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.github/workflows/sonarcloud.yml

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+name: SonarCloud
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  sonarcloud:
+    name: SonarCloud Analysis
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # SonarCloud needs full history for accurate blame/new-code detection
+          fetch-depth: 0
+
+      # --- Backend: generate coverage.xml so Sonar can report Python coverage ---
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: backend/requirements-dev.txt
+
+      - name: Install backend dependencies
+        working-directory: backend
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run pytest with coverage
+        working-directory: backend
+        run: |
+          python -m pytest \
+            --cov=app \
+            --cov-report=xml \
+            -p no:warnings
+        # Don't fail the whole Sonar run just because a test flaked;
+        # Sonar will simply show stale/no coverage for this run instead.
+        continue-on-error: true
+
+      # --- Frontend: optional ESLint report for Sonar's JS/TS rules ---
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install frontend dependencies
+        working-directory: frontend
+        run: npm ci
+
+      - name: Run ESLint (JSON report for Sonar)
+        working-directory: frontend
+        run: npx eslint . --format json --output-file eslint-report.json
+        continue-on-error: true
+
+      # --- SonarCloud scan ---
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarqube-scan-action@v4
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}