- Exists a Team
- Exists a Users
- Exists a Sprints
- Exists a Topic
- Exists one or more owner of Team
- A Team can grouper a or more users
- A owner can be invite more users for own Team
- A topic is any generic for vote
- Users can be votes in topics
- id
- name
- id
- name
- password
- id
- name
- date_init
- date_end
- sprint_id
- topic_id
- sprint_id
- team_id
- id
- name
- description
- point
- team_id
- team_id
- user_id
- is_owner
- team_id
- who_invite
- expires
- secret_invite
- id
- name
- expires
- id
- topic_id
- session_id