diff --git a/frontends/nextjs/src/lib/db/error-logs/tests/add-error-log.test.ts b/frontends/nextjs/src/lib/db/error-logs/tests/add-error-log.test.ts
new file mode 100644
index 000000000..037fccbec
--- /dev/null
+++ b/frontends/nextjs/src/lib/db/error-logs/tests/add-error-log.test.ts
@@ -0,0 +1,56 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+const mockCreate = vi.fn()
+const mockAdapter = { create: mockCreate }
+
+vi.mock('../../core/dbal-client', () => ({
+  getAdapter: () => mockAdapter,
+}))
+
+import { addErrorLog } from '../crud/add-error-log'
+
+describe('addErrorLog', () => {
+  beforeEach(() => {
+    mockCreate.mockReset()
+  })
+
+  it.each([
+    {
+      name: 'minimal error log',
+      log: {
+        timestamp: Date.now(),
+        level: 'error' as const,
+        message: 'Test error',
+        resolved: false,
+      },
+    },
+    {
+      name: 'complete error log',
+      log: {
+        timestamp: Date.now(),
+        level: 'error' as const,
+        message: 'Test error',
+        stack: 'Error: Test error\n  at test.ts:10',
+        context: '{"key":"value"}',
+        userId: 'user_1',
+        username: 'testuser',
+        tenantId: 'tenant_1',
+        source: 'test.ts',
+        resolved: false,
+      },
+    },
+  ])('should add $name', async ({ log }) => {
+    mockCreate.mockResolvedValue(undefined)
+
+    const id = await addErrorLog(log)
+
+    expect(mockCreate).toHaveBeenCalledWith('ErrorLog', expect.objectContaining({
+      id: expect.stringContaining('error_'),
+      timestamp: expect.any(BigInt),
+      level: log.level,
+      message: log.message,
+      resolved: false,
+    }))
+    expect(id).toMatch(/^error_/)
+  })
+})
diff --git a/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts b/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts
new file mode 100644
index 000000000..45b8dfff2
--- /dev/null
+++ b/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts
@@ -0,0 +1,91 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+const mockList = vi.fn()
+const mockAdapter = { list: mockList }
+
+vi.mock('../../core/dbal-client', () => ({
+  getAdapter: () => mockAdapter,
+}))
+
+import { getErrorLogs } from '../crud/get-error-logs'
+
+describe('getErrorLogs', () => {
+  beforeEach(() => {
+    mockList.mockReset()
+  })
+
+  it.each([
+    {
+      name: 'empty array when no logs',
+      dbData: [],
+      options: undefined,
+      expectedLength: 0,
+    },
+    {
+      name: 'all error logs',
+      dbData: [
+        {
+          id: 'error_1',
+          timestamp: BigInt(Date.now()),
+          level: 'error',
+          message: 'Test error',
+          stack: 'Error: Test error',
+          context: null,
+          userId: null,
+          username: null,
+          tenantId: null,
+          source: 'test.ts',
+          resolved: false,
+          resolvedAt: null,
+          resolvedBy: null,
+        },
+      ],
+      options: undefined,
+      expectedLength: 1,
+    },
+    {
+      name: 'filtered by level',
+      dbData: [
+        {
+          id: 'error_1',
+          timestamp: BigInt(Date.now()),
+          level: 'error',
+          message: 'Test error',
+          stack: null,
+          context: null,
+          userId: null,
+          username: null,
+          tenantId: null,
+          source: null,
+          resolved: false,
+          resolvedAt: null,
+          resolvedBy: null,
+        },
+        {
+          id: 'warning_1',
+          timestamp: BigInt(Date.now()),
+          level: 'warning',
+          message: 'Test warning',
+          stack: null,
+          context: null,
+          userId: null,
+          username: null,
+          tenantId: null,
+          source: null,
+          resolved: false,
+          resolvedAt: null,
+          resolvedBy: null,
+        },
+      ],
+      options: { level: 'error' },
+      expectedLength: 1,
+    },
+  ])('should return $name', async ({ dbData, options, expectedLength }) => {
+    mockList.mockResolvedValue({ data: dbData })
+
+    const result = await getErrorLogs(options)
+
+    expect(mockList).toHaveBeenCalledWith('ErrorLog')
+    expect(result).toHaveLength(expectedLength)
+  })
+})