func fetchCardIDs(ctx context.Context, db *cql.DB) ([]string, error) {
ids := []string{}
rows, err := db.QueryC(ctx, "SELECT id FROM cards")
if err != nil {
return ids, err
}
defer rows.Close()
for rows.Next() {
var id string
if err := rows.Scan(&id); err != nil {
return ids, err
}
ids = append(ids, id)
}
return ids, rows.Err()
}
