diff --git a/docs/changelog/index.md b/docs/changelog/index.md
index 5aadaa8c..81127050 100644
--- a/docs/changelog/index.md
+++ b/docs/changelog/index.md
@@ -41,6 +41,7 @@ sidebar: false
 
 ### 修复
 
+- 修复 Agent 上报访问日志的 `bytes_sent` 在 Server 入库链路丢失，导致 Zone 概览“已提供的数据总计”长期为 0 的问题。
 - 修复嵌入式静态前端访问 `/websites/:zoneId` 时回退到首页 HTML，导致 Zone 详情页显示总览并触发 React hydration error 的问题。
 - Docker ClickHouse 性能配置改为单文件挂载，避免覆盖镜像内置的 Docker 网络监听配置，导致宿主机无法通过 8123/9000 访问服务。
 
diff --git a/internal/apps/openflare/agent/observability.go b/internal/apps/openflare/agent/observability.go
index 8d7a81d9..0edfa849 100644
--- a/internal/apps/openflare/agent/observability.go
+++ b/internal/apps/openflare/agent/observability.go
@@ -19,13 +19,13 @@ import (
 )
 
 const (
-	healthEventStatusActive      = "active"
-	healthEventStatusResolved    = "resolved"
-	healthSeverityInfo           = "info"
-	healthSeverityWarning        = "warning"
-	healthSeverityCritical       = "critical"
-	accessLogPathMaxLength       = 100
-	healthEventMessageMaxLength  = 4096
+	healthEventStatusActive     = "active"
+	healthEventStatusResolved   = "resolved"
+	healthSeverityInfo          = "info"
+	healthSeverityWarning       = "warning"
+	healthSeverityCritical      = "critical"
+	accessLogPathMaxLength      = 100
+	healthEventMessageMaxLength = 4096
 )
 
 // PersistHeartbeatObservability stores profile, snapshots, traffic, access logs, and health events.
@@ -221,6 +221,7 @@ func buildNodeAccessLogRecords(nodeID string, direct []NodeAccessLog, buffered [
 				Host:       strings.TrimSpace(item.Host),
 				Path:       truncateForDatabase(strings.TrimSpace(item.Path), accessLogPathMaxLength),
 				StatusCode: item.StatusCode,
+				BytesSent:  item.BytesSent,
 			}
 			if resolver != nil {
 				record.Region = resolver.Resolve(record.RemoteAddr)
diff --git a/internal/apps/openflare/agent/observability_test.go b/internal/apps/openflare/agent/observability_test.go
new file mode 100644
index 00000000..7151ffb3
--- /dev/null
+++ b/internal/apps/openflare/agent/observability_test.go
@@ -0,0 +1,33 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package agent
+
+import (
+	"testing"
+	"time"
+)
+
+func TestBuildNodeAccessLogRecordsPreservesBytesSent(t *testing.T) {
+	reportedAt := time.Date(2026, 7, 12, 10, 0, 0, 0, time.UTC)
+
+	records, err := buildNodeAccessLogRecords("node-a", []NodeAccessLog{
+		{
+			LoggedAtUnix: reportedAt.Unix(),
+			RemoteAddr:   "203.0.113.10",
+			Host:         "api.example.com",
+			Path:         "/v1/ping",
+			StatusCode:   200,
+			BytesSent:    4096,
+		},
+	}, nil, reportedAt)
+	if err != nil {
+		t.Fatalf("buildNodeAccessLogRecords() error = %v", err)
+	}
+	if len(records) != 1 {
+		t.Fatalf("expected one access log record, got %d", len(records))
+	}
+	if records[0].BytesSent != 4096 {
+		t.Fatalf("BytesSent = %d, want 4096", records[0].BytesSent)
+	}
+}
diff --git a/internal/repository/analytics/node_access_log_test.go b/internal/repository/analytics/node_access_log_test.go
index 6434490f..79a8fce6 100644
--- a/internal/repository/analytics/node_access_log_test.go
+++ b/internal/repository/analytics/node_access_log_test.go
@@ -39,6 +39,7 @@ func TestBatchInsertNodeAccessLogs_UsesModelBatchSQL(t *testing.T) {
 			Host:       "example.com",
 			Path:       "/alpha",
 			StatusCode: 200,
+			BytesSent:  2048,
 			CreatedAt:  loggedAt,
 		},
 	})
@@ -48,4 +49,6 @@ func TestBatchInsertNodeAccessLogs_UsesModelBatchSQL(t *testing.T) {
 	assert.True(t, mockBatch.sendCalled)
 	require.Len(t, mockBatch.rows, 1)
 	assert.Equal(t, "node-a", mockBatch.rows[0][1])
-}
\ No newline at end of file
+	require.Len(t, mockBatch.rows[0], 10)
+	assert.Equal(t, uint64(2048), mockBatch.rows[0][8])
+}
diff --git a/internal/repository/analytics/node_access_log_writer.go b/internal/repository/analytics/node_access_log_writer.go
index 88b02336..0382931c 100644
--- a/internal/repository/analytics/node_access_log_writer.go
+++ b/internal/repository/analytics/node_access_log_writer.go
@@ -47,6 +47,7 @@ func BatchInsertNodeAccessLogs(ctx context.Context, logs []analyticsmodel.NodeAc
 			logItem.Host,
 			logItem.Path,
 			logItem.StatusCode,
+			logItem.BytesSent,
 			createdAt.UTC(),
 		); err != nil {
 			return fmt.Errorf("append node access log to batch: %w", err)
@@ -57,4 +58,4 @@ func BatchInsertNodeAccessLogs(ctx context.Context, logs []analyticsmodel.NodeAc
 		return fmt.Errorf("send clickhouse batch: %w", err)
 	}
 	return nil
-}
\ No newline at end of file
+}