Dynamics 365 CRM version 9.1

Hi! I am reaching out to confirm some technical details regarding Dynamics 365 CRM version 9.1. Specifically, I would like to verify the following:

1. Maximum Number of Fields per Entity: what is the maximum number of fields allowed per entity in Dynamics 365 CRM version 9.1, including both system and custom fields?
2. Maximum Size of a Single Record: what is the maximum size (in bytes) permitted for a single record within an entity?

I am currently managing an upgrade from version 8.1 to 9.1 and need to ensure our data and customizations are compliant with these limits to avoid any issues during the migration process.

If it’s better to ask this question in a different section, please redirect me. Unfortunately, I couldn’t find technical support, mayby you know where is it? 

Thank you in advance for your help.