test(federation-identity): #1 leave mode — registry cleaned, remote untouched, no S2S call

Also fix dbInspect.ts UserRow column aliases: SELECT * returns snake_case
columns (is_deleted, display_name, etc.) but UserRow expected camelCase.
Switch to explicit aliased SELECT so all callers get the documented interface.

packages/server/test/federation-identity-deletion.test.ts

@@ -46,4 +46,51 @@ describe('Federation identity deletion — server suite', () => {
     const body = await res.json();
     expect(String(body.error)).toMatch(/origins/);
   });
+
+  it('#1 leave mode: home registry cleaned, remote untouched, no S2S request hits the remote', async () => {
+    const { createFederatedUser } = await import('./helpers/testUsers.js');
+    const { openInspector } = await import('./helpers/dbInspect.js');
+    const { logMatched } = await import('./helpers/twoInstanceHarness.js');
+    const { homeUser, remoteUser } = await createFederatedUser(harness.home, harness.remote, 't1');
+
+    // Snapshot remote user pre-delete
+    const remoteInspect = openInspector(harness.remote);
+    const before = remoteInspect.user(remoteUser.id);
+    expect(before).toBeTruthy();
+    expect(before!.isDeleted).toBe(0);
+    remoteInspect.close();
+
+    const res = await fetch(`${harness.home.origin}/api/users/@me/federation-identity/delete`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${homeUser.token}` },
+      body: JSON.stringify({ origins: [harness.remote.origin], mode: 'leave' }),
+    });
+    expect(res.status).toBe(200);
+    const body = await res.json();
+    expect(body.results[harness.remote.origin]).toEqual({ success: true });
+
+    // CRITICAL: prove no S2S call hit the remote. Fastify access logs include the
+    // request path; if `/api/federation/identity` appears at all in remote.log
+    // after the call, leave mode incorrectly fired an S2S request.
+    const sawS2S = await logMatched(harness.remote, /\/api\/federation\/identity/, 1_000);
+    expect(sawS2S).toBe(false);
+
+    // Belt-and-suspenders: remote user row UNCHANGED in every column
+    const remoteAfter = openInspector(harness.remote);
+    const after = remoteAfter.user(remoteUser.id);
+    expect(after).toMatchObject({
+      id: before!.id,
+      username: before!.username,
+      isDeleted: 0,
+      displayName: before!.displayName,
+    });
+    remoteAfter.close();
+
+    // Home registry row gone, replicatedInstances trimmed
+    const homeInspect = openInspector(harness.home);
+    expect(homeInspect.registryRow(homeUser.id, harness.remote.origin)).toBeUndefined();
+    const replInst = homeInspect.replicatedInstancesArray(homeUser.id);
+    expect(replInst.find(r => r.origin === harness.remote.origin)).toBeUndefined();
+    homeInspect.close();
+  });
 });

packages/server/test/helpers/dbInspect.ts

@@ -38,8 +38,38 @@ export function openInspector(instance: SpawnedInstance): DbInspector {
   const db = new Database(instance.dbPath, { readonly: true, fileMustExist: true });
   db.pragma('journal_mode = WAL');
   return {
-    user: (uid) => db.prepare('SELECT * FROM users WHERE id = ?').get(uid) as UserRow | null,
-    userByUsername: (u) => db.prepare('SELECT * FROM users WHERE username = ?').get(u) as UserRow | null,
+    user: (uid) => db.prepare(`
+      SELECT id, username,
+        password_hash AS passwordHash,
+        display_name AS displayName,
+        avatar, banner, bio,
+        custom_status AS customStatus,
+        accent_color AS accentColor,
+        avatar_color AS avatarColor,
+        replicated_instances AS replicatedInstances,
+        is_deleted AS isDeleted,
+        status,
+        is_admin AS isAdmin,
+        home_instance AS homeInstance,
+        home_user_id AS homeUserId
+      FROM users WHERE id = ?
+    `).get(uid) as UserRow | null,
+    userByUsername: (u) => db.prepare(`
+      SELECT id, username,
+        password_hash AS passwordHash,
+        display_name AS displayName,
+        avatar, banner, bio,
+        custom_status AS customStatus,
+        accent_color AS accentColor,
+        avatar_color AS avatarColor,
+        replicated_instances AS replicatedInstances,
+        is_deleted AS isDeleted,
+        status,
+        is_admin AS isAdmin,
+        home_instance AS homeInstance,
+        home_user_id AS homeUserId
+      FROM users WHERE username = ?
+    `).get(u) as UserRow | null,
     spaceMembersForUser: (uid) =>
       db.prepare('SELECT space_id AS spaceId, user_id AS userId FROM space_members WHERE user_id = ?').all(uid) as { spaceId: string; userId: string }[],
     reactionsForUser: (uid) =>