Add db support for workspaces

backend/internal/db/user.go

@@ -0,0 +1,31 @@
+package db
+
+import (
+	"novamd/internal/models"
+)
+
+func (db *DB) CreateUser(user *models.User) error {
+	_, err := db.Exec("INSERT INTO users (username, email, password_hash) VALUES (?, ?, ?)",
+		user.Username, user.Email, user.PasswordHash)
+	return err
+}
+
+func (db *DB) GetUserByID(id int) (*models.User, error) {
+	user := &models.User{}
+	err := db.QueryRow("SELECT id, username, email, created_at FROM users WHERE id = ?", id).
+		Scan(&user.ID, &user.Username, &user.Email, &user.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return user, nil
+}
+
+func (db *DB) GetUserByUsername(username string) (*models.User, error) {
+	user := &models.User{}
+	err := db.QueryRow("SELECT id, username, email, password_hash, created_at FROM users WHERE username = ?", username).
+		Scan(&user.ID, &user.Username, &user.Email, &user.PasswordHash, &user.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return user, nil
+}