fix(nodes): locate agents behind a proxy and retry missing countries [CI]

backend/tests/MoShiro.Backend.Tests/ClientAddressTests.cs

@@ -48,4 +48,12 @@ public sealed class ClientAddressTests
     [Fact]
     public void AMalformedTrustedProxyEntry_FailsAtStartup() =>
         Assert.Throws<InvalidOperationException>(() => new ClientAddressResolver(new BackendOptions { TrustedProxies = "banana" }));
+
+    [Fact]
+    public void TheFleetLinkAsksTheSameResolver_SoANodeBehindAProxyKeepsItsRealAddress()
+    {
+        Fleet.Server.IClientAddressSource source = new ClientAddressResolver(new BackendOptions { TrustedProxies = "127.0.0.1" });
+        Assert.Equal("198.51.100.7", source.Resolve(IPAddress.Parse("127.0.0.1"), _ => ["198.51.100.7"]));
+        Assert.Equal("203.0.113.9", source.Resolve(IPAddress.Parse("203.0.113.9"), _ => ["198.51.100.7"]));
+    }
 }

backend/tests/MoShiro.Backend.Tests/NodeInfoTests.cs

@@ -102,6 +102,24 @@ public sealed partial class NodeInfoTests
         Assert.Null(Assert.Single(await service.ListAsync(CancellationToken.None)).Country);
     }
 
+    [Fact]
+    public async Task Service_AnUnlocatedNode_IsRetriedFromTheHeartbeat_UntilItHasACountry()
+    {
+        var time = new FakeTimeProvider(DateTimeOffset.Parse("2026-10-06T00:00:00Z"));
+        var service = new NodeInfoService(new MemoryStore(), new FakeGeo(null), time);
+
+        Assert.True(service.ShouldRetryGeo("agt_1"));
+        await service.ObserveAddressAsync("agt_1", NodeKinds.Agent, "", CancellationToken.None);
+        Assert.False(service.ShouldRetryGeo("agt_1"));
+        time.Advance(TimeSpan.FromMinutes(11));
+        Assert.True(service.ShouldRetryGeo("agt_1"));
+
+        var found = new NodeInfoService(new MemoryStore(), new FakeGeo(new GeoInfo("jp", 1, "Example", false)), time);
+        await found.ObserveAddressAsync("agt_2", NodeKinds.Agent, "8.8.8.8", CancellationToken.None);
+        time.Advance(TimeSpan.FromMinutes(11));
+        Assert.False(found.ShouldRetryGeo("agt_2"));
+    }
+
     [Fact]
     public async Task Service_PlatformIsSavedAndSurvivesARestart()
     {