diff --git a/resources/js/services/transaction-sync.test.ts b/resources/js/services/transaction-sync.test.ts
new file mode 100644
index 00000000..f04f8b0e
--- /dev/null
+++ b/resources/js/services/transaction-sync.test.ts
@@ -0,0 +1,55 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { transactionSyncService } from './transaction-sync';
+
+const dbMock = vi.hoisted(() => ({
+    transactions: {
+        delete: vi.fn(async () => undefined),
+    },
+    sync_metadata: { delete: vi.fn(), get: vi.fn(), put: vi.fn() },
+}));
+
+const axiosMock = vi.hoisted(() => ({
+    delete: vi.fn(async () => ({ data: {} })),
+}));
+
+// Keep the real withDb (reads globalThis live); swap only the Dexie-backed db.
+vi.mock('@/lib/dexie-db', async (importOriginal) => {
+    const actual = await importOriginal<typeof import('@/lib/dexie-db')>();
+    return { ...actual, db: dbMock };
+});
+
+vi.mock('axios', () => ({ default: axiosMock }));
+
+describe('transactionSyncService.delete', () => {
+    beforeEach(() => {
+        vi.clearAllMocks();
+    });
+
+    afterEach(() => {
+        vi.unstubAllGlobals();
+    });
+
+    it('deletes via the API but skips the cache eviction when IndexedDB is missing', async () => {
+        vi.stubGlobal('indexedDB', undefined);
+
+        await expect(
+            transactionSyncService.delete('txn-1'),
+        ).resolves.toBeUndefined();
+
+        expect(axiosMock.delete).toHaveBeenCalledWith('/transactions/txn-1', {
+            data: undefined,
+        });
+        expect(dbMock.transactions.delete).not.toHaveBeenCalled();
+    });
+
+    it('deletes via the API and evicts the cache when IndexedDB is available', async () => {
+        vi.stubGlobal('indexedDB', {} as IDBFactory);
+
+        await transactionSyncService.delete('txn-1');
+
+        expect(axiosMock.delete).toHaveBeenCalledWith('/transactions/txn-1', {
+            data: undefined,
+        });
+        expect(dbMock.transactions.delete).toHaveBeenCalledWith('txn-1');
+    });
+});
diff --git a/resources/js/services/transaction-sync.ts b/resources/js/services/transaction-sync.ts
index 3dbd5992..61983d9b 100644
--- a/resources/js/services/transaction-sync.ts
+++ b/resources/js/services/transaction-sync.ts
@@ -1,4 +1,4 @@
-import { db } from '@/lib/dexie-db';
+import { db, withDb } from '@/lib/dexie-db';
 import { TransactionSyncManager } from '@/lib/sync-manager';
 import type { LearnedRuleNotice } from '@/types/automation-rule';
 import type { Transaction } from '@/types/transaction';
@@ -192,7 +192,11 @@ class TransactionSyncService {
         await axios.delete(`/transactions/${id}`, {
             data: options?.updateBalance ? { update_balance: true } : undefined,
         });
-        await db.transactions.delete(id);
+        // The API delete above is authoritative; the local cache eviction is
+        // best-effort and skipped when IndexedDB is unavailable (PHP-LARAVEL-43).
+        await withDb<void>(async () => {
+            await db.transactions.delete(id);
+        }, undefined);
     }
 
     async updateManyIndividual(