A user account which has Study/Broadcast Admin permissions can set "period" via API with scopes study:read, study:write, web:mod

example-period.jsh

String lichessApi = "http://localhost:8080";

if (! Files.exists(Path.of("chariot.jar"))) {
    Files.write(Path.of("chariot.jar"), URI.create(
        "https://repo1.maven.org/maven2/io/github/tors42/chariot/0.1.1/chariot-0.1.1.jar"
        ).toURL().openStream().readAllBytes());
}
/env --class-path chariot.jar

import chariot.*;
import chariot.Client.*;
import chariot.model.*;


void runWithClient(ClientAuth client) throws Exception {

    String name  = "Test Broadcast";
    String descr = "Testing Period";

    String roundName = "Test Round";
    String syncUrl = "http://127.0.1.1/games.pgn";
    int period = 42;

    int updatePeriod = 20;

    if (client.broadcasts().create(b -> b.name(name).shortDescription(descr))
        instanceof Entry(Broadcast broadcast)
        && client.broadcasts().createRound(broadcast.id(), r -> r.name(roundName).syncUrl(syncUrl).period(period))
        instanceof Entry(MyRound round)) {

        System.out.println("Visit " + lichessApi + "/broadcast/round/" + round.id() + "/edit to see value of period.");

        Thread.sleep(5000);

        if (client.broadcasts().updateRound(round.id(), r -> r.name(roundName).syncUrl(syncUrl).period(updatePeriod))
            instanceof Entry(Broadcast.Round updated)) {
            System.out.println("Updated period");
        } else {
            System.out.println("Failed to update round");
        }

    } else {
        System.out.println("Failed to create broadcast and round");
    }
}

switch (Client.auth(
            conf -> conf.api(lichessApi),
            url -> System.out.println("Visit the following URL to grant permission:\n\n" + url),
            pkce -> pkce.scope(Scope.study_read, Scope.study_write, Scope.web_mod))) {
    case AuthOk(var client) -> runWithClient(client);
    case AuthFail(var fail) -> System.out.println("Authorization failed: " + fail);
}

/exit

$ jshell --version
21.0.3

$ jshell example-period.jsh
...

update-period.webm