First Commit

Helpers/ADS.Helpers.MultiTenant/Data/IDbConnectionFactory.cs

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+using System.Data;
+
+namespace ADS.Helpers.MultiTenant.Data;
+
+public interface IDbConnectionFactory
+{
+    IDbConnection Create();
+}

Helpers/ADS.Helpers.MultiTenant/Data/TenantDbConnectionFactory.cs

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+using System.Data;
+using ADS.Helpers.MultiTenant.InternalRouting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Data.SqlClient;
+
+namespace ADS.Helpers.MultiTenant.Data;
+
+public sealed class TenantDbConnectionFactory : IDbConnectionFactory
+{
+    private readonly IHttpContextAccessor _http;
+
+    public TenantDbConnectionFactory(IHttpContextAccessor http) => _http = http;
+
+    public IDbConnection Create()
+    {
+        var ctx = _http.HttpContext ?? throw new InvalidOperationException("HTTP_CONTEXT_NOT_AVAILABLE");
+
+        if (!ctx.Items.TryGetValue(InternalTenantDbHeaders.ItemConn, out var csObj) ||
+            csObj is not string cs ||
+            string.IsNullOrWhiteSpace(cs))
+            throw new InvalidOperationException("INTERNAL_CONN_MISSING");
+
+        return new SqlConnection(cs);
+    }
+}