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

backend/src/data/entities/PersistedData.ts

@@ -0,0 +1,18 @@
+import { Entity, Column, PrimaryColumn } from "typeorm";
+
+@Entity("persisted_data")
+export class PersistedData {
+  @Column()
+  @PrimaryColumn()
+  guild_id: string;
+
+  @Column()
+  @PrimaryColumn()
+  user_id: string;
+
+  @Column("simple-array") roles: string[];
+
+  @Column() nickname: string;
+
+  @Column() is_voice_muted: number;
+}