umpires can be added to courts as umpires (removal also)

src/app/services/court.service.judge.service.ts

@@ -0,0 +1,48 @@
+import { Injectable } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { CourtServiceJudge, db } from 'db';
+import { liveQuery } from 'dexie';
+import { from } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class CourtServiceJudgeService {
+  /**
+   * All service judges (reactive)
+   */
+  readonly umpires = toSignal(
+    from(liveQuery(() => db.courtServiceJudges.orderBy('courtNo').toArray())),
+    { initialValue: [] }
+  );
+
+  /**
+   * Get by court number (reactive)
+   */
+  getByCourtNo(courtNo: number) {
+    return toSignal<CourtServiceJudge | undefined>(
+      liveQuery(() =>
+        db.courtServiceJudges.where('courtNo').equals(courtNo).first()
+      ),
+      { initialValue: undefined }
+    );
+  }
+
+  /**
+   * Create / update
+   */
+  async save(item: Omit<CourtServiceJudge, 'id'>): Promise<number> {
+    return db.courtServiceJudges.add(item as CourtServiceJudge);
+  }
+
+  async update(
+    id: number,
+    changes: Partial<CourtServiceJudge>
+  ): Promise<number> {
+    return db.courtServiceJudges.update(id, changes);
+  }
+
+  async delete(id: number): Promise<void> {
+    await db.courtServiceJudges.delete(id);
+  }
+}