feat: use database transactions to ensure atomicity

cmd/goyco/commands/seed.go

@@ -57,10 +57,15 @@ func HandleSeedCommand(cfg *config.Config, name string, args []string) error {
 	}
 
 	return withDatabase(cfg, func(db *gorm.DB) error {
-		userRepo := repositories.NewUserRepository(db)
-		postRepo := repositories.NewPostRepository(db)
-		voteRepo := repositories.NewVoteRepository(db)
-		return runSeedCommand(userRepo, postRepo, voteRepo, fs.Args())
+		return db.Transaction(func(tx *gorm.DB) error {
+			userRepo := repositories.NewUserRepository(db).WithTx(tx)
+			postRepo := repositories.NewPostRepository(db).WithTx(tx)
+			voteRepo := repositories.NewVoteRepository(db).WithTx(tx)
+			if err := runSeedCommand(userRepo, postRepo, voteRepo, fs.Args()); err != nil {
+				return err
+			}
+			return nil
+		})
 	})
 }