A repository must bind a slice safely into an SQL `IN` clause and support PostgreSQL plac…

A repository must bind a slice safely into an SQL `IN` clause and support PostgreSQL placeholders. Which sequence is correct?

1. Use `sqlx.In` to expand placeholders and arguments, then call `db.Rebind` before execution.
2. Join values into the SQL string, then quote the complete query with `fmt.Sprintf`.
3. Pass the slice as one `?` argument; every driver expands it automatically.