test ht map to find checkins

Kind of works, but not really.
Revert "test ht map to find checkins"

This reverts commit 50715b528c3bb48101ce95da64dd70522b21ae98.
Revert "Revert "test ht map to find checkins""

This reverts commit 96025a78096fd51445ecdfe9bd0f719a4a39bd95.
Map added with markers from db.