feat(ci): add test coverage for reporter (Python/pytest)

- Enable pytest-cov for reporter tests with term + XML reports
- Add coverage regex and artifacts to reporter:tests job
- Add Reporter Coverage badge to README

Both CLI (Bun) and Reporter (Python) now have coverage badges.
Closes #74

Author: claude

.gitlab-ci.yml

@@ -81,7 +81,15 @@ reporter:tests:
     - pip install -r reporter/requirements-dev.txt
   script:
     - chown -R postgres:postgres "$CI_PROJECT_DIR"
-    - su - postgres -c "cd \"$CI_PROJECT_DIR\" && python -m pytest --run-integration tests/reporter"
+    - su - postgres -c "cd \"$CI_PROJECT_DIR\" && python -m pytest --run-integration --cov=reporter --cov-report=term --cov-report=xml:coverage/reporter-coverage.xml tests/reporter"
+    # Fix ownership for artifact collection
+    - chown -R root:root "$CI_PROJECT_DIR/coverage" || true
+  coverage: '/TOTAL\s+\d+\s+\d+\s+(\d+)%/'
+  artifacts:
+    when: always
+    paths:
+      - coverage/
+    expire_in: 7 days
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
 

README.md

@@ -4,6 +4,7 @@
 [![GitLab](https://img.shields.io/badge/GitLab-postgres--ai%2Fpostgres__ai-orange?logo=gitlab)](https://gitlab.com/postgres-ai/postgres_ai)
 [![PostgreSQL](https://img.shields.io/badge/PostgreSQL-14%2B-blue?logo=postgresql)](https://www.postgresql.org/)
 [![CLI Coverage](https://gitlab.com/postgres-ai/postgres_ai/badges/main/coverage.svg?job=cli:node:tests)](https://gitlab.com/postgres-ai/postgres_ai/-/jobs)
+[![Reporter Coverage](https://gitlab.com/postgres-ai/postgres_ai/badges/main/coverage.svg?job=reporter:tests)](https://gitlab.com/postgres-ai/postgres_ai/-/jobs)
 
 **Expert-level Postgres monitoring tool designed for humans and AI systems**