feat: image variants cache panel

internal/infrastructure/persistence/models/imageVariantFileModel.go

@@ -11,4 +11,12 @@ type ImageVariantFile struct {
 	Size        int64  `gorm:"not null"`
 	Fingerprint string `gorm:"not null;size:64"`
 	CreatedAt   time.Time
+
+	LastRequestedAt *time.Time
+}
+
+type ImageVariantRejectionDay struct {
+	ID    uint32 `gorm:"primaryKey;autoIncrement"`
+	Day   string `gorm:"not null;size:10;uniqueIndex:idx_image_variant_rejection_days_day"`
+	Count int    `gorm:"not null"`
 }