Reduce DB connection leaks

api/compose/django/server.sh

 #!/bin/bash -eux
 python /app/manage.py collectstatic --noinput
-gunicorn config.asgi:application -w ${FUNKWHALE_WEB_WORKERS-1} -k uvicorn.workers.UvicornWorker -b 0.0.0.0:5000
+gunicorn config.asgi:application -w ${FUNKWHALE_WEB_WORKERS-1} -k uvicorn.workers.UvicornWorker -b 0.0.0.0:5000 ${GUNICORN_ARGS-}

api/config/asgi.py

 import os
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.production")
+os.environ.setdefault("ASGI_THREADS", "5")
 
 import django  # noqa
 

api/config/settings/common.py

@@ -270,7 +270,7 @@ DATABASES = {
     "default": env.db("DATABASE_URL")
 }
 DATABASES["default"]["ATOMIC_REQUESTS"] = True
-DATABASES["default"]["CONN_MAX_AGE"] = env("DB_CONN_MAX_AGE", default=60 * 60)
+DATABASES["default"]["CONN_MAX_AGE"] = env("DB_CONN_MAX_AGE", default=60 * 5)
 
 MIGRATION_MODULES = {
     # see https://github.com/jazzband/django-oauth-toolkit/issues/634

changes/changelog.d/db.enhancement

+Reduce the number of simultaneous DB connections under some deployment scenario