Add /health/ endpoint and curl for Docker healthchecks

- Add health view checking DB connection at /health/
- Add curl to Dockerfile.prod for container healthcheck support

docker/Dockerfile.prod

@@ -14,6 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
     libpq-dev \
     netcat-openbsd \
+    curl \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Python dependencies

locflow/urls.py

@@ -4,9 +4,10 @@ from django.contrib import admin
 from django.urls import path, include
 from drf_spectacular.views import SpectacularAPIView
 
-from locflow.views import swagger_ui
+from locflow.views import health, swagger_ui
 
 urlpatterns = [
+    path('health/', health, name='health'),
     path('admin/', admin.site.urls),
     path('api/v1/', include('apps.accounts.urls')),
     path('api/v1/', include('apps.projects.urls')),

locflow/views.py

@@ -1,6 +1,13 @@
+import logging
+
 from django.conf import settings
+from django.db import connection
+from django.http import JsonResponse
 from django.shortcuts import render
 from django.urls import reverse
+from django.views.decorators.cache import never_cache
+
+logger = logging.getLogger(__name__)
 
 
 def swagger_ui(request):
@@ -8,3 +15,19 @@ def swagger_ui(request):
         'schema_url': reverse('schema'),
         'umami_website_id': getattr(settings, 'UMAMI_WEBSITE_ID', ''),
     })
+
+
+@never_cache
+def health(request):
+    db_ok = False
+    try:
+        connection.ensure_connection()
+        db_ok = True
+    except Exception:
+        logger.warning("Health check: database connection failed")
+
+    status_code = 200 if db_ok else 503
+    return JsonResponse(
+        {"status": "ok" if db_ok else "degraded", "db": db_ok},
+        status=status_code,
+    )