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how to add columns to database table that are not contained in Entity

If I want to have DB table with scheme id|column1|rest of columns...

such as:

@Entity
@Table(name = "SampleEntity")
class SampleEntity(
        @Id @GeneratedValue val id: Long,
)

how can I add columns to table such that the table has these columns, but my entity does not?

I would like to be able to add these columns programmatically with a for loop. But any pointers would be appreciated.