fix(messages): sync exact channel pinned counts

deploy/migrations/0149_channel_live_pinned_index.down.sql

@@ -0,0 +1 @@
+DROP INDEX CONCURRENTLY IF EXISTS public.channel_messages_live_pinned_idx;

deploy/migrations/0149_channel_live_pinned_index.up.sql

@@ -0,0 +1,3 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS channel_messages_live_pinned_idx
+    ON public.channel_messages (channel_id, id DESC)
+    WHERE pinned AND NOT deleted;

internal/domain/channel.go

@@ -2175,6 +2175,13 @@ type ChannelHistoryFilter struct {
 	SenderUserID int64
 	PinnedOnly   bool
 	MusicOnly    bool
+	// NeedTotalCount requests the exact number of messages matching the static
+	// filters before offset/add_offset pagination. Ordinary history pages leave
+	// this false and keep the bounded len(page)+has-more hint.
+	NeedTotalCount bool
+	// CountOnly skips message hydration and returns only the exact Count plus
+	// the viewer-scoped channel metadata needed for access validation.
+	CountOnly  bool
 	OffsetID   int
 	OffsetDate int
 	AddOffset  int

internal/rpc/channels_multi_pin_android_rpc_test.go

@@ -65,8 +65,8 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 		}
 		ids = append(ids, sent.Message.ID)
 	}
-	// 三条置顶：早期、中间、最新（Android 置顶栏循环跳转需要全部三条都可跳）。
+	// 五条置顶：覆盖用户反馈中的真实规模；Android 置顶栏循环跳转需要全部可跳。
-	pins := []int{ids[4], ids[14], ids[27]}
+	pins := []int{ids[4], ids[9], ids[14], ids[20], ids[27]}
 	for _, id := range pins {
 		if _, err := channelSvc.UpdatePinnedMessage(ctx, owner.ID, domain.UpdateChannelPinnedMessageRequest{
 			ChannelID: channelID,
@@ -113,7 +113,10 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 	if channelMessages.Count != len(pins) {
 		t.Fatalf("pinned search count = %d, want %d", channelMessages.Count, len(pins))
 	}
-	wantDesc := []int{pins[2], pins[1], pins[0]}
+	wantDesc := make([]int, len(pins))
+	for i := range pins {
+		wantDesc[i] = pins[len(pins)-1-i]
+	}
 	for i, raw := range channelMessages.Messages {
 		msg, ok := raw.(*tg.Message)
 		if !ok {
@@ -128,7 +131,49 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 		}
 	}
 
-	// ② 点置顶栏跳最旧 pin：scrollToMessageId → getHistory AROUND（手机 count=20）。
+	// ② tweb 冷加载：先用 limit=1 取最新 pin，并把 messages.channelMessages.count
+	// 当作完整置顶数；旧实现把 count 错算成 len(page)+hasMore，即五条只报两条。
+	twebSearchEnc := dispatch(&tg.MessagesSearchRequest{
+		Peer:   peer,
+		Q:      "",
+		Filter: &tg.InputMessagesFilterPinned{},
+		Limit:  1,
+	})
+	twebSearch, ok := twebSearchEnc.(*tg.MessagesChannelMessages)
+	if !ok {
+		t.Fatalf("tweb pinned search response = %T, want messages.channelMessages", twebSearchEnc)
+	}
+	if len(twebSearch.Messages) != 1 || twebSearch.Count != len(pins) {
+		t.Fatalf("tweb pinned search messages/count = %d/%d, want 1/%d", len(twebSearch.Messages), twebSearch.Count, len(pins))
+	}
+
+	// limit=0 是官方 count-only 入口：不得为了计数反序列化/返回消息页。
+	countOnlyEnc := dispatch(&tg.MessagesSearchRequest{
+		Peer:   peer,
+		Q:      "",
+		Filter: &tg.InputMessagesFilterPinned{},
+		Limit:  0,
+	})
+	countOnly, ok := countOnlyEnc.(*tg.MessagesChannelMessages)
+	if !ok {
+		t.Fatalf("count-only pinned search response = %T, want messages.channelMessages", countOnlyEnc)
+	}
+	if len(countOnly.Messages) != 0 || countOnly.Count != len(pins) {
+		t.Fatalf("count-only pinned search messages/count = %d/%d, want 0/%d", len(countOnly.Messages), countOnly.Count, len(pins))
+	}
+
+	counters, err := r.onMessagesGetSearchCounters(WithUserID(androidClientContext(), member.ID), &tg.MessagesGetSearchCountersRequest{
+		Peer:    peer,
+		Filters: []tg.MessagesFilterClass{&tg.InputMessagesFilterPinned{}},
+	})
+	if err != nil {
+		t.Fatalf("messages.getSearchCounters(filterPinned): %v", err)
+	}
+	if len(counters) != 1 || counters[0].Count != len(pins) {
+		t.Fatalf("pinned search counters = %+v, want count %d", counters, len(pins))
+	}
+
+	// ③ 点置顶栏跳最旧 pin：scrollToMessageId → getHistory AROUND（手机 count=20）。
 	const aroundCount = 20
 	histEnc := dispatch(&tg.MessagesGetHistoryRequest{
 		Peer:      peer,
@@ -160,7 +205,7 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 		t.Fatalf("around history lacks anchor %d: jump shows MessageNotFound on Android", pins[0])
 	}
 
-	// ③ 本地缺对象补拉：MessagesStorage.loadChatInfo → channels.getMessages。
+	// ④ 本地缺对象补拉：MessagesStorage.loadChatInfo → channels.getMessages。
 	// DrKLO 发的是 pre-InputMessage 构造器 #93d7b347（id:Vector<int>），
 	// 该请求 500 会让客户端把这批 pin 按「已取消置顶」从本地缓存删除。
 	var legacy bin.Buffer
@@ -208,7 +253,7 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 		}
 	}
 
-	// ④ chatFull 降级缓存：pinned_msg_id 必须是最新置顶（Android 以它判断是否重拉列表）。
+	// ⑤ chatFull 降级缓存：pinned_msg_id 必须是最新置顶（Android 以它判断是否重拉列表）。
 	fullEnc := dispatch(&tg.ChannelsGetFullChannelRequest{
 		Channel: &tg.InputChannel{ChannelID: channelID, AccessHash: memberView.Channel.AccessHash},
 	})
@@ -220,7 +265,7 @@ func TestChannelMultiPinAndroidOpenAndJump(t *testing.T) {
 	if !ok {
 		t.Fatalf("full chat = %T, want channelFull", full.FullChat)
 	}
-	if pinnedID, _ := channelFull.GetPinnedMsgID(); pinnedID != pins[2] {
+	if pinnedID, _ := channelFull.GetPinnedMsgID(); pinnedID != pins[len(pins)-1] {
-		t.Fatalf("channelFull pinned_msg_id = %d, want latest pin %d", pinnedID, pins[2])
+		t.Fatalf("channelFull pinned_msg_id = %d, want latest pin %d", pinnedID, pins[len(pins)-1])
 	}
 }

internal/rpc/messages_history.go

@@ -197,24 +197,36 @@ func (r *Router) onMessagesGetSearchCounters(ctx context.Context, req *tg.Messag
 	if err != nil {
 		return nil, err
 	}
+	needsPinned := false
+	needsMedia := false
+	for _, filter := range req.Filters {
+		if filter == nil {
+			continue
+		}
+		if _, ok := filter.(*tg.InputMessagesFilterPinned); ok {
+			needsPinned = true
+			continue
+		}
+		if len(mediaCategoriesForFilter(filter)) > 0 {
+			needsMedia = true
+		}
+	}
 	pinnedCount := 0
 	mediaCounts := domain.MediaCategoryCounts{}
-	if peer.Type == domain.PeerTypeChannel && r.deps.Channels != nil {
+	if needsPinned {
-		// 只读 PinnedMessageID（Channel 字段）：走轻量 ResolveChannel，省 dialog/读态/boost 查询。
+		switch {
-		view, err := r.deps.Channels.ResolveChannel(ctx, userID, peer.ID)
+		case peer.Type == domain.PeerTypeChannel && r.deps.Channels != nil:
+			history, err := r.deps.Channels.GetHistory(ctx, userID, domain.ChannelHistoryFilter{
+				ChannelID:      peer.ID,
+				PinnedOnly:     true,
+				NeedTotalCount: true,
+				CountOnly:      true,
+			})
 			if err != nil {
 				return nil, err
 			}
-		if view.Channel.PinnedMessageID > 0 {
+			pinnedCount = history.Count
-			pinnedCount = 1
+		case peer.Type == domain.PeerTypeUser && r.deps.Messages != nil:
-		}
-		counts, err := r.mediaCountsForPeer(ctx, userID, peer)
-		if err != nil {
-			return nil, err
-		}
-		mediaCounts = counts
-	}
-	if peer.Type == domain.PeerTypeUser && r.deps.Messages != nil {
 			list, err := r.deps.Messages.Search(ctx, userID, domain.MessageFilter{
 				HasPeer:        true,
 				Peer:           peer,
@@ -226,6 +238,9 @@ func (r *Router) onMessagesGetSearchCounters(ctx context.Context, req *tg.Messag
 				return nil, err
 			}
 			pinnedCount = list.Count
+		}
+	}
+	if needsMedia {
 		counts, err := r.mediaCountsForPeer(ctx, userID, peer)
 		if err != nil {
 			return nil, err
@@ -828,6 +843,7 @@ func (r *Router) messageFilterFromSearchRequest(ctx context.Context, userID int6
 
 func (r *Router) channelHistoryFilterFromSearchRequest(userID int64, req *tg.MessagesSearchRequest, channelID int64) (domain.ChannelHistoryFilter, bool) {
 	limit := req.Limit
+	countOnly := limit == 0
 	if limit <= 0 || limit > 100 {
 		limit = 100
 	}
@@ -836,6 +852,9 @@ func (r *Router) channelHistoryFilterFromSearchRequest(userID int64, req *tg.Mes
 		Query:      req.Q,
 		PinnedOnly: messagesSearchFilterPinned(req.Filter),
 		MusicOnly:  messagesSearchFilterMusic(req.Filter),
+		NeedTotalCount: countOnly ||
+			(req.OffsetID == 0 && req.MinDate == 0 && req.MaxDate == 0 && req.AddOffset >= 0 && req.Hash == 0),
+		CountOnly: countOnly,
 		OffsetID:  req.OffsetID,
 		AddOffset: domain.ClampMessageHistoryAddOffset(req.AddOffset),
 		Limit:     limit,

internal/store/memory/channel_message_history.go

@@ -66,6 +66,20 @@ func (s *ChannelStore) ListChannelHistory(_ context.Context, viewerUserID int64,
 		}
 		matched = append(matched, msg)
 	}
+	extraChannels := []domain.Channel(nil)
+	if channel.Monoforum && channel.LinkedMonoforumID != 0 {
+		if parent, ok := s.channels[channel.LinkedMonoforumID]; ok && !parent.Deleted {
+			extraChannels = append(extraChannels, cloneChannel(parent))
+		}
+	}
+	if filter.CountOnly {
+		return domain.ChannelHistory{
+			Channel:  channel,
+			Self:     member,
+			Channels: extraChannels,
+			Count:    len(matched),
+		}, nil
+	}
 	// add_offset 决定加载方向（对齐 postgres ListChannelHistory）：
 	//   >= 0           backward：锚点更旧方向（不含锚点），先跳过 add_offset 条
 	//   < 0 且 +limit>0 around：以锚点为中心，向更新取 -add_offset 条 + 向更旧（含锚点）取 limit+add_offset 条
@@ -160,14 +174,11 @@ func (s *ChannelStore) ListChannelHistory(_ context.Context, viewerUserID int64,
 	if hasMoreOlder {
 		count = len(out) + 1
 	}
+	if filter.NeedTotalCount {
+		count = len(matched)
+	}
 	s.populateChannelMessageRepliesLocked(viewerUserID, filter.ChannelID, out)
 	s.populateChannelMessageReactionsLocked(viewerUserID, channel, out)
-	extraChannels := []domain.Channel(nil)
-	if channel.Monoforum && channel.LinkedMonoforumID != 0 {
-		if parent, ok := s.channels[channel.LinkedMonoforumID]; ok && !parent.Deleted {
-			extraChannels = append(extraChannels, cloneChannel(parent))
-		}
-	}
 	return domain.ChannelHistory{
 		Channel:  channel,
 		Self:     member,

internal/store/postgres/channel_message_history.go

@@ -79,6 +79,24 @@ AND EXISTS (
 		baseArgs = append(baseArgs, filter.MinID)
 		base += fmt.Sprintf(" AND id > $%d", len(baseArgs))
 	}
+	out := domain.ChannelHistory{Channel: channel, Self: member, Channels: extraChannels}
+	needExactTotal := filter.NeedTotalCount || filter.CountOnly
+	exactTotal := 0
+	if needExactTotal {
+		// Exact totals are opt-in. messages.search first/count-only pages and
+		// messages.getSearchCounters need protocol-exact Count, while ordinary
+		// getHistory pages must stay on the single bounded page query.
+		if err := s.db.QueryRow(ctx,
+			"SELECT count(*)::int FROM channel_messages WHERE "+base,
+			baseArgs...,
+		).Scan(&exactTotal); err != nil {
+			return domain.ChannelHistory{}, fmt.Errorf("count channel history: %w", err)
+		}
+		out.Count = exactTotal
+	}
+	if filter.CountOnly {
+		return out, nil
+	}
 	scanList := func(sql string, queryArgs []any) ([]domain.ChannelMessage, error) {
 		rows, err := s.db.Query(ctx, sql, queryArgs...)
 		if err != nil {
@@ -102,7 +120,6 @@ AND EXISTS (
 	// store 层二次钳制 add_offset 到 [-100,100]（与私聊 ListMessagesByUser 对齐）：
 	// 即便某个 caller 漏在 RPC 层钳制，也不会把客户端巨大值变成大 SQL OFFSET 跳扫。
 	addOffset := domain.ClampMessageHistoryAddOffset(filter.AddOffset)
-	out := domain.ChannelHistory{Channel: channel, Self: member, Channels: extraChannels}
 	hasMoreOlder := false
 	// 锚点条件：offset_date 优先按日期、否则按消息 id（对齐私聊）；
 	// 二者皆空时向更新方向退化为空、向更旧方向退化为全部（取最新）。
@@ -199,10 +216,12 @@ AND EXISTS (
 		}
 		out.Messages = older
 	}
+	if !needExactTotal {
 		out.Count = len(out.Messages)
 		if hasMoreOlder {
 			out.Count = len(out.Messages) + 1
 		}
+	}
 	if err := s.populateChannelMessageReplies(ctx, s.db, viewerUserID, channel, out.Messages); err != nil {
 		return domain.ChannelHistory{}, err
 	}

internal/store/postgres/channel_multi_pin_integration_test.go

@@ -3,6 +3,7 @@ package postgres
 import (
 	"context"
 	"errors"
+	"strings"
 	"testing"
 
 	"telesrv/internal/domain"
@@ -98,6 +99,70 @@ func TestChannelMultiPin(t *testing.T) {
 			t.Fatalf("filterPinned message %d lacks pinned flag", msg.ID)
 		}
 	}
+	// 普通历史热路径保留 bounded has-more hint，不为每页额外 COUNT。
+	hint, err := channels.ListChannelHistory(ctx, owner.ID, domain.ChannelHistoryFilter{
+		ChannelID: channelID, PinnedOnly: true, Limit: 1,
+	})
+	if err != nil {
+		t.Fatalf("filterPinned hint page: %v", err)
+	}
+	if len(hint.Messages) != 1 || hint.Count != 2 {
+		t.Fatalf("filterPinned hint messages/count = %d/%d, want 1/2", len(hint.Messages), hint.Count)
+	}
+	// messages.search 首屏显式请求精确总数；页大小不能污染 Count。
+	exact, err := channels.ListChannelHistory(ctx, owner.ID, domain.ChannelHistoryFilter{
+		ChannelID: channelID, PinnedOnly: true, Limit: 1, NeedTotalCount: true,
+	})
+	if err != nil {
+		t.Fatalf("filterPinned exact page: %v", err)
+	}
+	if len(exact.Messages) != 1 || exact.Count != 3 {
+		t.Fatalf("filterPinned exact messages/count = %d/%d, want 1/3", len(exact.Messages), exact.Count)
+	}
+	// messages.getSearchCounters/limit=0 只计数，不加载消息及 reply/reaction companion。
+	countOnly, err := channels.ListChannelHistory(ctx, owner.ID, domain.ChannelHistoryFilter{
+		ChannelID: channelID, PinnedOnly: true, NeedTotalCount: true, CountOnly: true,
+	})
+	if err != nil {
+		t.Fatalf("filterPinned count-only: %v", err)
+	}
+	if len(countOnly.Messages) != 0 || countOnly.Count != 3 {
+		t.Fatalf("filterPinned count-only messages/count = %d/%d, want 0/3", len(countOnly.Messages), countOnly.Count)
+	}
+	// 精确计数只扫描该频道的 pinned 部分索引，不能退化为全频道消息扫描。
+	tx, err := pool.Begin(ctx)
+	if err != nil {
+		t.Fatalf("begin pinned count explain: %v", err)
+	}
+	defer tx.Rollback(ctx)
+	if _, err := tx.Exec(ctx, "SET LOCAL enable_seqscan = off"); err != nil {
+		t.Fatalf("disable seqscan for pinned count explain: %v", err)
+	}
+	rows, err := tx.Query(ctx, `EXPLAIN (COSTS OFF)
+SELECT count(*)::int
+FROM channel_messages
+WHERE channel_id = $1 AND NOT deleted AND pinned`, channelID)
+	if err != nil {
+		t.Fatalf("explain pinned count: %v", err)
+	}
+	var plan strings.Builder
+	for rows.Next() {
+		var line string
+		if err := rows.Scan(&line); err != nil {
+			rows.Close()
+			t.Fatalf("scan pinned count plan: %v", err)
+		}
+		plan.WriteString(line)
+		plan.WriteByte('\n')
+	}
+	if err := rows.Err(); err != nil {
+		rows.Close()
+		t.Fatalf("read pinned count plan: %v", err)
+	}
+	rows.Close()
+	if !strings.Contains(plan.String(), "channel_messages_live_pinned_idx") {
+		t.Fatalf("pinned count plan misses partial index:\n%s", plan.String())
+	}
 	// 普通历史页的消息行直接携带 pinned 标志（多置顶都标，不只最新）。
 	page, err := channels.ListChannelHistory(ctx, member.ID, domain.ChannelHistoryFilter{ChannelID: channelID, Limit: 50})
 	if err != nil {

internal/store/postgres/star_gift_lifecycle_migration_integration_test.go

@@ -14,7 +14,7 @@ func TestStarGiftLifecycleMigrationsApply(t *testing.T) {
 	if err != nil {
 		t.Fatalf("migrate star gift lifecycle schema: %v", err)
 	}
-	if status.Dirty || status.Empty || status.Version != 148 {
+	if status.Dirty || status.Empty || status.Version != 149 {
-		t.Fatalf("migration status = %+v, want clean version 148", status)
+		t.Fatalf("migration status = %+v, want clean version 149", status)
 	}
 }