Add EF Core + SQLite with empty AppDbContext

.gitignore

@@ -9,3 +9,8 @@ backend/bin/
 backend/obj/
 backend.tests/bin/
 backend.tests/obj/
+
+# SQLite dev database (created on first run)
+backend/*.db
+backend/*.db-shm
+backend/*.db-wal

backend/Data/AppDbContext.cs

@@ -0,0 +1,7 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace backend.Data;
+
+public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
+{
+}

backend/Migrations/20260611181007_Initial.Designer.cs

@@ -0,0 +1,24 @@
+// <auto-generated />
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using backend.Data;
+
+#nullable disable
+
+namespace backend.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260611181007_Initial")]
+    partial class Initial
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "9.0.17");
+#pragma warning restore 612, 618
+        }
+    }
+}

backend/Migrations/20260611181007_Initial.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace backend.Migrations
+{
+    /// <inheritdoc />
+    public partial class Initial : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

backend/Migrations/AppDbContextModelSnapshot.cs

@@ -0,0 +1,21 @@
+// <auto-generated />
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using backend.Data;
+
+#nullable disable
+
+namespace backend.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    partial class AppDbContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "9.0.17");
+#pragma warning restore 612, 618
+        }
+    }
+}

backend/Program.cs

@@ -1,7 +1,20 @@
+using backend.Data;
+using Microsoft.EntityFrameworkCore;
+
 var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddDbContext<AppDbContext>(opt =>
+    opt.UseSqlite(builder.Configuration.GetConnectionString("Default")));
+
 var app = builder.Build();
 
-app.MapGet("/", () => "Hello World!");
+using (var scope = app.Services.CreateScope())
+{
+    var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+    db.Database.Migrate();
+}
+
+app.MapGet("/health", () => Results.Ok(new { ok = true }));
 
 app.Run();
 

backend/appsettings.json

@@ -1,4 +1,7 @@
 {
+  "ConnectionStrings": {
+    "Default": "Data Source=./assistant.db"
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Information",

backend/backend.csproj

@@ -6,4 +6,12 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.*">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.*" />
+  </ItemGroup>
+
 </Project>