How do you define a Room table for a Kotlin data class?

Tests your understanding of the essential Room entity contract for Kotlin. A strong answer walks through three things: first, annotate the data class with Entity to declare a table; second, mark at least one property with PrimaryKey because Room requires it; third, note that Room infers columns from Kotlin properties automatically, so ColumnInfo is only needed for custom names. Red flag: insisting every property needs an annotation, confusing Entity with Database or DAO, or omitting the primary key.