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doc/DATABASE.md

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+# Database Design
+```mermaid
+erDiagram
+	Authors }o--|| Articles : Author
+	Tagging }o--|| Tags : Tag
+	Tagging }o--|| Articles : Article
+	Articles ||--|| Posts : Last_Post
+	Articles ||--o{ Posts : Main_Article
+
+	Articles {
+		INTEGER rowid PK "Article, Main_Article"
+		TEXT(128) title
+		TEXT(512) description
+		TIMESTAMP timestamp
+		BOOLEAN public
+		INTEGER author_id FK "Author"
+		INTEGER lastpost_id FK "Last_Post"
+	}
+
+	Authors {
+		INTEGER rowid PK "Author"
+		TEXT(32) sub
+		TEXT(32) iss
+		TEXT(64) username
+	}
+
+	Tags {
+		INTEGER rowid PK "Tag"
+		TEXT(32) title
+	}
+
+	Tagging {
+		INTEGER rowid PK
+		INTEGER tag_id FK "Tag"
+		INTEGER article_id FK "Article"
+	}
+
+	Posts {
+		INTEGER rowid PK "Last_Post"
+		INTEGER article_id FK "Main_Article"
+		TIMESTAMP timestamp
+		TEXT(5000) body
+	}
+```