refactor: remove dbtx package

internal/tx.go

@@ -0,0 +1,28 @@
+package internal
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+)
+
+func Run[T any](ctx context.Context, sqlDB *sql.DB, repo T, withTx func(*sql.Tx) T, fn func(context.Context, T) error) error {
+	if sqlDB == nil {
+		return fn(ctx, repo)
+	}
+
+	tx, err := sqlDB.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+
+	txRepo := withTx(tx)
+	if err := fn(ctx, txRepo); err != nil {
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			return errors.Join(err, rollbackErr)
+		}
+		return err
+	}
+
+	return tx.Commit()
+}