add migration and entities for uploads upload_zk upload_hotlink.

backend/src/modules/upload/UploadModule.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Upload } from './entities/Upload';
+import { UploadHotlink } from './entities/UploadHotlink';
+import { UploadZk } from './entities/UploadZk';
+
+@Module({
+    imports: [TypeOrmModule.forFeature([Upload, UploadZk, UploadHotlink])]
+})
+export class UploadModule {}

backend/src/modules/upload/entities/Upload.ts

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+import { Column, CreateDateColumn, Entity, OneToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { UploadMode } from '../types/UploadMode';
+import { UploadHotlink } from './UploadHotlink';
+import { UploadZk } from './UploadZk';
+
+@Entity('uploads')
+export class Upload {
+    @PrimaryGeneratedColumn('uuid')
+    id: string;
+
+    @Column({ type: 'enum', enum: UploadMode })
+    mode: UploadMode;
+
+    @Column({ type: 'text' })
+    storagePath: string;
+
+    @Column({ type: 'bytea' })
+    iv: Buffer;
+
+    @Column({ type: 'int', nullable: true })
+    maxViews: number | null;
+
+    @Column({ type: 'int', default: 0 })
+    viewCount: number;
+
+    @Column()
+    deleteTokenHash: string;
+
+    @OneToOne(() => UploadZk, zk => zk.upload)
+    zk: UploadZk | null;
+
+    @OneToOne(() => UploadHotlink, hotlink => hotlink.upload)
+    hotlink: UploadHotlink | null;
+
+    @Column({ type: 'timestamptz', nullable: true })
+    lastViewedAt: Date | null;
+
+    @Column({ type: 'timestamptz', nullable: true })
+    expiresAt: Date | null;
+
+    @CreateDateColumn({ type: 'timestamptz' })
+    createdAt: Date;
+}

backend/src/modules/upload/entities/UploadHotlink.ts

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+import { Column, Entity, JoinColumn, OneToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { Upload } from './Upload';
+
+@Entity('upload_hotlink')
+export class UploadHotlink {
+    @PrimaryGeneratedColumn('uuid')
+    id: string;
+
+    @Column()
+    mimeType: string;
+
+    @OneToOne(() => Upload, upload => upload.hotlink, { onDelete: 'CASCADE' })
+    @JoinColumn()
+    upload: Upload;
+}

backend/src/modules/upload/entities/UploadZk.ts

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+import { Column, Entity, JoinColumn, OneToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { Upload } from './Upload';
+
+@Entity('upload_zk')
+export class UploadZk {
+    @PrimaryGeneratedColumn('uuid')
+    id: string;
+
+    @Column({ type: 'boolean', default: false })
+    passwordProtected: boolean;
+
+    @Column({ type: 'bytea', nullable: true })
+    wrappedDek: Buffer | null;
+
+    @Column({ type: 'bytea', nullable: true })
+    wrapIv: Buffer | null;
+
+    @Column({ type: 'bytea', nullable: true })
+    salt: Buffer | null;
+
+    @OneToOne(() => Upload, upload => upload.zk, { onDelete: 'CASCADE' })
+    @JoinColumn()
+    upload: Upload;
+}

backend/src/modules/upload/types/UploadMode.ts

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+export enum UploadMode {
+    Zk = 'zk',
+    Hotlink = 'hotlink'
+}