Hi @ruimartins,
We are able to query using startDate: https://cdn.builder.io/api/v2/content/wissenswelt-poll?apiKey=6bdfd3f286da46e1a72110ce56bd844c&query.startDate.$eq=null
Looks like you have not set startDate or endDate for both the content associated with wissenswelt-poll model. Kindly try to set the startDate and then publish the content to query using startDate.
This also seems to work
https://cdn.builder.io/api/v2/content/wissenswelt-poll?apiKey=6bdfd3f286da46e1a72110ce56bd844c&query.createdDate.$lte=1666686608053