leden/entities: fix typo in ensure_indices
Merge branch 'master' of https://github.com/karpenoktem/kninfra
entities: add index on person.dateOfBirth

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
entities: add by_year_of_birth

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
smoelen: revive bouwjaar

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>