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feat: database design
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‎docs/database.md

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# Database design
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## Table design
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- User can create many Groups, Group can have many Users
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- User can be Editor, Moderator, Admin
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- User can create many Posts, Post can have many Comments and Images
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- User can create Comments on Posts
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- User can like, share, up vote, down vote a Post
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- User can Tag a Post
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- Tag have two type: Tag or Category
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- Tag can have many Images
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- Comments can be nested
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- Tag can be nested (Child & Parent relationship)
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- User can like, share, up vote, down vote, book mark, pin a Post
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- User can like, share, up vote, down vote a Comment
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- User can follow/unfollow other users
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- User can follow/unfollow a tag
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- Post can be STANDARD, ASIDE, GALLERY, LINK, IMAGE, QUOTE, STATUS, VIDEO, AUDIO, POLL
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- Post's status can be: DRAFT, PUBLISHED, ARCHIVED, TRASHED, BLOCKED
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- User's status can be: UNVERIFIED, VERIFIED, BLOCKED
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```mermaid
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erDiagram
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Post ||--o{ Comment : has
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Post ||--o{ TagOnPost : has
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Post ||--o{ PostOnUser : has
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User ||--o{ Post : creates
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User ||--o{ Comment : writes
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User ||--o{ PostOnUser : interacts
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User ||--o{ TagOnPost : tags
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Comment ||--o{ CommentOnUser : interacts
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Tag ||--o{ TagOnPost : has
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Image ||--o{ Post : contains
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Image ||--o{ Tag : contains
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User {
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String id PK
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String name
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String email UK
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String username UK
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String bio
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String password
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UserStatus userStatus
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}
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Group {
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String id PK
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String name UK
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String description
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String ownerId FK
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DateTime createdAt
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DateTime updatedAt
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DateTime deletedAt
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}
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UserOnGroup {
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String userId FK
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String groupId FK
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GroupRole role
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}
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Post {
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String id PK
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String title
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String content
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PostStatus postStatus
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String authorId FK
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DateTime createdAt
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DateTime updatedAt
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DateTime deletedAt
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}
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Comment {
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String id PK
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String content
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String authorId FK
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String commentOnPostId FK
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String parentCommentId FK
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DateTime createdAt
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DateTime updatedAt
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DateTime deletedAt
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}
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Tag {
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String id PK
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String name UK
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TagType type
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String parentTagId FK
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}
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Media {
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String id PK
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String path
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String name
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Int width
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Int height
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String format
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String previewUrl
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String caption
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String url
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String mime
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String userId FK
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}
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Account {
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String id PK
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String userId FK
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String provider
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String providerAccountId UK
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String refresh_token
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String access_token
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Int expires_at
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}
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Session {
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String id PK
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String sessionToken UK
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String userId FK
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DateTime expires
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}
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User ||--o{ Group : "creates"
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User ||--o{ UserOnGroup : "joins"
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Group ||--o{ UserOnGroup : "has"
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User ||--o{ Post : "writes"
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User ||--o{ Comment : "writes"
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Post ||--o{ Comment : "has"
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User ||--o{ PostOnUser : "interacts"
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Post ||--o{ PostOnUser : "receives"
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User ||--o{ CommentOnUser : "interacts"
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Comment ||--o{ CommentOnUser : "receives"
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User ||--o{ Follower : "follows"
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User ||--o{ Account : "has"
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User ||--o{ Session : "has"
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Post ||--o{ TagOnPost : "tagged_with"
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Tag ||--o{ TagOnPost : "tags"
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Tag ||--o{ UserOnTag : "followed_by"
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User ||--o{ UserOnTag : "follows"
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User ||--o{ Media : "uploads"
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Post ||--o{ Media : "contains"
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Tag ||--o{ Media : "has"
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```

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