feat(federation): capture dm_close/reopen/read_state/profile/file_rejected in mutation log

Four event types previously bypassed appendMutationLog, making
them unrecoverable via /api/federation/sync after peer inactivity:
  - queueDmCloseRelay (dm_close, dm_reopen)
  - queueReadStateRelay (read_state_update)
  - handleSizeRejection in federationWorker (file_rejected)
  - profile PATCH route (profile_update) — two call sites,
    one appendMutationLog per profile change (not per target origin)

The /api/federation/sync response builder is extended to
serialize these event types in the next task.

packages/server/src/utils/federationOutbox.mutationlog.test.ts

@@ -0,0 +1,135 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import Database from 'better-sqlite3';
+import { drizzle } from 'drizzle-orm/better-sqlite3';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import * as schema from '../db/schema.js';
+import { eq } from 'drizzle-orm';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+type TestDb = ReturnType<typeof drizzle<typeof schema>>;
+let sqlite: Database.Database;
+let testDb: TestDb;
+
+vi.mock('../db/index.js', () => ({
+  getDb: () => testDb,
+  schema,
+}));
+
+vi.mock('../utils/federationAuth.js', () => ({
+  getOurOrigin: () => 'https://test.example',
+  buildFederationHeaders: () => ({}),
+  generateHmacSecret: () => 'secret',
+}));
+
+let _snowflakeCounter = 1;
+vi.mock('../utils/snowflake.js', () => ({
+  generateSnowflake: () => String(_snowflakeCounter++),
+  setWorkerId: vi.fn(),
+}));
+
+function applyMigrations(db: Database.Database): void {
+  const migrationsDir = path.resolve(__dirname, '../../drizzle');
+  const files = fs.readdirSync(migrationsDir).filter(f => f.endsWith('.sql')).sort();
+  for (const f of files) {
+    const sql = fs.readFileSync(path.join(migrationsDir, f), 'utf8');
+    const statements = sql.split(/-->\s*statement-breakpoint/);
+    for (const stmt of statements) {
+      const clean = stmt.trim();
+      if (clean) db.exec(clean);
+    }
+  }
+}
+
+function seedSettings(): void {
+  testDb.insert(schema.instanceSettings).values({
+    id: 1,
+    federationRelayEnabled: 1,
+    updatedAt: Date.now(),
+  }).run();
+}
+
+function seedChannel(id: string, federatedId: string | null): void {
+  testDb.insert(schema.dmChannels).values({
+    id, federatedId, ownerId: null, createdAt: Date.now(),
+  }).run();
+}
+
+function seedUser(id: string, username: string): void {
+  testDb.insert(schema.users).values({
+    id, username, displayName: username, passwordHash: 'x',
+    createdAt: Date.now(),
+  }).run();
+}
+
+function seedDmMember(channelId: string, userId: string): void {
+  testDb.insert(schema.dmMembers).values({
+    dmChannelId: channelId, userId, closed: 0,
+  }).run();
+}
+
+describe('queueDmCloseRelay — mutation log capture', () => {
+  beforeEach(() => {
+    sqlite = new Database(':memory:');
+    testDb = drizzle(sqlite, { schema });
+    applyMigrations(sqlite);
+    seedSettings();
+  });
+
+  it('appends a mutation log row for dm_close', async () => {
+    const { queueDmCloseRelay } = await import('./federationOutbox.js');
+    seedUser('u-1', 'alice');
+    seedChannel('ch-1', 'fed-1');
+    seedDmMember('ch-1', 'u-1');
+
+    queueDmCloseRelay('ch-1', 'u-1', 'dm_close');
+
+    const rows = testDb.select().from(schema.federationMutationLog)
+      .where(eq(schema.federationMutationLog.mutationType, 'dm_close')).all();
+    expect(rows.length).toBe(1);
+    expect(rows[0]?.contextId).toBe('ch-1');
+    expect(rows[0]?.contextType).toBe('dm');
+  });
+
+  it('appends a mutation log row for dm_reopen', async () => {
+    const { queueDmCloseRelay } = await import('./federationOutbox.js');
+    seedUser('u-1', 'alice');
+    seedChannel('ch-2', 'fed-2');
+    seedDmMember('ch-2', 'u-1');
+
+    queueDmCloseRelay('ch-2', 'u-1', 'dm_reopen');
+
+    const rows = testDb.select().from(schema.federationMutationLog)
+      .where(eq(schema.federationMutationLog.mutationType, 'dm_reopen')).all();
+    expect(rows.length).toBe(1);
+  });
+});
+
+describe('queueReadStateRelay — mutation log capture', () => {
+  beforeEach(() => {
+    sqlite = new Database(':memory:');
+    testDb = drizzle(sqlite, { schema });
+    applyMigrations(sqlite);
+    seedSettings();
+  });
+
+  it('appends a mutation log row for read_state_update', async () => {
+    const { queueReadStateRelay } = await import('./federationOutbox.js');
+    seedUser('u-2', 'bob');
+    seedChannel('ch-3', 'fed-3');
+    seedDmMember('ch-3', 'u-2');
+    testDb.insert(schema.dmMessages).values({
+      id: 'm-1', dmChannelId: 'ch-3', userId: 'u-2', content: 'hi',
+      type: 'user', createdAt: Date.now(),
+    }).run();
+
+    queueReadStateRelay('ch-3', 'm-1', 'u-2');
+
+    const rows = testDb.select().from(schema.federationMutationLog)
+      .where(eq(schema.federationMutationLog.mutationType, 'read_state_update')).all();
+    expect(rows.length).toBe(1);
+    expect(rows[0]?.contextId).toBe('ch-3');
+    expect(rows[0]?.contextType).toBe('dm');
+  });
+});

packages/server/src/utils/federationOutbox.ts

@@ -700,6 +700,12 @@ export function queueReadStateRelay(
   };
 
   const targetOrigins = getGroupDmTargetOrigins(channelId);
+  appendMutationLog(
+    `read_state:${channel.federatedId}:${userId}`,
+    channelId,
+    'read_state_update',
+    JSON.stringify({ user: { homeUserId, homeInstance }, messageRef }),
+  );
   queueOutboxEvent(
     `read_state:${channel.federatedId}:${userId}`,
     channelId,
@@ -755,6 +761,12 @@ export function queueDmCloseRelay(
   };
 
   const targetOrigins = getGroupDmTargetOrigins(dmChannelId);
+  appendMutationLog(
+    `${eventType}:${channel.federatedId}:${userId}`,
+    dmChannelId,
+    eventType,
+    JSON.stringify({ homeUserId, homeInstance }),
+  );
   queueOutboxEvent(
     `${eventType}:${channel.federatedId}:${userId}`,
     dmChannelId,

packages/server/src/utils/federationWorker.ts

@@ -2,7 +2,7 @@ import { getDb } from '../db/index.js';
 import * as schema from '../db/schema.js';
 import { eq, and, lte, asc, inArray, sql } from 'drizzle-orm';
 import { config } from '../config.js';
-import { isFederationRelayEnabled, queueOutboxEvent } from './federationOutbox.js';
+import { isFederationRelayEnabled, queueOutboxEvent, appendMutationLog } from './federationOutbox.js';
 import { runFederationJanitor } from './storageJanitor.js';
 import { buildFederationHeaders, getOurOrigin, generateHmacSecret, ROTATION_GRACE_PERIOD_MS } from './federationAuth.js';
 import { evaluateAuthFailure, AUTH_FAILURE_THRESHOLD } from './federationAuthFailure.js';
@@ -703,6 +703,18 @@ function handleSizeRejection(
     affectedUserIds,
   };
 
+  appendMutationLog(
+    localMsg.sourceMessageId,
+    localMsg.dmChannelId,
+    'file_rejected',
+    JSON.stringify({
+      attachmentId: att?.id ?? entry.sourceUrl,
+      sourceFilename,
+      rejectionReason: 'size_limit_exceeded',
+      rejectionLimit: maxUploadSize,
+      affectedUserIds,
+    }),
+  );
   queueOutboxEvent(
     localMsg.sourceMessageId,
     localMsg.dmChannelId,