o.translator = this.translator();
+}
+}
+
+export class MailMessageT implements flatbuffers.IGeneratedObject {
+constructor(
+  public messageId: string|Uint8Array|null = null,
+  public gameId: string|Uint8Array|null = null,
+  public gameName: string|Uint8Array|null = null,
+  public kind: string|Uint8Array|null = null,
+  public senderKind: string|Uint8Array|null = null,
+  public senderUserId: string|Uint8Array|null = null,
+  public senderUsername: string|Uint8Array|null = null,
+  public senderRaceName: string|Uint8Array|null = null,
+  public subject: string|Uint8Array|null = null,
+  public body: string|Uint8Array|null = null,
+  public bodyLang: string|Uint8Array|null = null,
+  public broadcastScope: string|Uint8Array|null = null,
+  public createdAtMs: bigint = BigInt('0'),
+  public recipientUserId: string|Uint8Array|null = null,
+  public recipientUserName: string|Uint8Array|null = null,
+  public recipientRaceName: string|Uint8Array|null = null,
+  public readAtMs: bigint = BigInt('0'),
+  public deletedAtMs: bigint = BigInt('0'),
+  public translatedSubject: string|Uint8Array|null = null,
+  public translatedBody: string|Uint8Array|null = null,
+  public translationLang: string|Uint8Array|null = null,
+  public translator: string|Uint8Array|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const messageId = (this.messageId !== null ? builder.createString(this.messageId!) : 0);
+  const gameId = (this.gameId !== null ? builder.createString(this.gameId!) : 0);
+  const gameName = (this.gameName !== null ? builder.createString(this.gameName!) : 0);
+  const kind = (this.kind !== null ? builder.createString(this.kind!) : 0);
+  const senderKind = (this.senderKind !== null ? builder.createString(this.senderKind!) : 0);
+  const senderUserId = (this.senderUserId !== null ? builder.createString(this.senderUserId!) : 0);
+  const senderUsername = (this.senderUsername !== null ? builder.createString(this.senderUsername!) : 0);
+  const senderRaceName = (this.senderRaceName !== null ? builder.createString(this.senderRaceName!) : 0);
+  const subject = (this.subject !== null ? builder.createString(this.subject!) : 0);
+  const body = (this.body !== null ? builder.createString(this.body!) : 0);
+  const bodyLang = (this.bodyLang !== null ? builder.createString(this.bodyLang!) : 0);
+  const broadcastScope = (this.broadcastScope !== null ? builder.createString(this.broadcastScope!) : 0);
+  const recipientUserId = (this.recipientUserId !== null ? builder.createString(this.recipientUserId!) : 0);
+  const recipientUserName = (this.recipientUserName !== null ? builder.createString(this.recipientUserName!) : 0);
+  const recipientRaceName = (this.recipientRaceName !== null ? builder.createString(this.recipientRaceName!) : 0);
+  const translatedSubject = (this.translatedSubject !== null ? builder.createString(this.translatedSubject!) : 0);
+  const translatedBody = (this.translatedBody !== null ? builder.createString(this.translatedBody!) : 0);
+  const translationLang = (this.translationLang !== null ? builder.createString(this.translationLang!) : 0);
+  const translator = (this.translator !== null ? builder.createString(this.translator!) : 0);
+
+  return MailMessage.createMailMessage(builder,
+    messageId,
+    gameId,
+    gameName,
+    kind,
+    senderKind,
+    senderUserId,
+    senderUsername,
+    senderRaceName,
+    subject,
+    body,
+    bodyLang,
+    broadcastScope,
+    this.createdAtMs,
+    recipientUserId,
+    recipientUserName,
+    recipientRaceName,
+    this.readAtMs,
+    this.deletedAtMs,
+    translatedSubject,
+    translatedBody,
+    translationLang,
+    translator
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/mail-recipient-state.ts

@@ -0,0 +1,106 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class MailRecipientState implements flatbuffers.IUnpackableObject<MailRecipientStateT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):MailRecipientState {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsMailRecipientState(bb:flatbuffers.ByteBuffer, obj?:MailRecipientState):MailRecipientState {
+  return (obj || new MailRecipientState()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsMailRecipientState(bb:flatbuffers.ByteBuffer, obj?:MailRecipientState):MailRecipientState {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new MailRecipientState()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+messageId():string|null
+messageId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+messageId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+readAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+deletedAtMs():bigint {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.readInt64(this.bb_pos + offset) : BigInt('0');
+}
+
+static startMailRecipientState(builder:flatbuffers.Builder) {
+  builder.startObject(3);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageIdOffset, 0);
+}
+
+static addReadAtMs(builder:flatbuffers.Builder, readAtMs:bigint) {
+  builder.addFieldInt64(1, readAtMs, BigInt('0'));
+}
+
+static addDeletedAtMs(builder:flatbuffers.Builder, deletedAtMs:bigint) {
+  builder.addFieldInt64(2, deletedAtMs, BigInt('0'));
+}
+
+static endMailRecipientState(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createMailRecipientState(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset, readAtMs:bigint, deletedAtMs:bigint):flatbuffers.Offset {
+  MailRecipientState.startMailRecipientState(builder);
+  MailRecipientState.addMessageId(builder, messageIdOffset);
+  MailRecipientState.addReadAtMs(builder, readAtMs);
+  MailRecipientState.addDeletedAtMs(builder, deletedAtMs);
+  return MailRecipientState.endMailRecipientState(builder);
+}
+
+unpack(): MailRecipientStateT {
+  return new MailRecipientStateT(
+    this.messageId(),
+    this.readAtMs(),
+    this.deletedAtMs()
+  );
+}
+
+
+unpackTo(_o: MailRecipientStateT): void {
+  _o.messageId = this.messageId();
+  _o.readAtMs = this.readAtMs();
+  _o.deletedAtMs = this.deletedAtMs();
+}
+}
+
+export class MailRecipientStateT implements flatbuffers.IGeneratedObject {
+constructor(
+  public messageId: string|Uint8Array|null = null,
+  public readAtMs: bigint = BigInt('0'),
+  public deletedAtMs: bigint = BigInt('0')
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const messageId = (this.messageId !== null ? builder.createString(this.messageId!) : 0);
+
+  return MailRecipientState.createMailRecipientState(builder,
+    messageId,
+    this.readAtMs,
+    this.deletedAtMs
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/message-get-request.ts

@@ -0,0 +1,86 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class MessageGetRequest implements flatbuffers.IUnpackableObject<MessageGetRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):MessageGetRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsMessageGetRequest(bb:flatbuffers.ByteBuffer, obj?:MessageGetRequest):MessageGetRequest {
+  return (obj || new MessageGetRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsMessageGetRequest(bb:flatbuffers.ByteBuffer, obj?:MessageGetRequest):MessageGetRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new MessageGetRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+messageId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+static startMessageGetRequest(builder:flatbuffers.Builder) {
+  builder.startObject(2);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(1, messageIdOffset, 0);
+}
+
+static endMessageGetRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  builder.requiredField(offset, 6) // message_id
+  return offset;
+}
+
+
+unpack(): MessageGetRequestT {
+  return new MessageGetRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    (this.messageId() !== null ? this.messageId()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: MessageGetRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.messageId = (this.messageId() !== null ? this.messageId()!.unpack() : null);
+}
+}
+
+export class MessageGetRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public messageId: UUIDT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  MessageGetRequest.startMessageGetRequest(builder);
+  MessageGetRequest.addGameId(builder, (this.gameId !== null ? this.gameId!.pack(builder) : 0));
+  MessageGetRequest.addMessageId(builder, (this.messageId !== null ? this.messageId!.pack(builder) : 0));
+
+  return MessageGetRequest.endMessageGetRequest(builder);
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/message-get-response.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailMessage, MailMessageT } from '../diplomail/mail-message.js';
+
+
+export class MessageGetResponse implements flatbuffers.IUnpackableObject<MessageGetResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):MessageGetResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsMessageGetResponse(bb:flatbuffers.ByteBuffer, obj?:MessageGetResponse):MessageGetResponse {
+  return (obj || new MessageGetResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsMessageGetResponse(bb:flatbuffers.ByteBuffer, obj?:MessageGetResponse):MessageGetResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new MessageGetResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+message(obj?:MailMessage):MailMessage|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailMessage()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startMessageGetResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addMessage(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageOffset, 0);
+}
+
+static endMessageGetResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createMessageGetResponse(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset):flatbuffers.Offset {
+  MessageGetResponse.startMessageGetResponse(builder);
+  MessageGetResponse.addMessage(builder, messageOffset);
+  return MessageGetResponse.endMessageGetResponse(builder);
+}
+
+unpack(): MessageGetResponseT {
+  return new MessageGetResponseT(
+    (this.message() !== null ? this.message()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: MessageGetResponseT): void {
+  _o.message = (this.message() !== null ? this.message()!.unpack() : null);
+}
+}
+
+export class MessageGetResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public message: MailMessageT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const message = (this.message !== null ? this.message!.pack(builder) : 0);
+
+  return MessageGetResponse.createMessageGetResponse(builder,
+    message
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/read-request.ts

@@ -0,0 +1,86 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class ReadRequest implements flatbuffers.IUnpackableObject<ReadRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):ReadRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsReadRequest(bb:flatbuffers.ByteBuffer, obj?:ReadRequest):ReadRequest {
+  return (obj || new ReadRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsReadRequest(bb:flatbuffers.ByteBuffer, obj?:ReadRequest):ReadRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new ReadRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+messageId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+static startReadRequest(builder:flatbuffers.Builder) {
+  builder.startObject(2);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addMessageId(builder:flatbuffers.Builder, messageIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(1, messageIdOffset, 0);
+}
+
+static endReadRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  builder.requiredField(offset, 6) // message_id
+  return offset;
+}
+
+
+unpack(): ReadRequestT {
+  return new ReadRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    (this.messageId() !== null ? this.messageId()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: ReadRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.messageId = (this.messageId() !== null ? this.messageId()!.unpack() : null);
+}
+}
+
+export class ReadRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public messageId: UUIDT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  ReadRequest.startReadRequest(builder);
+  ReadRequest.addGameId(builder, (this.gameId !== null ? this.gameId!.pack(builder) : 0));
+  ReadRequest.addMessageId(builder, (this.messageId !== null ? this.messageId!.pack(builder) : 0));
+
+  return ReadRequest.endReadRequest(builder);
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/read-response.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailRecipientState, MailRecipientStateT } from '../diplomail/mail-recipient-state.js';
+
+
+export class ReadResponse implements flatbuffers.IUnpackableObject<ReadResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):ReadResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsReadResponse(bb:flatbuffers.ByteBuffer, obj?:ReadResponse):ReadResponse {
+  return (obj || new ReadResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsReadResponse(bb:flatbuffers.ByteBuffer, obj?:ReadResponse):ReadResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new ReadResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+state(obj?:MailRecipientState):MailRecipientState|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailRecipientState()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startReadResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addState(builder:flatbuffers.Builder, stateOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, stateOffset, 0);
+}
+
+static endReadResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createReadResponse(builder:flatbuffers.Builder, stateOffset:flatbuffers.Offset):flatbuffers.Offset {
+  ReadResponse.startReadResponse(builder);
+  ReadResponse.addState(builder, stateOffset);
+  return ReadResponse.endReadResponse(builder);
+}
+
+unpack(): ReadResponseT {
+  return new ReadResponseT(
+    (this.state() !== null ? this.state()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: ReadResponseT): void {
+  _o.state = (this.state() !== null ? this.state()!.unpack() : null);
+}
+}
+
+export class ReadResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public state: MailRecipientStateT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const state = (this.state !== null ? this.state!.pack(builder) : 0);
+
+  return ReadResponse.createReadResponse(builder,
+    state
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/send-request.ts

@@ -0,0 +1,145 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class SendRequest implements flatbuffers.IUnpackableObject<SendRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):SendRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsSendRequest(bb:flatbuffers.ByteBuffer, obj?:SendRequest):SendRequest {
+  return (obj || new SendRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsSendRequest(bb:flatbuffers.ByteBuffer, obj?:SendRequest):SendRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new SendRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+recipientUserId():string|null
+recipientUserId(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientUserId(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+recipientRaceName():string|null
+recipientRaceName(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+recipientRaceName(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+subject():string|null
+subject(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+subject(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 10);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+body():string|null
+body(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+body(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 12);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startSendRequest(builder:flatbuffers.Builder) {
+  builder.startObject(5);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static addRecipientUserId(builder:flatbuffers.Builder, recipientUserIdOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, recipientUserIdOffset, 0);
+}
+
+static addRecipientRaceName(builder:flatbuffers.Builder, recipientRaceNameOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, recipientRaceNameOffset, 0);
+}
+
+static addSubject(builder:flatbuffers.Builder, subjectOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(3, subjectOffset, 0);
+}
+
+static addBody(builder:flatbuffers.Builder, bodyOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(4, bodyOffset, 0);
+}
+
+static endSendRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  return offset;
+}
+
+static createSendRequest(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset, recipientUserIdOffset:flatbuffers.Offset, recipientRaceNameOffset:flatbuffers.Offset, subjectOffset:flatbuffers.Offset, bodyOffset:flatbuffers.Offset):flatbuffers.Offset {
+  SendRequest.startSendRequest(builder);
+  SendRequest.addGameId(builder, gameIdOffset);
+  SendRequest.addRecipientUserId(builder, recipientUserIdOffset);
+  SendRequest.addRecipientRaceName(builder, recipientRaceNameOffset);
+  SendRequest.addSubject(builder, subjectOffset);
+  SendRequest.addBody(builder, bodyOffset);
+  return SendRequest.endSendRequest(builder);
+}
+
+unpack(): SendRequestT {
+  return new SendRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null),
+    this.recipientUserId(),
+    this.recipientRaceName(),
+    this.subject(),
+    this.body()
+  );
+}
+
+
+unpackTo(_o: SendRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+  _o.recipientUserId = this.recipientUserId();
+  _o.recipientRaceName = this.recipientRaceName();
+  _o.subject = this.subject();
+  _o.body = this.body();
+}
+}
+
+export class SendRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null,
+  public recipientUserId: string|Uint8Array|null = null,
+  public recipientRaceName: string|Uint8Array|null = null,
+  public subject: string|Uint8Array|null = null,
+  public body: string|Uint8Array|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const recipientUserId = (this.recipientUserId !== null ? builder.createString(this.recipientUserId!) : 0);
+  const recipientRaceName = (this.recipientRaceName !== null ? builder.createString(this.recipientRaceName!) : 0);
+  const subject = (this.subject !== null ? builder.createString(this.subject!) : 0);
+  const body = (this.body !== null ? builder.createString(this.body!) : 0);
+
+  return SendRequest.createSendRequest(builder,
+    (this.gameId !== null ? this.gameId!.pack(builder) : 0),
+    recipientUserId,
+    recipientRaceName,
+    subject,
+    body
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/send-response.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailMessage, MailMessageT } from '../diplomail/mail-message.js';
+
+
+export class SendResponse implements flatbuffers.IUnpackableObject<SendResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):SendResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsSendResponse(bb:flatbuffers.ByteBuffer, obj?:SendResponse):SendResponse {
+  return (obj || new SendResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsSendResponse(bb:flatbuffers.ByteBuffer, obj?:SendResponse):SendResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new SendResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+message(obj?:MailMessage):MailMessage|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailMessage()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startSendResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addMessage(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, messageOffset, 0);
+}
+
+static endSendResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createSendResponse(builder:flatbuffers.Builder, messageOffset:flatbuffers.Offset):flatbuffers.Offset {
+  SendResponse.startSendResponse(builder);
+  SendResponse.addMessage(builder, messageOffset);
+  return SendResponse.endSendResponse(builder);
+}
+
+unpack(): SendResponseT {
+  return new SendResponseT(
+    (this.message() !== null ? this.message()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: SendResponseT): void {
+  _o.message = (this.message() !== null ? this.message()!.unpack() : null);
+}
+}
+
+export class SendResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public message: MailMessageT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const message = (this.message !== null ? this.message!.pack(builder) : 0);
+
+  return SendResponse.createSendResponse(builder,
+    message
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/sent-request.ts

@@ -0,0 +1,76 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { UUID, UUIDT } from '../common/uuid.js';
+
+
+export class SentRequest implements flatbuffers.IUnpackableObject<SentRequestT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):SentRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsSentRequest(bb:flatbuffers.ByteBuffer, obj?:SentRequest):SentRequest {
+  return (obj || new SentRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsSentRequest(bb:flatbuffers.ByteBuffer, obj?:SentRequest):SentRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new SentRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+gameId(obj?:UUID):UUID|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new UUID()).__init(this.bb_pos + offset, this.bb!) : null;
+}
+
+static startSentRequest(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addGameId(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset) {
+  builder.addFieldStruct(0, gameIdOffset, 0);
+}
+
+static endSentRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  builder.requiredField(offset, 4) // game_id
+  return offset;
+}
+
+static createSentRequest(builder:flatbuffers.Builder, gameIdOffset:flatbuffers.Offset):flatbuffers.Offset {
+  SentRequest.startSentRequest(builder);
+  SentRequest.addGameId(builder, gameIdOffset);
+  return SentRequest.endSentRequest(builder);
+}
+
+unpack(): SentRequestT {
+  return new SentRequestT(
+    (this.gameId() !== null ? this.gameId()!.unpack() : null)
+  );
+}
+
+
+unpackTo(_o: SentRequestT): void {
+  _o.gameId = (this.gameId() !== null ? this.gameId()!.unpack() : null);
+}
+}
+
+export class SentRequestT implements flatbuffers.IGeneratedObject {
+constructor(
+  public gameId: UUIDT|null = null
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return SentRequest.createSentRequest(builder,
+    (this.gameId !== null ? this.gameId!.pack(builder) : 0)
+  );
+}
+}

ui/frontend/src/proto/galaxy/fbs/diplomail/sent-response.ts

@@ -0,0 +1,94 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+import { MailMessage, MailMessageT } from '../diplomail/mail-message.js';
+
+
+export class SentResponse implements flatbuffers.IUnpackableObject<SentResponseT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):SentResponse {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsSentResponse(bb:flatbuffers.ByteBuffer, obj?:SentResponse):SentResponse {
+  return (obj || new SentResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsSentResponse(bb:flatbuffers.ByteBuffer, obj?:SentResponse):SentResponse {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new SentResponse()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+items(index: number, obj?:MailMessage):MailMessage|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? (obj || new MailMessage()).__init(this.bb!.__indirect(this.bb!.__vector(this.bb_pos + offset) + index * 4), this.bb!) : null;
+}
+
+itemsLength():number {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__vector_len(this.bb_pos + offset) : 0;
+}
+
+static startSentResponse(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addItems(builder:flatbuffers.Builder, itemsOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, itemsOffset, 0);
+}
+
+static createItemsVector(builder:flatbuffers.Builder, data:flatbuffers.Offset[]):flatbuffers.Offset {
+  builder.startVector(4, data.length, 4);
+  for (let i = data.length - 1; i >= 0; i--) {
+    builder.addOffset(data[i]!);
+  }
+  return builder.endVector();
+}
+
+static startItemsVector(builder:flatbuffers.Builder, numElems:number) {
+  builder.startVector(4, numElems, 4);
+}
+
+static endSentResponse(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createSentResponse(builder:flatbuffers.Builder, itemsOffset:flatbuffers.Offset):flatbuffers.Offset {
+  SentResponse.startSentResponse(builder);
+  SentResponse.addItems(builder, itemsOffset);
+  return SentResponse.endSentResponse(builder);
+}
+
+unpack(): SentResponseT {
+  return new SentResponseT(
+    this.bb!.createObjList<MailMessage, MailMessageT>(this.items.bind(this), this.itemsLength())
+  );
+}
+
+
+unpackTo(_o: SentResponseT): void {
+  _o.items = this.bb!.createObjList<MailMessage, MailMessageT>(this.items.bind(this), this.itemsLength());
+}
+}
+
+export class SentResponseT implements flatbuffers.IGeneratedObject {
+constructor(
+  public items: (MailMessageT)[] = []
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  const items = SentResponse.createItemsVector(builder, builder.createObjectOffsetList(this.items));
+
+  return SentResponse.createSentResponse(builder,
+    items
+  );
+}
+}