{
  config,
  lib,
  ...
}:
let
  pgsqlEnable = config.machine.postgresql.enable;
  inherit (config.machine.synapse) enable;
in
with lib; mkIf enable {
  services.postgresql = with lib; mkIf pgsqlEnable {
    ensureUsers = [
      {
        name = "matrix-synapse";
        ensureDBOwnership = true;
      }
    ];
    ensureDatabases = [ "matrix-synapse" ];
  };
  services.matrix-synapse.settings.database = {
    name = if pgsqlEnable then "psycopg2" else "sqlite3";
    args = with lib; mkIf pgsqlEnable {
      host = "/run/postgresql";
    };
  };
}