Merge pull request #22 from Icinga/restore-build-columns

Restore deleted `DB#BuildColumns()`

database/db.go

@@ -22,6 +22,7 @@ import (
 	"golang.org/x/sync/semaphore"
 	"net"
 	"net/url"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -227,6 +228,11 @@ func (db *DB) GetAddr() string {
 	return db.addr
 }
 
+// BuildColumns returns all columns of the given struct.
+func (db *DB) BuildColumns(subject interface{}) []string {
+	return slices.Clone(db.columnMap.Columns(subject))
+}
+
 // BuildDeleteStmt returns a DELETE statement for the given struct.
 func (db *DB) BuildDeleteStmt(from interface{}) string {
 	return fmt.Sprintf(