Reorganize project. Add folder for shared code between backend/dashboard. Switch from jest to ava for tests.

backend/src/data/entities/StarboardMessage.ts

@@ -0,0 +1,25 @@
+import { Entity, Column, PrimaryColumn, OneToMany, ManyToOne, JoinColumn, OneToOne } from "typeorm";
+import { Starboard } from "./Starboard";
+import { Case } from "./Case";
+import { SavedMessage } from "./SavedMessage";
+
+@Entity("starboard_messages")
+export class StarboardMessage {
+  @Column()
+  @PrimaryColumn()
+  starboard_id: number;
+
+  @Column()
+  @PrimaryColumn()
+  message_id: string;
+
+  @Column() starboard_message_id: string;
+
+  @ManyToOne(type => Starboard, sb => sb.starboardMessages)
+  @JoinColumn({ name: "starboard_id" })
+  starboard: Starboard;
+
+  @OneToOne(type => SavedMessage)
+  @JoinColumn({ name: "message_id" })
+  message: SavedMessage;
+}