fix(usage): 统计按客户端本地日聚合 —— 修「29号却显示28号数据」时区 bug

根因:服务端用量全按 UTC 预切天,UTC+8 用户在中国 0-8 点时 UTC 还是前一天,
「今天」就显示前一天数据。

改法(用户拍板:小时桶+查询带时区偏移):
- migration 000017 `usage_hourly`(UTC 纪元小时整数桶,稀疏存储,空小时不落行)。
- ReportUsage 同时累加 usage_hourly(按 windowEnd 的 UTC 小时);usage_daily 保留作配额/今日。
- `UsageCurve(days, offsetMin)`:读 UTC 小时桶,按客户端时区偏移**重新聚合成本地日**曲线。
- `/v1/usage?tz_offset=分钟`;客户端 `usage()` 带 `DateTime.now().timeZoneOffset.inMinutes`。
- 客户端早已「取曲线最后一点当今日」,故只改服务端聚合 + 带偏移即可。

测试:store 时区分桶证明（UTC 18:00 在 UTC vs UTC+8 落不同本地日,锁住 bug 修复）+
migration v17 + usage_hourly 表;集成测试改喂 hourly;全量 go/flutter test 绿。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/services/account_api.dart

@@ -64,9 +64,12 @@ class AccountApi {
     await _c.postJson('/v1/me/devices/$uuid/logout');
   }
 
-  /// GET /v1/usage?days=N — 最近 N 天用量(默认 7,后端范围 [1,90])。
+  /// GET /v1/usage?days=N&tz_offset=M — 最近 N 天用量(默认 7,后端范围 [1,90])。
+  /// 带本机时区偏移(分钟,如 UTC+8=480),服务端按「本地日」聚合 → 「今天」与本地日历一致
+  /// (修「29 号却显示 28 号数据」的时区 bug)。
   Future<List<UsagePoint>> usage({int days = 7}) async {
-    final body = await _c.getJson('/v1/usage?days=$days');
+    final tz = DateTime.now().timeZoneOffset.inMinutes;
+    final body = await _c.getJson('/v1/usage?days=$days&tz_offset=$tz');
     final raw = (body['points'] as List<dynamic>?) ?? const [];
     return raw.map((e) => UsagePoint.fromJson(e as Map<String, dynamic>)).toList();
   }

server/internal/nodes/grpc_test.go

@@ -36,6 +36,7 @@ type mockNodeStore struct {
 	nodeUUID      string
 	configVer     int64
 	usageAccum    []mockUsageEntry
+	hourlyAccum   []mockUsageEntry
 	usersByDpUUID map[string]int64
 	// devicesByDpUUID maps a per-device dp_uuid → {userID, deviceID}.
 	devicesByDpUUID  map[string][2]int64
@@ -122,6 +123,15 @@ func (m *mockNodeStore) AccumulateUsage(_ context.Context, userID int64, date ti
 	return nil
 }
 
+func (m *mockNodeStore) AccumulateHourly(_ context.Context, userID int64, hour time.Time,
+	bytesUp, bytesDown, minutes int64,
+) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.hourlyAccum = append(m.hourlyAccum, mockUsageEntry{userID, hour, bytesUp, bytesDown, minutes})
+	return nil
+}
+
 func (m *mockNodeStore) EnsureDeviceDpUUID(_ context.Context, _ int64, _ string) (string, int64, error) {
 	return "", 0, nil
 }

server/internal/nodes/handler_grpc.go

@@ -302,13 +302,20 @@ func (h *Handler) ReportUsage(ctx context.Context, req *agentv1.UsageReport) (*a
 		if !found {
 			continue
 		}
-		// Account-level rollup (always).
+		// Account-level rollup (always): daily (quota/today) + hourly (tz-aware
+		// display curve, keyed by the window-end's UTC hour).
 		if err := h.store.AccumulateUsage(ctx, userID, date,
 			entry.BytesUp, entry.BytesDown, entry.SessionMinutes,
 		); err != nil {
 			slog.Warn("nodes.Handler.ReportUsage: accumulate failed",
 				"user_id", userID, "err", err)
 		}
+		if err := h.store.AccumulateHourly(ctx, userID, windowEnd,
+			entry.BytesUp, entry.BytesDown, entry.SessionMinutes,
+		); err != nil {
+			slog.Warn("nodes.Handler.ReportUsage: hourly accumulate failed",
+				"user_id", userID, "err", err)
+		}
 		// Per-device attribution (only when the dp_uuid maps to a registered device;
 		// deviceID==0 means a legacy account-level credential — no device dimension).
 		if deviceID > 0 {

server/internal/nodes/store.go

@@ -94,6 +94,11 @@ type NodeStore interface {
 	AccumulateUsage(ctx context.Context, userID int64, date time.Time,
 		bytesUp, bytesDown int64, minutes int64) error
 
+	// AccumulateHourly adds bytes/minutes to usage_hourly keyed by the UTC epoch
+	// hour of `hour` (for timezone-aware local-day bucketing at query time).
+	AccumulateHourly(ctx context.Context, userID int64, hour time.Time,
+		bytesUp, bytesDown int64, minutes int64) error
+
 	// AccountDayBytes returns the account's total bytes (up+down) for userID on
 	// date — the basis for the GB 综合配额 connect gate. 0 when no usage yet.
 	AccountDayBytes(ctx context.Context, userID int64, date time.Time) (int64, error)
@@ -475,3 +480,24 @@ func (s *SQLNodeStore) AccumulateUsage(
 	}
 	return nil
 }
+
+// AccumulateHourly adds bytes/minutes to usage_hourly for (userID, UTC epoch
+// hour). Epoch hour = floor(unix_seconds / 3600); the read side re-buckets these
+// into the client's local days. Idempotent within an hour.
+func (s *SQLNodeStore) AccumulateHourly(
+	ctx context.Context, userID int64, hour time.Time,
+	bytesUp, bytesDown int64, minutes int64,
+) error {
+	h := hour.UTC().Unix() / 3600
+	q := `
+		INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used)
+		VALUES (?, ?, ?, ?, ?)
+		` + s.dialect.Upsert([]string{"user_id", "hour"},
+		"bytes_up = bytes_up + EXCLUDED.bytes_up",
+		"bytes_down = bytes_down + EXCLUDED.bytes_down",
+		"minutes_used = minutes_used + EXCLUDED.minutes_used")
+	if _, err := s.db.ExecContext(ctx, q, userID, h, bytesUp, bytesDown, minutes); err != nil {
+		return fmt.Errorf("nodes.SQLNodeStore.AccumulateHourly: %w", err)
+	}
+	return nil
+}

server/internal/store/sqlite_migrate_test.go

@@ -29,8 +29,8 @@ func TestSQLiteMigrateUpDown(t *testing.T) {
 	if dirty {
 		t.Fatalf("schema dirty after MigrateUp")
 	}
-	if v != 16 {
-		t.Errorf("version = %d, want 16", v)
+	if v != 17 {
+		t.Errorf("version = %d, want 17", v)
 	}
 
 	// 2. Core tables exist.
@@ -38,7 +38,7 @@ func TestSQLiteMigrateUpDown(t *testing.T) {
 		"users", "devices", "plans", "subscriptions", "code_batches", "codes",
 		"usage_daily", "audit_log", "providers", "nodes", "node_events",
 		"directory_version", "provision_idempotency", "replacements", "admins",
-		"connect_credentials", "usage_device_daily", "sessions",
+		"connect_credentials", "usage_device_daily", "sessions", "usage_hourly",
 	} {
 		var name string
 		err := db.QueryRow(

server/internal/store/usage_tz_test.go

@@ -0,0 +1,64 @@
+package store_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/wangjia/pangolin/server/internal/usage"
+)
+
+// The timezone-fix proof: usage stored at UTC 18:00 yesterday must land on a
+// DIFFERENT local calendar day under UTC (offset 0) vs UTC+8 (offset 480) —
+// exactly the "今天却显示昨天数据" bug. UsageCurve re-buckets UTC hourly rows by
+// the client's local day so "today" matches the user's calendar.
+func TestSQLite_UsageCurve_LocalDayBucketing(t *testing.T) {
+	ctx := context.Background()
+	db := openSQLite(t)
+
+	// Yesterday 18:00 UTC = today 02:00 in UTC+8 → straddles the day boundary.
+	now := time.Now().UTC()
+	y := now.AddDate(0, 0, -1)
+	utc18 := time.Date(y.Year(), y.Month(), y.Day(), 18, 0, 0, 0, time.UTC)
+	hourEpoch := utc18.Unix() / 3600
+	if _, err := db.Exec(
+		`INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used) VALUES (1,?,?,?,?)`,
+		hourEpoch, 1000, 2000, 5); err != nil {
+		t.Fatalf("seed: %v", err)
+	}
+
+	cn := time.FixedZone("UTC+8", 8*3600)
+	utcDate := utc18.Format("2006-01-02")    // yesterday (UTC)
+	cnDate := utc18.In(cn).Format("2006-01-02") // today (UTC+8)
+	if utcDate == cnDate {
+		t.Fatalf("test setup expected different dates, got %s == %s", utcDate, cnDate)
+	}
+
+	svc := usage.NewService(usage.NewStore(db), nil, nil, time.Hour)
+
+	find := func(days, offset int, date string) (usage.UsagePoint, bool) {
+		pts, e := svc.UsageCurve(ctx, 1, days, offset)
+		if e != nil {
+			t.Fatalf("UsageCurve(off=%d): %v", offset, e)
+		}
+		for _, p := range pts {
+			if p.Date == date {
+				return p, true
+			}
+		}
+		return usage.UsagePoint{}, false
+	}
+
+	// Offset 0 (UTC): the data is on yesterday's UTC date.
+	if p, ok := find(3, 0, utcDate); !ok || p.BytesDown != 2000 || p.BytesUp != 1000 || p.MinutesUsed != 5 {
+		t.Fatalf("UTC bucket: want data on %s, got ok=%v %+v", utcDate, ok, p)
+	}
+	// Offset +480 (UTC+8): the SAME data is on today's local date instead.
+	if p, ok := find(3, 480, cnDate); !ok || p.BytesDown != 2000 {
+		t.Fatalf("UTC+8 bucket: want data on %s, got ok=%v %+v", cnDate, ok, p)
+	}
+	// And under +480 it must NOT appear on the UTC date.
+	if p, ok := find(3, 480, utcDate); ok && p.BytesDown != 0 {
+		t.Fatalf("UTC+8: data leaked onto UTC date %s: %+v", utcDate, p)
+	}
+}

server/internal/usage/handler.go

@@ -58,7 +58,16 @@ func (h *UsageHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		days = n
 	}
 
-	points, apiErr := h.svc.UsageCurve(r.Context(), userID, days)
+	// tz_offset: client UTC offset in minutes (e.g. 480 for UTC+8), so the curve
+	// is bucketed by the user's LOCAL calendar day. Absent/invalid → 0 (UTC).
+	offsetMin := 0
+	if v := r.URL.Query().Get("tz_offset"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			offsetMin = n
+		}
+	}
+
+	points, apiErr := h.svc.UsageCurve(r.Context(), userID, days, offsetMin)
 	if apiErr != nil {
 		apierr.WriteJSON(w, http.StatusInternalServerError, apiErr)
 		return

server/internal/usage/service.go

@@ -46,38 +46,59 @@ type UsagePoint struct {
 	MinutesUsed int    `json:"minutes_used"`
 }
 
-// UsageCurve returns the last `days` daily points for userID (UTC), with
-// missing days zero-filled, oldest first.  days is clamped to [1, 90].
-func (svc *Service) UsageCurve(ctx context.Context, userID int64, days int) ([]UsagePoint, *apierr.Error) {
+// UsageCurve returns the last `days` usage points for userID bucketed in the
+// CLIENT's timezone (offsetMin = client UTC offset in minutes, e.g. 480 for
+// UTC+8), missing days zero-filled, oldest first. days clamped to [1,90].
+//
+// It reads UTC hourly buckets (usage_hourly) and re-aggregates by local calendar
+// day, so "today" matches the user's local date regardless of server timezone
+// (fixes "29号却显示28号数据"). offsetMin out of ±14h falls back to 0 (UTC).
+func (svc *Service) UsageCurve(ctx context.Context, userID int64, days, offsetMin int) ([]UsagePoint, *apierr.Error) {
 	if days < 1 {
 		days = 7
 	}
 	if days > 90 {
 		days = 90
 	}
+	if offsetMin < -14*60 || offsetMin > 14*60 {
+		offsetMin = 0
+	}
+	loc := time.FixedZone("client", offsetMin*60)
 
-	today := utcToday()
-	from := today.AddDate(0, 0, -(days - 1))
+	now := nowFunc().UTC()
+	ln := now.In(loc)
+	localToday := time.Date(ln.Year(), ln.Month(), ln.Day(), 0, 0, 0, 0, loc)
+	fromLocal := localToday.AddDate(0, 0, -(days - 1))
 
-	rows, err := svc.store.GetUsageRange(ctx, userID, from, today)
+	fromHour := fromLocal.UTC().Unix() / 3600
+	toHour := now.Unix() / 3600
+
+	rows, err := svc.store.HourlyRange(ctx, userID, fromHour, toHour)
 	if err != nil {
 		return nil, apierr.ErrInternal
 	}
-	byDate := make(map[string]DailyUsage, len(rows))
-	for _, r := range rows {
-		byDate[r.Date.UTC().Format(dateLayout)] = r
+	type agg struct {
+		up, down uint64
+		min      int
+	}
+	byDay := make(map[string]*agg)
+	for _, b := range rows {
+		key := time.Unix(b.Hour*3600, 0).In(loc).Format(dateLayout)
+		a := byDay[key]
+		if a == nil {
+			a = &agg{}
+			byDay[key] = a
+		}
+		a.up += b.BytesUp
+		a.down += b.BytesDown
+		a.min += b.MinutesUsed
 	}
 
 	points := make([]UsagePoint, 0, days)
 	for i := 0; i < days; i++ {
-		d := from.AddDate(0, 0, i).Format(dateLayout)
-		if u, ok := byDate[d]; ok {
-			points = append(points, UsagePoint{
-				Date:        d,
-				BytesUp:     u.BytesUp,
-				BytesDown:   u.BytesDown,
-				MinutesUsed: u.MinutesUsed,
-			})
+		d := fromLocal.AddDate(0, 0, i).Format(dateLayout)
+		if a, ok := byDay[d]; ok {
+			points = append(points, UsagePoint{Date: d, BytesUp: a.up, BytesDown: a.down, MinutesUsed: a.min})
 		} else {
 			points = append(points, UsagePoint{Date: d})
 		}

server/internal/usage/store.go

@@ -107,6 +107,38 @@ func (s *Store) GetUsageRange(ctx context.Context, userID int64, from, to time.T
 	return out, rows.Err()
 }
 
+// HourBucket is one UTC epoch-hour's account usage (read from usage_hourly).
+type HourBucket struct {
+	Hour        int64 // unix epoch hour (UTC) = floor(unix_seconds / 3600)
+	BytesUp     uint64
+	BytesDown   uint64
+	MinutesUsed int
+}
+
+// HourlyRange returns usage_hourly rows for userID with hour in [fromHour, toHour]
+// (inclusive, epoch hours), oldest first. Empty hours are simply absent.
+func (s *Store) HourlyRange(ctx context.Context, userID, fromHour, toHour int64) ([]HourBucket, error) {
+	rows, err := s.db.QueryContext(ctx,
+		`SELECT hour, bytes_up, bytes_down, minutes_used
+		 FROM usage_hourly
+		 WHERE user_id = ? AND hour BETWEEN ? AND ?
+		 ORDER BY hour ASC`,
+		userID, fromHour, toHour)
+	if err != nil {
+		return nil, fmt.Errorf("store.HourlyRange: %w", err)
+	}
+	defer rows.Close()
+	var out []HourBucket
+	for rows.Next() {
+		var b HourBucket
+		if err := rows.Scan(&b.Hour, &b.BytesUp, &b.BytesDown, &b.MinutesUsed); err != nil {
+			return nil, fmt.Errorf("store.HourlyRange scan: %w", err)
+		}
+		out = append(out, b)
+	}
+	return out, rows.Err()
+}
+
 // DeviceUsageRow is one device's aggregated usage over a date window, joined to
 // the devices table for display metadata.  It is the per-device ("下分设备")
 // counterpart of DailyUsage's account rollup.

server/internal/usage/usage_integration_test.go

@@ -438,11 +438,14 @@ func TestIntUsageCurveZeroFill(t *testing.T) {
 
 	uid := createUser(t, db, "dp-curve")
 	today := time.Now().UTC()
-	// Only two of the last 7 days have data.
-	store.AggregateUsage(context.Background(), uid, today, 1000, 2000, 5)
-	store.AggregateUsage(context.Background(), uid, today.AddDate(0, 0, -3), 50, 60, 2)
+	epochHour := func(tm time.Time) int64 { return tm.UTC().Unix() / 3600 }
+	// Only two of the last 7 days have data (curve reads hourly buckets now).
+	db.Exec(`INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used) VALUES (?,?,?,?,?)`,
+		uid, epochHour(today), 1000, 2000, 5)
+	db.Exec(`INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used) VALUES (?,?,?,?,?)`,
+		uid, epochHour(today.AddDate(0, 0, -3)), 50, 60, 2)
 
-	points, apiErr := svc.UsageCurve(context.Background(), uid, 7)
+	points, apiErr := svc.UsageCurve(context.Background(), uid, 7, 0)
 	if apiErr != nil {
 		t.Fatalf("curve: %v", apiErr)
 	}
@@ -479,10 +482,11 @@ func TestIntUsageCurveOnlyCurrentUser(t *testing.T) {
 
 	uA := createUser(t, db, "dp-A")
 	uB := createUser(t, db, "dp-B")
-	store.AggregateUsage(context.Background(), uA, time.Now().UTC(), 111, 0, 1)
-	store.AggregateUsage(context.Background(), uB, time.Now().UTC(), 999, 0, 9)
+	h := time.Now().UTC().Unix() / 3600
+	db.Exec(`INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used) VALUES (?,?,?,?,?)`, uA, h, 111, 0, 1)
+	db.Exec(`INSERT INTO usage_hourly (user_id, hour, bytes_up, bytes_down, minutes_used) VALUES (?,?,?,?,?)`, uB, h, 999, 0, 9)
 
-	points, _ := svc.UsageCurve(context.Background(), uA, 1)
+	points, _ := svc.UsageCurve(context.Background(), uA, 1, 0)
 	if len(points) != 1 || points[0].BytesUp != 111 {
 		t.Errorf("user A curve leaked other user data: %+v", points)
 	}

server/migrations/mysql/000017_usage_hourly.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS usage_hourly;

server/migrations/mysql/000017_usage_hourly.up.sql

@@ -0,0 +1,9 @@
+-- 见 sqlite/000017 注释。hour = unix 纪元小时(UTC)。
+CREATE TABLE usage_hourly (
+  user_id      BIGINT UNSIGNED NOT NULL,
+  hour         BIGINT NOT NULL,
+  bytes_up     BIGINT UNSIGNED NOT NULL DEFAULT 0,
+  bytes_down   BIGINT UNSIGNED NOT NULL DEFAULT 0,
+  minutes_used INT NOT NULL DEFAULT 0,
+  PRIMARY KEY (user_id, hour)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

server/migrations/sqlite/000017_usage_hourly.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS usage_hourly;

server/migrations/sqlite/000017_usage_hourly.up.sql

@@ -0,0 +1,13 @@
+-- 按 UTC「小时桶」记录账户用量,供 /v1/usage 按客户端时区聚合成「本地日」曲线
+-- (修「今天显示昨天数据」的时区 bug:不再服务端按 UTC 预切天,而是存小时、查询时带
+--  客户端时区偏移按本地日聚合)。usage_daily 仍保留作配额/今日/解锁。
+-- hour = unix 纪元小时数(floor(unix_seconds/3600),UTC),整数无时区歧义、聚合好算。
+-- 稀疏:无用量的小时不落行(用户非 24h 在线,实际远少于 24 行/天)。
+CREATE TABLE usage_hourly (
+  user_id      INTEGER NOT NULL,
+  hour         INTEGER NOT NULL,    -- unix 纪元小时(UTC)
+  bytes_up     INTEGER NOT NULL DEFAULT 0,
+  bytes_down   INTEGER NOT NULL DEFAULT 0,
+  minutes_used INTEGER NOT NULL DEFAULT 0,
+  PRIMARY KEY (user_id, hour)
+);