AuthorEntity: Add missing properties

This adds the missing properties according to the DB PlantUML schema

Signed-off-by: David Mehren <git@herrmehren.de>

src/authors/author.entity.ts

@@ -4,14 +4,54 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Entity, PrimaryGeneratedColumn } from 'typeorm';
+import {
-import { Note } from '../notes/note.entity';
+  Column,
+  Entity,
+  ManyToOne,
+  OneToMany,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+import { Authorship } from '../revisions/authorship.entity';
+import { Session } from '../users/session.entity';
+import { User } from '../users/user.entity';
 
+export type AuthorColor = number;
+
+/**
+ * The author represents a single user editing a note.
+ * A 'user' can either be a registered and logged-in user or a browser session identified by its cookie.
+ * All edits (aka authorships) of one user in a note must belong to the same author, so that the same color can be displayed.
+ */
 @Entity()
 export class Author {
-  //TODO: Still missing many properties
   @PrimaryGeneratedColumn()
   id: number;
 
-  note: Note;
+  /**
+   * The id of the color of this author
+   * The application maps the id to an actual color
+   */
+  @Column({ type: 'int' })
+  color: AuthorColor;
+
+  /**
+   * A list of (browser) sessions this author has
+   * Only contains sessions for anonymous users, which don't have a user set
+   */
+  @OneToMany(() => Session, (session) => session.author)
+  sessions: Session[];
+
+  /**
+   * User that this author corresponds to
+   * Only set when the user was identified (by a browser session) as a registered user at edit-time
+   */
+  @ManyToOne(() => User, (user) => user.authors, { nullable: true })
+  user: User | null;
+
+  /**
+   * List of authorships that this author created
+   * All authorships must belong to the same note
+   */
+  @OneToMany(() => Authorship, (authorship) => authorship.author)
+  authorships: Authorship[];
 }