feat: user creation

internal/repository/user.go

@@ -0,0 +1,41 @@
+package repository
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/robindittmar/dttmr-api/internal/domain"
+)
+
+type UserRepo struct {
+	db *sql.DB
+}
+
+func NewUserRepo(db *sql.DB) *UserRepo {
+	return &UserRepo{db: db}
+}
+
+func (r *UserRepo) CreateUser(ctx context.Context, email string, name string, passwordHash string) (*domain.User, error) {
+	tx, err := r.db.BeginTx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("begin transaction: %w", err)
+	}
+	defer tx.Rollback()
+
+	user := &domain.User{Email: email, Name: name}
+
+	err = tx.QueryRowContext(ctx,
+		"INSERT INTO users (email, name, password_hash) VALUES ($1, $2, $3) RETURNING id, created_at",
+		email, name, passwordHash,
+	).Scan(&user.ID, &user.CreatedAt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to insert user: %w", err)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit transaction: %w", err)
+	}
+
+	return user, err
+}