feat: add remove method to SettlementRepository

src/repositories/settlementRepository.test.ts

@@ -48,4 +48,28 @@ describe("SettlementRepository", () => {
     expect(repo.byAnchor("anchorA")).toHaveLength(2);
     expect(repo.count()).toBe(3);
   });
+
+  describe("remove", () => {
+    it("removes an existing settlement and returns true", () => {
+      const repo = new SettlementRepository();
+      const s = repo.create(draft("anchorA", 100));
+      expect(repo.count()).toBe(1);
+
+      const result = repo.remove(s.id);
+      expect(result).toBe(true);
+      expect(repo.get(s.id)).toBeUndefined();
+      expect(repo.count()).toBe(0);
+      expect(repo.all()).toHaveLength(0);
+      expect(repo.byAnchor("anchorA")).toHaveLength(0);
+    });
+
+    it("returns false when removing a non-existent id", () => {
+      const repo = new SettlementRepository();
+      repo.create(draft("anchorA", 100));
+
+      const result = repo.remove(999);
+      expect(result).toBe(false);
+      expect(repo.count()).toBe(1);
+    });
+  });
 });

src/repositories/settlementRepository.ts

@@ -45,6 +45,22 @@ export class SettlementRepository extends InMemoryRepository<number, Settlement>
     return this.getByKey(id);
   }
 
+  /** Removes a settlement, returning `true` if one existed. */
+  remove(id: number): boolean {
+    const existing = this.getByKey(id);
+    const existed = this.removeByKey(id);
+    if (existed && existing) {
+      const anchorSet = this.anchorIndex.get(existing.anchor);
+      if (anchorSet) {
+        anchorSet.delete(id);
+        if (anchorSet.size === 0) {
+          this.anchorIndex.delete(existing.anchor);
+        }
+      }
+    }
+    return existed;
+  }
+
   /** Returns every settlement, most recent first. */
   all(): Settlement[] {
     return this.listAll().sort((a, b) => b.id - a.id);