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

backend/src/data/BaseRepository.ts

@@ -0,0 +1,30 @@
+export class BaseRepository {
+  private nextRelations: string[];
+
+  constructor() {
+    this.nextRelations = [];
+  }
+
+  /**
+   * Primes the specified relation(s) to be used in the next database operation.
+   * Can be chained.
+   */
+  public with(relations: string | string[]): this {
+    if (Array.isArray(relations)) {
+      this.nextRelations.push(...relations);
+    } else {
+      this.nextRelations.push(relations);
+    }
+
+    return this;
+  }
+
+  /**
+   * Gets and resets the relations primed using with()
+   */
+  protected getRelations(): string[] {
+    const relations = this.nextRelations || [];
+    this.nextRelations = [];
+    return relations;
+  }
+}