messengerapi/code/MessengerApi.Db/MessengerDbContext.cs

using MessengerApi.Db.Converters;
using MessengerApi.Db.Entities;
using Microsoft.EntityFrameworkCore;

namespace MessengerApi.Db
{
    public abstract class MessengerDbContext : DbContext
    {
        public DbSet<User> Users { get; set; }

        public DbSet<Message> Messages { get; set; }

        public DbSet<UserRoute> UserRoutes { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<User>().HasKey(e => e.Id);
            modelBuilder.Entity<Message>().HasKey(e => e.Id);
            modelBuilder.Entity<Message>().Property(e => e.CreatedUtc).HasConversion<DateTimeAsUtcValueConverter>();
            modelBuilder.Entity<Message>().Property(e => e.TimeToLiveInSeconds).IsRequired();
            modelBuilder.Entity<UserRoute>().HasKey(e => e.Id);
        }
    }
}