Sessions, password reset tokens and pending registrations live in the
database, so running more than one replica needs a shared one. With
DATABASE_HOST set the app uses PostgreSQL (psycopg 3 binary wheels, no
system libraries) with persistent, health-checked connections.
Otherwise SQLite is used, at a path configurable with SQLITE_PATH so a
single replica can keep it on a volume.
docker-compose.dev.yml gains a PostgreSQL 18 service on
localhost:5433. The full test suite passes on SQLite and PostgreSQL.
Alpine 3.24 based slapd with the production directory layout
(dc=ungleich,dc=ch, ou=customers, ou=users) and the openssh-lpk schema.
The app runs natively against it on ldap://localhost:3389.
Includes dev/env.dev with dev-only settings (cp dev/env.dev .env).
