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There are 3 types of User (Parent,Teacher,Student) Parent can see their Students, and their Student's teachers.
student can see their Parent, and their teachers. Teacher can see all their students, along with their parents. All users have the same atributes (User table).
Each User has one or zero photo (profile pic). A Photo can have many users ??? (that does not sound right)
Activities will have one photo. Same photo can be used for many activities. (Category does not have a photo. that is wrong in the category table.)
Each Activity can have only one Category. A Category can be in one or many Activities.
A Comment can have only one Category. A Category can have many Comments.
A Comment can have only one Activity. An Activity can have many Comments.
A Comment can have only one Risk. A Risk can have many Comments.
An Activity can have Many Alerts. An Alert can have many Activities.
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