Added modules for books & series.

backend/nestjs-seshat-api/src/books/entities/book-origin.entity.ts

@@ -0,0 +1,24 @@
+import { UUID } from 'crypto';
+import { BookOriginType } from 'src/shared/enums/book_origin_type';
+import { Column, Entity, JoinColumn, ManyToOne, OneToOne, PrimaryColumn, Unique } from 'typeorm';
+import { BookEntity } from './book.entity';
+
+@Entity("book_origins")
+@Unique(['bookOriginId', 'type', 'value'])
+export class BookOriginEntity {
+  @PrimaryColumn({ name: 'book_origin_id' })
+  readonly bookOriginId: UUID;
+
+  @Column({ name: 'book_id' })
+  readonly bookId: UUID;
+
+  @Column({ name: 'origin_type' })
+  type: BookOriginType;
+
+  @Column({ name: 'origin_value' })
+  value: string;
+
+  @OneToOne(type => BookEntity, book => book.metadata)
+  @JoinColumn({ name: 'book_id' })
+  book: BookEntity;
+}