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

src/app/services/waiting-service-judges.service.ts

@@ -0,0 +1,70 @@
+import { Injectable } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { db } from 'db';
+import { liveQuery } from 'dexie';
+import { from } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class WaitingServiceJudgesService {
+  /**
+   * Reactive list sorted by order
+   */
+  readonly waitingServiceJudges = toSignal(
+    from(liveQuery(() => db.waitingServiceJudges.orderBy('order').toArray())),
+    {
+      initialValue: []
+    }
+  );
+
+  /**
+   * Add new umpire to queue with max(order) + 1
+   */
+  async add(serviceJudgeId: number): Promise<number> {
+    return db.transaction('rw', db.waitingServiceJudges, async () => {
+      const last = await db.waitingServiceJudges.orderBy('order').last();
+
+      const nextOrder = last ? last.order + 1 : 1;
+
+      return db.waitingServiceJudges.add({
+        serviceJudgeId,
+        order: nextOrder
+      });
+    });
+  }
+
+  /**
+   * Remove from queue
+   */
+  async remove(id: number): Promise<void> {
+    await db.waitingServiceJudges.delete(id);
+  }
+
+  async removeByUmpireId(umpireId: number): Promise<void> {
+    const item = await db.waitingServiceJudges
+      .where('serviceJudgeId')
+      .equals(umpireId)
+      .first();
+
+    if (!item?.id) {
+      return;
+    }
+
+    await db.waitingServiceJudges.delete(item.id);
+  }
+
+  /**
+   * Reorder (optional helper)
+   */
+  async updateOrder(id: number, order: number): Promise<void> {
+    await db.waitingServiceJudges.update(id, { order });
+  }
+
+  /**
+   * Clear queue
+   */
+  async clear(): Promise<void> {
+    await db.waitingServiceJudges.clear();
+  }
+}