{
  flake,
  config,
  pkgs,
  lib,
  ...
}: let
  psCfg = config.pub-solar;
  xdg = config.home-manager.users."${psCfg.user.name}".xdg;
  backupDir = "/var/lib/invoiceplane/backup";
in {
  age.secrets."invoiceplane-db-password" = {
    file = "${flake.self}/secrets/invoiceplane-db-password.age";
    mode = "400";
    owner = "invoiceplane";
  };

  age.secrets."invoiceplane-db-secrets.env" = {
    file = "${flake.self}/secrets/invoiceplane-db-secrets.env.age";
    mode = "400";
  };

  security.acme.certs = {
    "invoicing.b12f.io" = {};
  };

  services.nginx.virtualHosts = {
    "invoicing.b12f.io" = {
      forceSSL = true;
      useACMEHost = "invoicing.b12f.io";
    };
  };

  services.invoiceplane.webserver = "nginx";
  services.invoiceplane.sites."invoicing.b12f.io" = {
    enable = true;

    database = {
      user = "invoiceplane";
      name = "invoiceplane";
      passwordFile = config.age.secrets."invoiceplane-db-password".path;
      host = "127.0.0.1";
      port = 3306;
      createLocally = false;
    };

    invoiceTemplates = [pkgs.invoiceplane-template];

    extraConfig = ''
      SETUP_COMPLETED=true
      DISABLE_SETUP=true
      IP_URL=https://invoicing.b12f.io
    '';

    poolConfig = {
      "pm" = "dynamic";
      "pm.max_children" = 32;
      "pm.max_requests" = 500;
      "pm.max_spare_servers" = 4;
      "pm.min_spare_servers" = 2;
      "pm.start_servers" = 2;
      "php_admin_value[error_log]" = "/var/lib/invoiceplane/invoicing.b12f.io/logs/php-error.log";
      "php_admin_flag[display_errors]" = "off";
      "php_admin_flag[log_errors]" = "on";
      "catch_workers_output" = "yes";
    };
  };

  virtualisation = {
    oci-containers = {
      backend = "docker";
      containers."invoiceplane-db" = {
        image = "mariadb:11";
        autoStart = true;
        ports = ["127.0.0.1:3306:3306"];
        volumes = [
          "/var/lib/invoiceplane/db:/var/lib/mysql"
        ];
        environmentFiles = [
          config.age.secrets."invoiceplane-db-secrets.env".path
        ];
      };
    };
  };

  systemd.tmpfiles.rules = [
    "d '${backupDir}' 0700 root root - -"
  ];

  services.restic.backups = {
    invoiceplane = {
      paths = [
        backupDir
        "/var/lib/invoiceplane/invoicing.b12f.io"
      ];
      initialize = true;
      passwordFile = config.age.secrets."restic-password".path;
      # See https://www.hosting.de/blog/verschluesselte-backups-mit-rclone-und-restic-in-nextcloud/
      repository = "rclone:cloud.pub.solar:/backups/InvoicePlane";
      backupPrepareCommand = ''
        PW=$(cat ${config.age.secrets."invoiceplane-db-password".path})
        ${pkgs.docker-client}/bin/docker exec -t invoiceplane-db mariadb-dump --all-databases --password=$PW --user=invoiceplane > "${backupDir}/postgres.sql"
      '';
      rcloneConfigFile = config.age.secrets."rclone-pubsolar.conf".path;
    };
  };
}