Event search not having a timestamp causing issues

Hi,

This line:

https://github.com/CrowdStrike/MISP-tools/blob/d19f41db5653e546b8173c22988bdcdcfce086fb/cs_misp_import/indicator_family.py#L29

Does not specify a timestamp, our misp-tools instance was working fine until the event count became too much. adding timestamp="30d" resolved it for us. Can you add a configurable parameter for this?