diff --git a/litellm/integrations/otel/presets/signoz.py b/litellm/integrations/otel/presets/signoz.py
index 7008905481b..a2dcd3eb79e 100644
--- a/litellm/integrations/otel/presets/signoz.py
+++ b/litellm/integrations/otel/presets/signoz.py
@@ -1,5 +1,6 @@
 """SigNoz preset — OTLP/HTTP exporter to SigNoz + GenAI vocabulary."""
 
+from types import MappingProxyType
 from typing import Final
 
 from pydantic import Field
@@ -20,7 +21,7 @@ class _SigNozSettings(BaseSettings):
     model_config = SettingsConfigDict(case_sensitive=False, extra="ignore")
 
     # One endpoint for both SigNoz Cloud and self-hosted, with no default host, so
-    # nothing exports until the operator names a destination.
+    # nothing exports until the operator names a destination
     endpoint: str | None = Field(default=None, validation_alias=SIGNOZ_INGESTION_ENDPOINT_ENV)
     ingestion_key: str | None = Field(default=None, validation_alias="SIGNOZ_INGESTION_KEY")
 
@@ -32,35 +33,36 @@ def signoz_preset(
     settings: Final = _SigNozSettings()
     base: Final = config_overrides or OpenTelemetryV2Config()
     key: Final = settings.ingestion_key
+    spec: Final = ExporterSpec(
+        kind="otlp_http",
+        endpoint=settings.endpoint,
+        headers=(f"signoz-ingestion-key={key}" if key else None),
+        owner=ExporterOwner.SIGNOZ,
+        # Cloud rejects keyless exports; a self-hosted collector accepts them
+        requires_headers=bool(key),
+    )
     return base.model_copy(
-        update={  # mutable-ok: model_copy takes a dict of field updates
-            "exporters": [  # mutable-ok: matches the config's exporters list
-                *base.exporters,
-                ExporterSpec(
-                    kind="otlp_http",
-                    endpoint=settings.endpoint,
-                    headers=(f"signoz-ingestion-key={key}" if key else None),
-                    owner=ExporterOwner.SIGNOZ,
-                    # Cloud rejects keyless exports; a self-hosted collector accepts them.
-                    requires_headers=bool(key),
-                ),
-            ],
-            # SigNoz ingests the OTLP GenAI semantic conventions natively.
-            "mapper_names": ensure_mappers(base.mapper_names, "genai"),
-        }
+        update=MappingProxyType(
+            {
+                "exporters": (*base.exporters, spec),
+                "mapper_names": ensure_mappers(base.mapper_names, "genai"),
+            }
+        )
     )
 
 
 def signoz_dynamic_endpoint(params: StandardCallbackDynamicParams) -> str | None:
     """Per-request SigNoz endpoint from team/key dynamic params.
 
-    ``None`` keeps the operator's endpoint, so a team that saved only a key
-    still exports to the configured destination.
+    ``None`` keeps the operator's endpoint, so a team that saved only a key still
+    exports to the configured destination.
     """
     return params.get("signoz_ingestion_endpoint")
 
 
-def signoz_dynamic_headers(params: StandardCallbackDynamicParams) -> dict[str, str]:  # mutable-ok: registry type
+def signoz_dynamic_headers(
+    params: StandardCallbackDynamicParams,
+) -> dict[str, str]:  # mutable-ok: DYNAMIC_HEADERS_BY_CALLBACK returns a dict
     """Per-request SigNoz OTLP headers from team/key dynamic params."""
     key: Final = params.get("signoz_ingestion_key")
-    return {header: value for header, value in (("signoz-ingestion-key", key),) if value}  # mutable-ok: registry type
+    return {"signoz-ingestion-key": key} if key else {}  # mutable-ok: same registry contract
diff --git a/litellm/proxy/_types.py b/litellm/proxy/_types.py
index c904cdb5ecb..57cef2b1566 100644
--- a/litellm/proxy/_types.py
+++ b/litellm/proxy/_types.py
@@ -3503,10 +3503,7 @@ class AllCallbacks(LiteLLMPydanticObjectBase):
     signoz: CallbackOnUI = CallbackOnUI(
         litellm_callback_name="signoz",
         ui_callback_name="SigNoz",
-        litellm_callback_params=[
-            "SIGNOZ_INGESTION_ENDPOINT",
-            "SIGNOZ_INGESTION_KEY",
-        ],
+        litellm_callback_params=("SIGNOZ_INGESTION_ENDPOINT", "SIGNOZ_INGESTION_KEY"),
     )
 
 
diff --git a/litellm/types/utils.py b/litellm/types/utils.py
index ee5d3e7c241..537da823e94 100644
--- a/litellm/types/utils.py
+++ b/litellm/types/utils.py
@@ -3307,7 +3307,7 @@ class StandardCallbackDynamicParams(TypedDict, total=False):
 
     # SigNoz dynamic params (proxy-stamped team/key callback vars only;
     # request-supplied values are blocked)
-    signoz_ingestion_endpoint: str | None  # writable-ok: initialize_standard_callback_dynamic_params assigns into the dict
+    signoz_ingestion_endpoint: str | None  # writable-ok: assigned by initialize_standard_callback_dynamic_params
     signoz_ingestion_key: str | None  # writable-ok: initialize_standard_callback_dynamic_params assigns into the dict
 
     # Logging settings
diff --git a/ui/litellm-dashboard/src/lib/http/schema.d.ts b/ui/litellm-dashboard/src/lib/http/schema.d.ts
index d311bfa3cbc..7de3800c711 100644
--- a/ui/litellm-dashboard/src/lib/http/schema.d.ts
+++ b/ui/litellm-dashboard/src/lib/http/schema.d.ts
@@ -45388,7 +45388,7 @@ export interface operations {
         parameters: {
             query: {
                 /** @description Specify the service being hit. */
-                service: ("slack_budget_alerts" | "langfuse" | "langfuse_otel" | "slack" | "openmeter" | "webhook" | "email" | "braintrust" | "datadog" | "datadog_llm_observability" | "generic_api" | "arize" | "galileo" | "newrelic" | "sqs") | string;
+                service: ("slack_budget_alerts" | "langfuse" | "langfuse_otel" | "slack" | "openmeter" | "webhook" | "email" | "braintrust" | "datadog" | "datadog_llm_observability" | "generic_api" | "arize" | "galileo" | "newrelic" | "signoz" | "sqs") | string;
             };
             header?: never;
             path?: never;