[management] network map from nmap data type (#6919)

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>
Co-authored-by: Dmitri Dolguikh <dmitri.external@netbird.io>

management/internals/network_map_db/pgsql/nameserver.go

@@ -0,0 +1,31 @@
+package networkmap_pgsql
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+	networkmapdb "github.com/netbirdio/netbird/management/internals/network_map_db"
+	"github.com/netbirdio/netbird/shared/management/networkmap/nmdata"
+)
+
+const (
+	GetNameserversQuery = `
+	select id, public_id, name, description, name_servers, groups, "primary", domains, enabled, search_domains_enabled
+	from name_server_groups
+	where account_id=$1
+	`
+)
+
+func (pgc *PgStoreConn) GetNameServerGroups(ctx context.Context, accountId string) ([]nmdata.NameServerGroup, error) {
+	rows, err := pgc.Conn.Query(ctx, GetNameserversQuery, accountId)
+	if err != nil {
+		return nil, err
+	}
+
+	nsgroups, err := pgx.CollectRows(rows, pgx.RowToStructByName[networkmapdb.NameserverGroup])
+	if err != nil {
+		return nil, err
+	}
+
+	return networkmapdb.ConvertAllToSharedTypes[networkmapdb.NameserverGroup, nmdata.NameServerGroup](nsgroups)
+}