diff --git a/internal/app/channels/service_test.go b/internal/app/channels/service_test.go
index 12cd65cc..5fa62a05 100644
--- a/internal/app/channels/service_test.go
+++ b/internal/app/channels/service_test.go
@@ -2761,61 +2761,6 @@ func TestChannelUsernameAndSignatures(t *testing.T) {
 	}
 }
 
-func TestUpdateUsernameForcesPreHistoryVisible(t *testing.T) {
-	ctx := context.Background()
-	const ownerID int64 = 1001
-	service := NewService(memory.NewChannelStore())
-	created, err := service.CreateMegagroupFromCreateChat(ctx, ownerID, domain.CreateChannelRequest{
-		Title:         "Private First",
-		MemberUserIDs: []int64{1002},
-		Date:          10,
-	})
-	if err != nil {
-		t.Fatalf("CreateMegagroupFromCreateChat: %v", err)
-	}
-
-	hidden, err := service.SetPreHistoryHidden(ctx, ownerID, created.Channel.ID, true)
-	if err != nil {
-		t.Fatalf("SetPreHistoryHidden: %v", err)
-	}
-	if !hidden.PreHistoryHidden {
-		t.Fatalf("hidden channel = %+v, want pre-history hidden", hidden)
-	}
-
-	// Assigning a public username must force pre-history back to visible.
-	public, err := service.UpdateUsername(ctx, ownerID, domain.UpdateChannelUsernameRequest{
-		ChannelID: created.Channel.ID,
-		Username:  "private_first_pub",
-	})
-	if err != nil {
-		t.Fatalf("UpdateUsername: %v", err)
-	}
-	if public.PreHistoryHidden {
-		t.Fatalf("public channel = %+v, want pre-history visible after publish", public)
-	}
-
-	// Removing the username leaves the flag alone (still visible).
-	private, err := service.UpdateUsername(ctx, ownerID, domain.UpdateChannelUsernameRequest{
-		ChannelID: created.Channel.ID,
-		Username:  "",
-	})
-	if err != nil {
-		t.Fatalf("UpdateUsername clear: %v", err)
-	}
-	if private.PreHistoryHidden {
-		t.Fatalf("re-privated channel = %+v, want pre-history still visible", private)
-	}
-
-	// ...and the creator can hide it again once private.
-	rehidden, err := service.SetPreHistoryHidden(ctx, ownerID, created.Channel.ID, true)
-	if err != nil {
-		t.Fatalf("SetPreHistoryHidden after re-privating: %v", err)
-	}
-	if !rehidden.PreHistoryHidden {
-		t.Fatalf("re-hidden channel = %+v, want pre-history hidden again", rehidden)
-	}
-}
-
 func TestListStoryPostableChannelsFiltersPostStoryRights(t *testing.T) {
 	ctx := context.Background()
 	service := NewService(memory.NewChannelStore())
diff --git a/internal/store/memory/channel_settings.go b/internal/store/memory/channel_settings.go
index 14f9089e..08134f56 100644
--- a/internal/store/memory/channel_settings.go
+++ b/internal/store/memory/channel_settings.go
@@ -175,13 +175,6 @@ func (s *ChannelStore) UpdateUsername(ctx context.Context, req domain.UpdateChan
 	}
 	prevUsername := channel.Username
 	channel.Username = username
-	// A public group cannot keep pre-history hidden: assigning a username forces
-	// "chat history for new members" back to visible (matches the official
-	// server). Removing the username leaves the flag untouched.
-	clearedPrehistory := username != "" && channel.PreHistoryHidden
-	if clearedPrehistory {
-		channel.PreHistoryHidden = false
-	}
 	s.channels[req.ChannelID] = channel
 	s.appendChannelAdminLogLocked(domain.ChannelAdminLogEvent{
 		ChannelID:  req.ChannelID,
@@ -191,16 +184,6 @@ func (s *ChannelStore) UpdateUsername(ctx context.Context, req domain.UpdateChan
 		PrevString: prevUsername,
 		NewString:  username,
 	})
-	if clearedPrehistory {
-		s.appendChannelAdminLogLocked(domain.ChannelAdminLogEvent{
-			ChannelID: req.ChannelID,
-			UserID:    req.UserID,
-			Date:      int(time.Now().Unix()),
-			Type:      domain.ChannelAdminLogTogglePreHistoryHidden,
-			PrevBool:  true,
-			NewBool:   false,
-		})
-	}
 	return channel, nil
 }
 
diff --git a/internal/store/postgres/channel_settings.go b/internal/store/postgres/channel_settings.go
index f9c8625b..e2082476 100644
--- a/internal/store/postgres/channel_settings.go
+++ b/internal/store/postgres/channel_settings.go
@@ -241,29 +241,12 @@ func (s *ChannelStore) UpdateUsername(ctx context.Context, req domain.UpdateChan
 	if err := replacePeerUsernameTx(ctx, tx, peerUsernameTypeChannel, req.ChannelID, username, usernameLower); err != nil {
 		return domain.Channel{}, err
 	}
-	// A public group cannot keep pre-history hidden: assigning a username forces
-	// "chat history for new members" back to visible (matches the official
-	// server). Removing the username leaves the flag untouched, so the creator
-	// can hide history again once the group is private.
-	if _, err := tx.Exec(ctx, `UPDATE channels SET username = NULLIF($2,''), pre_history_hidden = (pre_history_hidden AND $2 = ''), updated_at = now() WHERE id = $1`, req.ChannelID, username); err != nil {
+	if _, err := tx.Exec(ctx, `UPDATE channels SET username = NULLIF($2,''), updated_at = now() WHERE id = $1`, req.ChannelID, username); err != nil {
 		return domain.Channel{}, fmt.Errorf("update channel username: %w", err)
 	}
 	if err := markUserChannelMemberIndexPublicTx(ctx, tx, req.ChannelID, username != ""); err != nil {
 		return domain.Channel{}, err
 	}
-	if username != "" && channel.PreHistoryHidden {
-		if err := s.insertChannelAdminLogTx(ctx, tx, domain.ChannelAdminLogEvent{
-			ChannelID: req.ChannelID,
-			UserID:    req.UserID,
-			Date:      nowUnix(),
-			Type:      domain.ChannelAdminLogTogglePreHistoryHidden,
-			PrevBool:  true,
-			NewBool:   false,
-		}); err != nil {
-			return domain.Channel{}, err
-		}
-		channel.PreHistoryHidden = false
-	}
 	prevUsername := channel.Username
 	channel.Username = username
 	if err := s.insertChannelAdminLogTx(ctx, tx, domain.ChannelAdminLogEvent{