fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/users/session.entity.ts

@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { ISession } from 'connect-typeorm';
+import {
+  Column,
+  DeleteDateColumn,
+  Entity,
+  Index,
+  ManyToOne,
+  PrimaryColumn,
+} from 'typeorm';
+
+import { Author } from '../authors/author.entity';
+
+@Entity()
+export class Session implements ISession {
+  @PrimaryColumn('varchar', { length: 255 })
+  public id = '';
+
+  @Index()
+  @Column('bigint')
+  public expiredAt = Date.now();
+
+  @Column('text')
+  public json = '';
+
+  @DeleteDateColumn()
+  public destroyedAt?: Date;
+
+  @ManyToOne(() => Author, (author) => author.sessions)
+  author: Promise<Author>;
+}