diff --git a/langfuse/api/blob_storage_integrations/client.py b/langfuse/api/blob_storage_integrations/client.py
index bf7ab406d..9e8051d8c 100644
--- a/langfuse/api/blob_storage_integrations/client.py
+++ b/langfuse/api/blob_storage_integrations/client.py
@@ -144,7 +144,7 @@ def upsert_blob_storage_integration(
             Path prefix for exported files (must end with forward slash if provided)
 
         export_start_date : typing.Optional[dt.datetime]
-            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE)
+            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE). Must not be in the future (27 h tolerance for timezone differences).
 
         compressed : typing.Optional[bool]
             Enable gzip compression for exported files (.csv.gz, .json.gz, .jsonl.gz). Defaults to true.
@@ -421,7 +421,7 @@ async def upsert_blob_storage_integration(
             Path prefix for exported files (must end with forward slash if provided)
 
         export_start_date : typing.Optional[dt.datetime]
-            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE)
+            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE). Must not be in the future (27 h tolerance for timezone differences).
 
         compressed : typing.Optional[bool]
             Enable gzip compression for exported files (.csv.gz, .json.gz, .jsonl.gz). Defaults to true.
diff --git a/langfuse/api/blob_storage_integrations/raw_client.py b/langfuse/api/blob_storage_integrations/raw_client.py
index 2899c8b7c..9eeb8c2f1 100644
--- a/langfuse/api/blob_storage_integrations/raw_client.py
+++ b/langfuse/api/blob_storage_integrations/raw_client.py
@@ -201,7 +201,7 @@ def upsert_blob_storage_integration(
             Path prefix for exported files (must end with forward slash if provided)
 
         export_start_date : typing.Optional[dt.datetime]
-            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE)
+            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE). Must not be in the future (27 h tolerance for timezone differences).
 
         compressed : typing.Optional[bool]
             Enable gzip compression for exported files (.csv.gz, .json.gz, .jsonl.gz). Defaults to true.
@@ -696,7 +696,7 @@ async def upsert_blob_storage_integration(
             Path prefix for exported files (must end with forward slash if provided)
 
         export_start_date : typing.Optional[dt.datetime]
-            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE)
+            Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE). Must not be in the future (27 h tolerance for timezone differences).
 
         compressed : typing.Optional[bool]
             Enable gzip compression for exported files (.csv.gz, .json.gz, .jsonl.gz). Defaults to true.
diff --git a/langfuse/api/blob_storage_integrations/types/blob_storage_sync_status.py b/langfuse/api/blob_storage_integrations/types/blob_storage_sync_status.py
index 559e41450..b0fc97524 100644
--- a/langfuse/api/blob_storage_integrations/types/blob_storage_sync_status.py
+++ b/langfuse/api/blob_storage_integrations/types/blob_storage_sync_status.py
@@ -12,8 +12,9 @@ class BlobStorageSyncStatus(enum.StrEnum):
     Sync status of the blob storage integration:
     - `disabled` — integration is not enabled
     - `error` — last export failed (see `lastError` for details)
-    - `idle` — enabled but has never exported yet
+    - `running` — an export job is currently being processed
     - `queued` — next export is overdue (`nextSyncAt` is in the past) and waiting to be picked up by the worker
+    - `idle` — enabled but has never exported yet and no export is queued
     - `up_to_date` — all available data has been exported; next export is scheduled for the future
 
     **ETL usage**: poll this endpoint and check for `up_to_date` status. Compare `lastSyncAt` against your
@@ -22,6 +23,7 @@ class BlobStorageSyncStatus(enum.StrEnum):
     """
 
     IDLE = "idle"
+    RUNNING = "running"
     QUEUED = "queued"
     UP_TO_DATE = "up_to_date"
     DISABLED = "disabled"
@@ -30,6 +32,7 @@ class BlobStorageSyncStatus(enum.StrEnum):
     def visit(
         self,
         idle: typing.Callable[[], T_Result],
+        running: typing.Callable[[], T_Result],
         queued: typing.Callable[[], T_Result],
         up_to_date: typing.Callable[[], T_Result],
         disabled: typing.Callable[[], T_Result],
@@ -37,6 +40,8 @@ def visit(
     ) -> T_Result:
         if self is BlobStorageSyncStatus.IDLE:
             return idle()
+        if self is BlobStorageSyncStatus.RUNNING:
+            return running()
         if self is BlobStorageSyncStatus.QUEUED:
             return queued()
         if self is BlobStorageSyncStatus.UP_TO_DATE:
diff --git a/langfuse/api/blob_storage_integrations/types/create_blob_storage_integration_request.py b/langfuse/api/blob_storage_integrations/types/create_blob_storage_integration_request.py
index bba3205f8..44d2d2dda 100644
--- a/langfuse/api/blob_storage_integrations/types/create_blob_storage_integration_request.py
+++ b/langfuse/api/blob_storage_integrations/types/create_blob_storage_integration_request.py
@@ -85,7 +85,7 @@ class CreateBlobStorageIntegrationRequest(UniversalBaseModel):
         typing.Optional[dt.datetime], FieldMetadata(alias="exportStartDate")
     ] = pydantic.Field(default=None)
     """
-    Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE)
+    Custom start date for exports (required when exportMode is FROM_CUSTOM_DATE). Must not be in the future (27 h tolerance for timezone differences).
     """
 
     compressed: typing.Optional[bool] = pydantic.Field(default=None)