feat: add working watchdog cycle

internal/database/define.go

@@ -41,9 +41,10 @@ type Device struct {
 type File struct {
 	ID        int       `gorm:"primaryKey"`
 	MediaType MediaType `gorm:"type:varchar(20);not null;"`
-	GivenName string
-	Filepath  string
-	Checksum  string // base64 encoded sha512 checksum
+	MetaName  string
+	FileName  string
+	FilePath  string
+	Checksum  string `gorm:"uniqueIndex"` // hex encoded sha512 checksum
 	CreatedAt time.Time
 	UpdatedAt time.Time
 }