From 6b58dfa4e46552cac27fec0289f95c0951476474 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20=C5=A0vr=C4=8Dina?= <martin.svrcina@memos.cz>
Date: Tue, 17 Mar 2026 00:28:31 +0100
Subject: [PATCH] Add BaseModel and AppDbContext with auto timestamps

- BaseModel in Domain.Common with Id, Created, Updated, Deleted fields
- AppDbContext in Infrastructure.Persistence overrides SaveChanges/Async
  to automatically set Created/Updated via ChangeTracker
- Added EF Core 8 and Pomelo.EntityFrameworkCore.MySql 8 packages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 backend/ClaudeTest.Domain/Common/BaseModel.cs |  9 ++++
 .../ClaudeTest.Infrastructure.csproj          |  5 +++
 .../Persistence/AppDbContext.cs               | 42 +++++++++++++++++++
 3 files changed, 56 insertions(+)
 create mode 100644 backend/ClaudeTest.Domain/Common/BaseModel.cs
 create mode 100644 backend/ClaudeTest.Infrastructure/Persistence/AppDbContext.cs

diff --git a/backend/ClaudeTest.Domain/Common/BaseModel.cs b/backend/ClaudeTest.Domain/Common/BaseModel.cs
new file mode 100644
index 0000000..94ca85b
--- /dev/null
+++ b/backend/ClaudeTest.Domain/Common/BaseModel.cs
@@ -0,0 +1,9 @@
+namespace ClaudeTest.Domain.Common;
+
+public abstract class BaseModel
+{
+    public int Id { get; set; }
+    public DateTime Created { get; set; }
+    public DateTime Updated { get; set; }
+    public DateTime? Deleted { get; set; }
+}
diff --git a/backend/ClaudeTest.Infrastructure/ClaudeTest.Infrastructure.csproj b/backend/ClaudeTest.Infrastructure/ClaudeTest.Infrastructure.csproj
index d5ccce6..073aff5 100644
--- a/backend/ClaudeTest.Infrastructure/ClaudeTest.Infrastructure.csproj
+++ b/backend/ClaudeTest.Infrastructure/ClaudeTest.Infrastructure.csproj
@@ -5,6 +5,11 @@
     <ProjectReference Include="..\ClaudeTest.Domain\ClaudeTest.Domain.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.*" />
+    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="8.*" />
+  </ItemGroup>
+
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
diff --git a/backend/ClaudeTest.Infrastructure/Persistence/AppDbContext.cs b/backend/ClaudeTest.Infrastructure/Persistence/AppDbContext.cs
new file mode 100644
index 0000000..41edd19
--- /dev/null
+++ b/backend/ClaudeTest.Infrastructure/Persistence/AppDbContext.cs
@@ -0,0 +1,42 @@
+using ClaudeTest.Domain.Common;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeTest.Infrastructure.Persistence;
+
+public class AppDbContext : DbContext
+{
+    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
+    {
+    }
+
+    public override int SaveChanges()
+    {
+        SetTimestamps();
+        return base.SaveChanges();
+    }
+
+    public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
+    {
+        SetTimestamps();
+        return base.SaveChangesAsync(cancellationToken);
+    }
+
+    private void SetTimestamps()
+    {
+        var entries = ChangeTracker.Entries<BaseModel>();
+
+        foreach (var entry in entries)
+        {
+            switch (entry.State)
+            {
+                case EntityState.Added:
+                    entry.Entity.Created = DateTime.UtcNow;
+                    entry.Entity.Updated = DateTime.UtcNow;
+                    break;
+                case EntityState.Modified:
+                    entry.Entity.Updated = DateTime.UtcNow;
+                    break;
+            }
+        }
+    }
+}