add service

internal/repository/user.go

@@ -86,6 +86,14 @@ func (r *userRepository) FindByID(ctx context.Context, userID int) (*model.User,
 }
 
 func (r *userRepository) Create(ctx context.Context, user *model.User) error {
+	return r.createWithExecutor(ctx, r.pool, user)
+}
+
+func (r *userRepository) CreateTx(ctx context.Context, tx pgx.Tx, user *model.User) error {
+	return r.createWithExecutor(ctx, tx, user)
+}
+
+func (r *userRepository) createWithExecutor(ctx context.Context, exec DBTX, user *model.User) error {
 	encryptedEmail, err := r.cryptoHelper.Encrypt(user.Email)
 	if err != nil {
 		return errs.NewInternalError(errs.EncryptionError, "failed to encrypt email", err)
@@ -114,7 +122,7 @@ func (r *userRepository) Create(ctx context.Context, user *model.User) error {
 		return errs.NewInternalError(errs.DatabaseError, "failed to build query", err)
 	}
 
-	err = r.pool.QueryRow(ctx, sqlQuery, args...).Scan(&user.ID)
+	err = exec.QueryRow(ctx, sqlQuery, args...).Scan(&user.ID)
 	if err != nil {
 		return errs.NewInternalError(errs.DatabaseError, "failed to create user", err)
 	}