{ makeSystem
, nixpkgs
}:
makeSystem {
  system = "x86_64-linux";
  name = "nixng-synapse-postgresql";
  inherit nixpkgs;
  config =
    { pkgs, config, ... }:
    {
      config = {
        dumb-init = {
          enable = true;
          type.services = {};
        };
        services.postgresql = {
          enable = true;
          package = pkgs.postgresql_12;

          initialScript = "/secrets/init.sql";
          enableTCPIP = true;

          authentication = "host  all all all          md5";

          config = {
            max_connections = 70;
            shared_buffers = "384MB";
            effective_cache_size = "1152MB";
            maintenance_work_mem = "96MB";
            checkpoint_completion_target = "0.9";
            wal_buffers = "11796kB";
            default_statistics_target = 100;
            random_page_cost = 4;
            effective_io_concurrency = 2;
            work_mem = "1966kB";
            min_wal_size = "1GB";
            max_wal_size = "4GB";
            max_worker_processes = 24;
            max_parallel_workers_per_gather = 4;
            max_parallel_workers = 24;
            max_parallel_maintenance_workers = 4;
          };

          ensureDatabases = {
            "synapse" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
            "mautrix-facebook" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
            "mautrix-signal" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
            "mautrix-whatsapp" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
            "mautrix-discord" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
            "mautrix-slack" = { ENCODING = "UTF8"; TEMPLATE = "template0"; };
          };
          ensureExtensions = {};
          ensureUsers = [
            {
              name = "synapse";
              ensurePermissions."DATABASE \"synapse\"" = "ALL PRIVILEGES";
            }
            {
              name = "mautrix-facebook";
              ensurePermissions."DATABASE \"mautrix-facebook\"" = "ALL PRIVILEGES";
            }
            {
              name = "mautrix-signal";
              ensurePermissions."DATABASE \"mautrix-signal\"" = "ALL PRIVILEGES";
            }
            {
              name = "mautrix-whatsapp";
              ensurePermissions."DATABASE \"mautrix-whatsapp\"" = "ALL PRIVILEGES";
            }
            {
              name = "mautrix-discord";
              ensurePermissions."DATABASE \"mautrix-discord\"" = "ALL PRIVILEGES";
            }
            {
              name = "mautrix-slack";
              ensurePermissions."DATABASE \"mautrix-slack\"" = "ALL PRIVILEGES";
            }
          ];
        };
      };
    };
}