Add db support for workspaces

backend/internal/models/user.go

@@ -0,0 +1,17 @@
+package models
+
+import (
+	"time"
+)
+
+type User struct {
+	ID           int       `json:"id" validate:"required,min=1"`
+	Username     string    `json:"username" validate:"required"`
+	Email        string    `json:"email" validate:"required,email"`
+	PasswordHash string    `json:"-"`
+	CreatedAt    time.Time `json:"createdAt"`
+}
+
+func (u *User) Validate() error {
+	return validate.Struct(u)
+}