{
  lib,
  config,
  ...
}: let
  usingPostgres = config.services.forgejo.database.type == "postgres";
in {
  config = lib.mkIf config.services.forgejo.enable {
    assertions = [
      {
        assertion = !usingPostgres || config.services.postgresql.enable;
        message = "PostgreSQL must be enabled when Forgejo database type is postgres";
      }
      {
        assertion = !(usingPostgres && config.services.forgejo.database.createDatabase) || (builtins.any (db: db == "forgejo") config.services.postgresql.ensureDatabases);
        message = "Forgejo built-in database creation failed - expected 'forgejo' in ensureDatabases but got: ${builtins.toString config.services.postgresql.ensureDatabases}";
      }
      {
        assertion = !(usingPostgres && config.services.forgejo.database.createDatabase) || (builtins.any (user: user.name == "forgejo") config.services.postgresql.ensureUsers);
        message = "Forgejo built-in user creation failed - expected user 'forgejo' in ensureUsers but got: ${builtins.toString (builtins.map (u: u.name) config.services.postgresql.ensureUsers)}";
      }
    ];

    services.forgejo.database.createDatabase = lib.mkDefault usingPostgres;

    systemd.services.forgejo = lib.mkIf usingPostgres {
      requires = [
        config.systemd.services.postgresql.name
      ];
    };
  };
}