feat: Users API, ownership transfer and removal of the legacy role string

internal/infrastructure/persistence/models/migrationMarkerModel.go

@@ -0,0 +1,8 @@
+package models
+
+import "time"
+
+type MigrationMarker struct {
+	Name      string    `gorm:"primaryKey;size:64"`
+	AppliedAt time.Time `gorm:"not null"`
+}