@Entity(tableName = "repeats" ,
        foreignKeys = @ForeignKey(entity = ListOfTodo.class,
        parentColumns = "uniqueTodoId",
        childColumns = "uniqueRepeatId",
        onDelete = ForeignKey.CASCADE),
        indices = @Index(value = "uniqueRepeatId" ,unique = true))
public class Repeat {

    @NotNull
    @PrimaryKey
    public String uniqueRepeatId;

    @Embedded
    public RepeatType repeatType;
...

public enum RepeatType {

    ONE_TIME(0), DAILY(1), WEEKLY(2), MONTHLY(3), YEARLY(4);

    private int value;

    @TypeConverter
    public static RepeatType fromLevel(Integer level) {
        for (RepeatType p : values()) {
            if (p.value==level) {
                return(p);
            }
        }

        return(null);
...

public class RepeatTime {

    public RepeatTime(int hourReminderTime, int minuteReminderTime) {
        this.hourReminderTime = hourReminderTime;
        this.minuteReminderTime = minuteReminderTime;
    }

    public int hourReminderTime;
    public int minuteReminderTime;
}

public class WeeklyRepeat {

    @TypeConverters({Converters.class})
    public ArrayList<Integer> daysInTheWeek;
    public int weeklyRepeatType;

    public WeeklyRepeat(ArrayList<Integer> daysInTheWeek, int weeklyRepeatType) {
        this.daysInTheWeek = daysInTheWeek;
        this.weeklyRepeatType = weeklyRepeatType;
    }
}

public class MonthlyRepeat{

    public int monthlyRepeatType;
    public int monthlyIntervalRepeatType;

    @TypeConverters({Converters.class})
    public ArrayList<Integer> months;

    @TypeConverters({Converters.class})
    public ArrayList<Integer> days;

    public MonthlyRepeat(int monthlyRepeatType, int monthlyIntervalRepeatType, ArrayList<Integer> months, ArrayList<Integer> days) {
        this.monthlyRepeatType = monthlyRepeatType;
        this.monthlyIntervalRepeatType = monthlyIntervalRepeatType;
        this.months = months;
...

I have a couple problems with my day and night colors.xml files.

https://github.com/ajh3/NoSurfForReddit/blob/master/app/src/main/res/values/colors.xml
https://github.com/ajh3/NoSurfForReddit/blob/master/app/src/main/res/values-night/colors.xml

a) I am hardcoding colorRecyclerViewText and colorRecyclerViewTextClicked, to tweak some colors in my RecyclerView in Day vs. Night mode. I picked these colors by logging them myself from existing colors on widgets in the DayNight theme that looked like nice colors to use. I had to do this because there is no DOM-inspector equivalent in the Layout Inspector, and therefore I have no idea what are the correct style names to reference with ?android:attr/ to avoid hardcoding the values like this. Is there any way to find the style names esides trial and error? I feel like I asked a similar question a few months back and there was no trick to help, but just in case...

@Entity(tableName = "repeats" ,
        foreignKeys = @ForeignKey(entity = Repeat.class,
                parentColumns = "uniqueRepeatId",
                childColumns = "uniqueWeeklyRepeatId",
                onDelete = ForeignKey.CASCADE),
        indices = @Index(value = "uniqueWeeklyRepeatId" ,unique = true))
public class WeeklyRepeat extends RepeatBase{

    public String uniqueWeeklyRepeatId;

    @TypeConverters({Converters.class})
    public ArrayList<Integer> daysInTheWeek;
    public int weeklyRepeatType;

...

public class RepeatBase  {

    // this is enum
    public RepeatType repeatType;

    @Embedded
    public RepeatUntil repeatUntil;

}

so your Dao will have some method like:

@Query("SELECT * FROM ToDo WHERE ...")
List<ToDo> loadToDos()