fix(canvas): 素材库 - 拒绝空字节数并提供历史数据修复工具

backend/cmd/migrate-schema/main.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"strings"
 
+	"infinite-canvas/backend/internal/canvas"
 	"infinite-canvas/backend/internal/database"
 )
 
@@ -15,6 +16,14 @@ func main() {
 	if len(os.Args) > 1 {
 		command = strings.ToLower(strings.TrimSpace(os.Args[1]))
 	}
+	apply := false
+	if command == "repair-asset-bytes" {
+		if len(os.Args) == 3 && os.Args[2] == "--apply" {
+			apply = true
+		} else if len(os.Args) > 2 {
+			log.Fatal("用法：migrate-schema repair-asset-bytes [--apply]；默认只检查")
+		}
+	}
 	db, err := database.Open(database.Config{
 		Driver:  env("CANVAS_DATABASE_DRIVER", "sqlite"),
 		DSN:     os.Getenv("DATABASE_URL"),
@@ -33,6 +42,20 @@ func main() {
 	defer sqlDB.Close()
 
 	switch command {
+	case "repair-asset-bytes":
+		report, repairErr := canvas.RepairAssetBytes(db, apply)
+		encoded, err := json.Marshal(report)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Println(string(encoded))
+		if repairErr != nil {
+			log.Fatal(repairErr)
+		}
+		if len(report.Unresolved) > 0 {
+			log.Fatal("存在未修复素材，请按报告核查；未删除或填零")
+		}
+		return
 	case "up":
 		if err := database.MigrateSchema(db); err != nil {
 			log.Fatal(err)
@@ -43,7 +66,7 @@ func main() {
 			log.Fatal(err)
 		}
 	default:
-		log.Fatalf("未知命令 %q；可用命令：up、status、verify", command)
+		log.Fatalf("未知命令 %q；可用命令：up、status、verify、repair-asset-bytes", command)
 	}
 	status, err := database.ReadSchemaStatus(db)
 	if err != nil {