DiscoBot/DiscoBot/calendar/CalendarContext.cs

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using static DiscoBot.calendar.Calendar;

namespace DiscoBot.calendar
{
    public class CalendarContext : DbContext
    {
        private ulong guildId;
        public DbSet<CalendarItem> CalendarItems { get; set; }

        public CalendarContext(ulong guildId)
        {
            this.guildId = guildId;
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlite("Data Source=" + guildId + "-calendar.db");
        }
    }

    public class CalendarItemAttendance
    {
        [Key]
        public ulong Id { get; set; }
        public ulong Attendee { get; set; }
        public Attendance Attending { get; set; }
    }
    

    public class CalendarItem
    {
        [Key]
        public ulong Id { get; set; }
        public string Name { get; set; }
        public ulong Channel { get; set; }
        public DateTimeOffset Date { get; set; }
        public string Comment { get; set; }
        public List<CalendarItemAttendance> Attendance { get; set; }
    }
}