diff --git a/.github/workflows/api-tests.yml b/.github/workflows/api-tests.yml
index c1da73b5df..7bce056970 100644
--- a/.github/workflows/api-tests.yml
+++ b/.github/workflows/api-tests.yml
@@ -14,11 +14,11 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  test:
-    name: API Tests
+  api-unit:
+    name: API Unit Tests
     runs-on: ubuntu-latest
     env:
-      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      COVERAGE_FILE: coverage-unit
     defaults:
       run:
         shell: bash
@@ -50,6 +50,52 @@ jobs:
       - name: Run dify config tests
         run: uv run --project api dev/pytest/pytest_config_tests.py
 
+      - name: Run Unit Tests
+        run: uv run --project api bash dev/pytest/pytest_unit_tests.sh
+
+      - name: Upload unit coverage data
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
+        with:
+          name: api-coverage-unit
+          path: coverage-unit
+          retention-days: 1
+
+  api-integration:
+    name: API Integration Tests
+    runs-on: ubuntu-latest
+    env:
+      COVERAGE_FILE: coverage-integration
+      STORAGE_TYPE: opendal
+      OPENDAL_SCHEME: fs
+      OPENDAL_FS_ROOT: /tmp/dify-storage
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      matrix:
+        python-version:
+          - "3.12"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Setup UV and Python
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+        with:
+          enable-cache: true
+          python-version: ${{ matrix.python-version }}
+          cache-dependency-glob: api/uv.lock
+
+      - name: Check UV lockfile
+        run: uv lock --project api --check
+
+      - name: Install dependencies
+        run: uv sync --project api --dev
+
       - name: Set up dotenvs
         run: |
           cp docker/.env.example docker/.env
@@ -73,22 +119,90 @@ jobs:
         run: |
           cp api/tests/integration_tests/.env.example api/tests/integration_tests/.env
 
-      - name: Run API Tests
-        env:
-          STORAGE_TYPE: opendal
-          OPENDAL_SCHEME: fs
-          OPENDAL_FS_ROOT: /tmp/dify-storage
+      - name: Run Integration Tests
         run: |
           uv run --project api pytest \
             -n auto \
             --timeout "${PYTEST_TIMEOUT:-180}" \
             api/tests/integration_tests/workflow \
             api/tests/integration_tests/tools \
-            api/tests/test_containers_integration_tests \
-            api/tests/unit_tests
+            api/tests/test_containers_integration_tests
+
+      - name: Upload integration coverage data
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
+        with:
+          name: api-coverage-integration
+          path: coverage-integration
+          retention-days: 1
+
+  api-coverage:
+    name: API Coverage
+    runs-on: ubuntu-latest
+    needs:
+      - api-unit
+      - api-integration
+    env:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      COVERAGE_FILE: .coverage
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Setup UV and Python
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+        with:
+          enable-cache: true
+          python-version: "3.12"
+          cache-dependency-glob: api/uv.lock
+
+      - name: Install dependencies
+        run: uv sync --project api --dev
+
+      - name: Download coverage data
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: coverage-data
+          pattern: api-coverage-*
+          merge-multiple: true
+
+      - name: Combine coverage
+        run: |
+          set -euo pipefail
+
+          echo "### API Coverage" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          echo "Merged backend coverage report generated for Codecov project status." >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+
+          unit_coverage="$(find coverage-data -type f -name coverage-unit -print -quit)"
+          integration_coverage="$(find coverage-data -type f -name coverage-integration -print -quit)"
+          : "${unit_coverage:?coverage-unit artifact not found}"
+          : "${integration_coverage:?coverage-integration artifact not found}"
+
+          report_file="$(mktemp)"
+          uv run --project api coverage combine "$unit_coverage" "$integration_coverage"
+          uv run --project api coverage report --show-missing | tee "$report_file"
+          echo "Summary: \`$(tail -n 1 "$report_file")\`" >> "$GITHUB_STEP_SUMMARY"
+          {
+            echo ""
+            echo "<details><summary>Coverage report</summary>"
+            echo ""
+            echo '```'
+            cat "$report_file"
+            echo '```'
+            echo "</details>"
+          } >> "$GITHUB_STEP_SUMMARY"
+          uv run --project api coverage xml -o coverage.xml
 
       - name: Report coverage
-        if: ${{ env.CODECOV_TOKEN != '' && matrix.python-version == '3.12' }}
+        if: ${{ env.CODECOV_TOKEN != '' }}
         uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad # v5.5.3
         with:
           files: ./coverage.xml
diff --git a/dev/pytest/pytest_unit_tests.sh b/dev/pytest/pytest_unit_tests.sh
index a034083304..1d4ff4d86f 100755
--- a/dev/pytest/pytest_unit_tests.sh
+++ b/dev/pytest/pytest_unit_tests.sh
@@ -13,4 +13,4 @@ PYTEST_XDIST_ARGS="${PYTEST_XDIST_ARGS:--n auto}"
 pytest --timeout "${PYTEST_TIMEOUT}" ${PYTEST_XDIST_ARGS} api/tests/unit_tests --ignore=api/tests/unit_tests/controllers
 
 # Run controller tests sequentially to avoid import race conditions
-pytest --timeout "${PYTEST_TIMEOUT}" api/tests/unit_tests/controllers
+pytest --timeout "${PYTEST_TIMEOUT}" --cov-append api/tests/unit_tests/controllers