feat(umpires): move umpires between 3 lists by drag-and-drop

src/app/services/settings-service.ts

@@ -0,0 +1,46 @@
+import { Injectable } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { db, Settings } from 'db';
+import { liveQuery } from 'dexie';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class SettingsService {
+  constructor() {
+    void this.ensureSettings();
+  }
+
+  /**
+   * Reactive settings signal
+   */
+  readonly settings = toSignal<Settings | undefined>(
+    liveQuery(() => db.settings.get(1)),
+    { initialValue: undefined }
+  );
+
+  /**
+   * Update settings
+   */
+  async update(changes: Partial<Omit<Settings, 'id'>>): Promise<void> {
+    const current = await db.settings.get(1);
+
+    if (!current) {
+      return;
+    }
+
+    await db.settings.update(1, changes);
+  }
+
+  private async ensureSettings() {
+    const existing = await db.settings.get(1);
+
+    if (!existing) {
+      await db.settings.put({
+        id: 1,
+        numberOfCourts: 5,
+        withServiceJudge: true
+      });
+    }
+  }
+}