Merge pull request #7526 from HuntercodeT/fix/passthrough-model-discovery-merge

fix(gateway): let OpenAI passthrough accounts supplement model discovery instead of hiding mapped models

backend/internal/handler/gateway_models_test.go

@@ -287,6 +287,18 @@ func TestGatewayModels_UnmappedOpenAIAccountsSupplementMappedModels(t *testing.T
 			accounts: accounts[1:],
 			want:     []string{sparkModel, alias},
 		},
+		{
+			// A passthrough account with a stale mapping behaves like an unmapped
+			// one: it adds the defaults but never its own mapping keys, and it no
+			// longer hides the aliases declared on ordinary accounts.
+			name: "passthrough account contributes defaults without hiding mapped aliases",
+			accounts: append([]service.Account{{
+				ID: 5, Platform: service.PlatformOpenAI, Type: service.AccountTypeOAuth,
+				Credentials: map[string]any{"model_mapping": map[string]any{"stale-model": "stale-model"}},
+				Extra:       map[string]any{"openai_passthrough": true},
+			}}, accounts[1:]...),
+			want: append(openai.DefaultModelIDs(), alias),
+		},
 		{
 			name:     "unmapped accounts from another platform do not add defaults",
 			accounts: append([]service.Account{{ID: 4, Platform: service.PlatformAnthropic}}, accounts[1:]...),