backend support record playback history

pkg/database/struct.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	"path/filepath"
+	"time"
 )
 
 type File struct {
@@ -58,6 +59,15 @@ type Feedback struct {
 	Time    int64  `json:"time"`
 }
 
+type Playback struct {
+	ID       int64         `json:"id"`
+	UserID   int64         `json:"user_id"`
+	FileID   int64         `json:"file_id"`
+	Time     time.Time     `json:"time"`
+	Method   int64         `json:"method"`
+	Duration time.Duration `json:"Duration"`
+}
+
 var (
 	RoleAnonymous = int64(0)
 	RoleAdmin     = int64(1)