diff --git a/src/ClaudeDo.Data/Repositories/ListRepository.cs b/src/ClaudeDo.Data/Repositories/ListRepository.cs
index 47a020a..d595f44 100644
--- a/src/ClaudeDo.Data/Repositories/ListRepository.cs
+++ b/src/ClaudeDo.Data/Repositories/ListRepository.cs
@@ -88,4 +88,12 @@ public sealed class ListRepository
         }
         await _context.SaveChangesAsync(ct);
     }
+
+    public async Task<bool> DeleteConfigAsync(string listId, CancellationToken ct = default)
+    {
+        var affected = await _context.ListConfigs
+            .Where(c => c.ListId == listId)
+            .ExecuteDeleteAsync(ct);
+        return affected > 0;
+    }
 }
diff --git a/tests/ClaudeDo.Worker.Tests/Repositories/ListRepositoryDeleteConfigTests.cs b/tests/ClaudeDo.Worker.Tests/Repositories/ListRepositoryDeleteConfigTests.cs
new file mode 100644
index 0000000..5e4bd28
--- /dev/null
+++ b/tests/ClaudeDo.Worker.Tests/Repositories/ListRepositoryDeleteConfigTests.cs
@@ -0,0 +1,56 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Tests.Infrastructure;
+using Xunit;
+
+namespace ClaudeDo.Worker.Tests.Repositories;
+
+public sealed class ListRepositoryDeleteConfigTests : IDisposable
+{
+    private readonly DbFixture _db = new();
+    private readonly ClaudeDoDbContext _ctx;
+    private readonly ListRepository _repo;
+
+    public ListRepositoryDeleteConfigTests()
+    {
+        _ctx = _db.CreateContext();
+        _repo = new ListRepository(_ctx);
+    }
+
+    public void Dispose()
+    {
+        _ctx.Dispose();
+        _db.Dispose();
+    }
+
+    [Fact]
+    public async Task DeleteConfigAsync_RemovesExistingRow()
+    {
+        var listId = Guid.NewGuid().ToString();
+        await _repo.AddAsync(new ListEntity
+        {
+            Id = listId, Name = "L", CreatedAt = DateTime.UtcNow,
+        });
+        await _repo.SetConfigAsync(new ListConfigEntity
+        {
+            ListId = listId,
+            Model = "opus",
+            SystemPrompt = "hello",
+            AgentPath = "/tmp/a.md",
+        });
+
+        var removed = await _repo.DeleteConfigAsync(listId);
+
+        Assert.True(removed);
+        Assert.Null(await _repo.GetConfigAsync(listId));
+    }
+
+    [Fact]
+    public async Task DeleteConfigAsync_ReturnsFalseWhenAbsent()
+    {
+        var removed = await _repo.DeleteConfigAsync(Guid.NewGuid().ToString());
+
+        Assert.False(removed);
+    }
+}