Below are some answers regarding FaceStation 1 template sizes

Is a video saved in the Database?

FaceStation does not record any videos. Hence such information is not stored in the database. 

How large is a user template? 

A single face template is made up of 30 templates. 25 templates are the original template and 5 templates are templates that are updated when a better quality is scanned. 

Each template is 2KB and hence each face template will be 30 template x 2KB = 60KB. 

If you had 1000 users, and one face template for each user that would take 60KB x 1000 = 60000KB which would be 60MB.