Fix for DateTimeOffset with SQLite

src/Tgstation.Server.Host/Database/SqliteDatabaseContext.cs

@@ -1,7 +1,9 @@
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using System;
+using System.Linq;
 using Tgstation.Server.Host.Configuration;
 
 namespace Tgstation.Server.Host.Database
@@ -28,6 +30,33 @@ namespace Tgstation.Server.Host.Database
 			options.UseSqlite(DatabaseConfiguration.ConnectionString);
 		}
 
+		/// <inheritdoc />
+		protected override void OnModelCreating(ModelBuilder modelBuilder)
+		{
+			base.OnModelCreating(modelBuilder);
+
+			// Shamelessly stolen from https://blog.dangl.me/archive/handling-datetimeoffset-in-sqlite-with-entity-framework-core/
+
+			// SQLite does not have proper support for DateTimeOffset via Entity Framework Core, see the limitations
+			// here: https://docs.microsoft.com/en-us/ef/core/providers/sqlite/limitations#query-limitations
+			// To work around this, when the Sqlite database provider is used, all model properties of type DateTimeOffset
+			// use the DateTimeOffsetToBinaryConverter
+			// Based on: https://github.com/aspnet/EntityFrameworkCore/issues/10784#issuecomment-415769754
+			// This only supports millisecond precision, but should be sufficient for most use cases.
+			foreach (var entityType in modelBuilder.Model.GetEntityTypes())
+			{
+				var properties = entityType
+					.ClrType
+					.GetProperties()
+					.Where(p => p.PropertyType == typeof(DateTimeOffset) || p.PropertyType == typeof(DateTimeOffset?));
+				foreach (var property in properties)
+					modelBuilder
+						.Entity(entityType.Name)
+						.Property(property.Name)
+						.HasConversion(new DateTimeOffsetToBinaryConverter());
+			}
+		}
+
 		/// <inheritdoc />
 		protected override void ValidateDatabaseType()
 		{