Try with a little more complexity

sonar-project.properties

@@ -1,13 +1,25 @@
 sonar.projectKey=paperless-ngx_paperless-ngx
 sonar.organization=paperless-ngx
+sonar.projectName=Paperless-ngx
+sonar.projectVersion=1.0
 
+# Source and test directories
+sonar.sources=src/,src-ui/src/
+sonar.tests=src/,src-ui/src/
+sonar.test.inclusions=**/test_*.py,**/tests.py,**/*.spec.ts,**/*.test.ts
 
-# This is the name and version displayed in the SonarCloud UI.
-sonar.projectName=paperless-ngx
-#sonar.projectVersion=1.0
+# Language specific settings
+sonar.python.version=3.10,3.11,3.12,3.13
 
-# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
-sonar.sources=.
-sonar.python.coverage.reportPaths=coverage.xml
-sonar.python.version=3.10, 3.11, 3.12, 3.13
-sonar.javascript.lcov.reportPaths=./coverage/lcov.info
+# Coverage reports
+sonar.python.coverage.reportPaths=merged-backend-coverage.xml
+sonar.javascript.lcov.reportPaths=lcov.info
+
+# Test execution reports
+sonar.junit.reportPaths=**/junit.xml,**/test-results.xml
+
+# Encoding
+sonar.sourceEncoding=UTF-8
+
+# Exclusions
+sonar.exclusions=**/migrations/**,**/node_modules/**,**/static/**,**/venv/**,**/.venv/**,**/dist/**