CodeSnippet is a code snippet that is posted by a user.

CodeSnippetRating is a rating for a code snippet.

CodeSnippetVersion is a code snippet version that is posted by a user.

Notification is a model for representing notifications for particular user in the system.

ProgramLanguage is a programming language that a code snippet is written in.

ReviewComment is a comment on a code snippet.

User is a user in the system.