diff --git a/src/ClaudeDo.Data/ClaudeDoDbContext.cs b/src/ClaudeDo.Data/ClaudeDoDbContext.cs
index a79dda4..bafa60e 100644
--- a/src/ClaudeDo.Data/ClaudeDoDbContext.cs
+++ b/src/ClaudeDo.Data/ClaudeDoDbContext.cs
@@ -3,6 +3,7 @@ using ClaudeDo.Data.Seeding;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Storage;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
 namespace ClaudeDo.Data;
 
@@ -19,9 +20,24 @@ public class ClaudeDoDbContext : DbContext
     public DbSet<AppSettingsEntity> AppSettings => Set<AppSettingsEntity>();
     public DbSet<PrimeScheduleEntity> PrimeSchedules => Set<PrimeScheduleEntity>();
 
+    private static readonly ValueConverter<DateTime, DateTime> UtcConverter =
+        new(v => v, v => DateTime.SpecifyKind(v, DateTimeKind.Utc));
+
+    private static readonly ValueConverter<DateTime?, DateTime?> UtcNullableConverter =
+        new(v => v, v => v.HasValue ? DateTime.SpecifyKind(v.Value, DateTimeKind.Utc) : null);
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         modelBuilder.ApplyConfigurationsFromAssembly(typeof(ClaudeDoDbContext).Assembly);
+
+        foreach (var entityType in modelBuilder.Model.GetEntityTypes())
+        foreach (var property in entityType.GetProperties())
+        {
+            if (property.ClrType == typeof(DateTime) && property.GetValueConverter() == null)
+                property.SetValueConverter(UtcConverter);
+            else if (property.ClrType == typeof(DateTime?) && property.GetValueConverter() == null)
+                property.SetValueConverter(UtcNullableConverter);
+        }
     }
 
     /// <summary>