Hello Klaus,
As you probably know, I have many Kaehler's in the Flintbek area. However, none that exactly match your e mail message. Here are two that are close:
Magdalena Christina Schlotfeldt, *abt 1770, + 11 Nov 1839 Klein Flintbek, oo Johann Jochim Kähler 17 Oct 1795.
3 children (known):
Hans Christian, * 23 Aug 1809, Klein Flintbek