Added new db connection and health check endpoint

api/Public/Program.cs

@@ -1,9 +1,31 @@
+using Microsoft.Data.Sqlite;
+
 var builder = WebApplication.CreateBuilder(args);
 
+var configuredConnectionString = builder.Configuration.GetConnectionString("DefaultConnection")
+    ?? throw new InvalidOperationException("Connection string 'DefaultConnection' was not found.");
+
+var sqliteConnectionStringBuilder = new SqliteConnectionStringBuilder(configuredConnectionString);
+var databasePath = Path.GetFullPath(Path.Combine(builder.Environment.ContentRootPath, sqliteConnectionStringBuilder.DataSource));
+var databaseDirectory = Path.GetDirectoryName(databasePath)
+    ?? throw new InvalidOperationException("Could not determine database directory.");
+
+Directory.CreateDirectory(databaseDirectory);
+
+sqliteConnectionStringBuilder.DataSource = databasePath;
+var resolvedConnectionString = sqliteConnectionStringBuilder.ToString();
+
+builder.Services.AddScoped(_ => new SqliteConnection(resolvedConnectionString));
+
 builder.Services.AddOpenApi();
 
 var app = builder.Build();
 
+using (var connection = new SqliteConnection(resolvedConnectionString))
+{
+    connection.Open();
+}
+
 if (app.Environment.IsDevelopment())
 {
     app.MapOpenApi();
@@ -20,4 +42,19 @@ app.MapGet("/", () =>
 })
 .WithName("GetVersion");
 
+app.MapGet("/health/db", async (SqliteConnection connection) =>
+{
+    await connection.OpenAsync();
+    await using var command = connection.CreateCommand();
+    command.CommandText = "SELECT 1";
+    var result = await command.ExecuteScalarAsync();
+
+    return Results.Ok(new
+    {
+        Database = "ok",
+        Result = result
+    });
+})
+.WithName("GetDatabaseHealth");
+
 app.Run();

api/Public/Public.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.0" />
   </ItemGroup>
 
 </Project>

api/Public/appsettings.Development.json

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

api/Public/appsettings.json

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