feat(charting): unify configurable time windows

backend/src/media_library_viewer_api/integrations/qbittorrent.py

@@ -9,7 +9,7 @@ from __future__ import annotations
 
 from typing import TYPE_CHECKING, Any, Literal
 
-from pydantic import Field
+from pydantic import Field, field_validator
 
 from media_library_viewer_api.clients.qbittorrent import QbittorrentClient
 from media_library_viewer_api.integrations.base import (
@@ -83,7 +83,7 @@ class QbittorrentWidgetConfig(WidgetConfigBase):
 class QbittorrentSpeedWidgetConfig(WidgetConfigBase):
     """Speed chart config. The source returns raw bytes/sec; the frontend scales."""
 
-    window_seconds: int = Field(default=1_800, ge=60, le=86_400)
+    window_seconds: int | Literal["all"] = 1_800
     unit: Literal[
         "none",
         "bytes",
@@ -95,6 +95,16 @@ class QbittorrentSpeedWidgetConfig(WidgetConfigBase):
     ] = "bytes_per_sec"
     scale: Literal["auto", "k", "m", "g", "t"] = "auto"
 
+    @field_validator("window_seconds")
+    @classmethod
+    def validate_window_seconds(cls, value: int | str) -> int | str:
+        """Allow all retained samples while bounding explicit numeric windows."""
+        if value == "all":
+            return value
+        if not isinstance(value, int) or not 60 <= value <= 86_400:
+            raise ValueError("window_seconds must be between 60 and 86400, or 'all'")
+        return value
+
 
 DEFINITION = ServiceDefinition(
     service_type="qbittorrent",