v0.14.0

• Database connection pool. Set DATABASE_POOL=1 in .env to reuse
  Postgres connections through psycopg's connection pool, with at most
  DATABASE_POOL_SIZE (4) connections per backend process. The server
  extra of django-stack now installs psycopg[pool]; dstack update
  brings it into an existing project.

Fixes

• Fixed: under traffic, Postgres refused connections with
  FATAL: sorry, too many clients already and pages answered 500. Django
  kept every connection for 60 seconds, but under ASGI each request runs
  in a new thread, so a kept connection was never reused and they piled
  up past Postgres's 100. DATABASE_URL now sets CONN_MAX_AGE to 0:
  each request closes its connection when it ends. Run dstack update to
  get the new django-stack, and remove a
  DATABASES["default"]["CONN_MAX_AGE"] = 0 workaround from
  settings.py if you added one. (#94)
• Fixed: when a page failed to render, such as when the database was
  down, the Astro frontend answered with an empty 500 without a
  Content-Type, which iOS Safari offered as a file download. New Astro
  projects get src/pages/500.astro and new Next.js projects
  src/app/global-error.tsx: error pages that call no API, so they show
  even when the backend fails. dstack update adds the page to an existing project
  that has none.
• Fixed: manage.py wait_for_db with DATABASE_POOL=1 hid a wrong
  password behind a 30-second pool timeout; it now connects without the
  pool and reports it at once.