add access token validation logic and some media stuff

backend/internal/models/media.go

@@ -0,0 +1,20 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/datatypes"
+)
+
+type Media struct {
+	ID          string         `gorm:"primaryKey"`
+	Title       string         `gorm:"not null"`
+	Description string         `gorm:"not null"`
+	Tags        datatypes.JSON `gorm:"type:json"`
+	AlbumID     string         `gorm:"not null"`
+	Path        string         `gorm:"not null"`
+	Type        string         `gorm:"not null"`  // MIME type
+	Metadata    datatypes.JSON `gorm:"type:json"` // Metadata about the media.
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}