Remove target segments, use single color strip source per target

Segments are redundant now that the "mapped" CSS type handles spatial
multiplexing internally. Each target now references one color_strip_source_id
instead of an array of segments with start/end/reverse ranges.

Backward compat: existing targets with old segments format are migrated
on load by extracting the first segment's CSS source ID.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/api/routes/picture_targets.py

@@ -32,7 +32,6 @@ from wled_controller.api.schemas.picture_targets import (
     PictureTargetUpdate,
     TargetMetricsResponse,
     TargetProcessingState,
-    TargetSegmentSchema,
 )
 from wled_controller.config import get_config
 from wled_controller.core.capture_engines import EngineRegistry
@@ -94,15 +93,7 @@ def _target_to_response(target) -> PictureTargetResponse:
             name=target.name,
             target_type=target.target_type,
             device_id=target.device_id,
-            segments=[
-                TargetSegmentSchema(
-                    color_strip_source_id=s.color_strip_source_id,
-                    start=s.start,
-                    end=s.end,
-                    reverse=s.reverse,
-                )
-                for s in target.segments
-            ],
+            color_strip_source_id=target.color_strip_source_id,
             fps=target.fps,
             keepalive_interval=target.keepalive_interval,
             state_check_interval=target.state_check_interval,
@@ -157,7 +148,7 @@ async def create_target(
             name=data.name,
             target_type=data.target_type,
             device_id=data.device_id,
-            segments=[s.model_dump() for s in data.segments] if data.segments else None,
+            color_strip_source_id=data.color_strip_source_id,
             fps=data.fps,
             keepalive_interval=data.keepalive_interval,
             state_check_interval=data.state_check_interval,
@@ -267,12 +258,11 @@ async def update_target(
                 kc_settings = _kc_schema_to_settings(data.key_colors_settings)
 
         # Update in store
-        segments_dicts = [s.model_dump() for s in data.segments] if data.segments is not None else None
         target = target_store.update_target(
             target_id=target_id,
             name=data.name,
             device_id=data.device_id,
-            segments=segments_dicts,
+            color_strip_source_id=data.color_strip_source_id,
             fps=data.fps,
             keepalive_interval=data.keepalive_interval,
             state_check_interval=data.state_check_interval,
@@ -288,7 +278,7 @@ async def update_target(
                                   data.keepalive_interval is not None or
                                   data.state_check_interval is not None or
                                   data.key_colors_settings is not None),
-                segments_changed=data.segments is not None,
+                css_changed=data.color_strip_source_id is not None,
                 device_changed=data.device_id is not None,
             )
         except ValueError:
@@ -756,9 +746,8 @@ async def start_target_overlay(
         # can start even when processing is not currently running.
         calibration = None
         display_info = None
-        if isinstance(target, WledPictureTarget) and target.segments:
-            # Use the first segment's CSS for calibration/overlay
-            first_css_id = target.segments[0].color_strip_source_id
+        if isinstance(target, WledPictureTarget) and target.color_strip_source_id:
+            first_css_id = target.color_strip_source_id
             if first_css_id:
                 try:
                     css = color_strip_store.get_source(first_css_id)

server/src/wled_controller/api/schemas/picture_targets.py

@@ -1,7 +1,7 @@
 """Picture target schemas (CRUD, processing state, metrics)."""
 
 from datetime import datetime
-from typing import Dict, List, Optional
+from typing import Dict, Optional, List
 
 from pydantic import BaseModel, Field
 
@@ -45,15 +45,6 @@ class KeyColorsResponse(BaseModel):
     timestamp: Optional[datetime] = Field(None, description="Extraction timestamp")
 
 
-class TargetSegmentSchema(BaseModel):
-    """A segment mapping a color strip source to a pixel range on the device."""
-
-    color_strip_source_id: str = Field(default="", description="Color strip source ID")
-    start: int = Field(default=0, ge=0, description="Start pixel (inclusive)")
-    end: int = Field(default=0, ge=0, description="End pixel (exclusive, 0 = auto-fit)")
-    reverse: bool = Field(default=False, description="Reverse pixel order within segment")
-
-
 class PictureTargetCreate(BaseModel):
     """Request to create a picture target."""
 
@@ -61,7 +52,7 @@ class PictureTargetCreate(BaseModel):
     target_type: str = Field(default="led", description="Target type (led, key_colors)")
     # LED target fields
     device_id: str = Field(default="", description="LED device ID")
-    segments: List[TargetSegmentSchema] = Field(default_factory=list, description="LED segments")
+    color_strip_source_id: str = Field(default="", description="Color strip source ID")
     fps: int = Field(default=30, ge=1, le=90, description="Target send FPS (1-90)")
     keepalive_interval: float = Field(default=1.0, description="Keepalive send interval when screen is static (0.5-5.0s)", ge=0.5, le=5.0)
     state_check_interval: int = Field(default=DEFAULT_STATE_CHECK_INTERVAL, description="Device health check interval (5-600s)", ge=5, le=600)
@@ -77,7 +68,7 @@ class PictureTargetUpdate(BaseModel):
     name: Optional[str] = Field(None, description="Target name", min_length=1, max_length=100)
     # LED target fields
     device_id: Optional[str] = Field(None, description="LED device ID")
-    segments: Optional[List[TargetSegmentSchema]] = Field(None, description="LED segments")
+    color_strip_source_id: Optional[str] = Field(None, description="Color strip source ID")
     fps: Optional[int] = Field(None, ge=1, le=90, description="Target send FPS (1-90)")
     keepalive_interval: Optional[float] = Field(None, description="Keepalive interval (0.5-5.0s)", ge=0.5, le=5.0)
     state_check_interval: Optional[int] = Field(None, description="Health check interval (5-600s)", ge=5, le=600)
@@ -95,7 +86,7 @@ class PictureTargetResponse(BaseModel):
     target_type: str = Field(description="Target type")
     # LED target fields
     device_id: str = Field(default="", description="LED device ID")
-    segments: List[TargetSegmentSchema] = Field(default_factory=list, description="LED segments")
+    color_strip_source_id: str = Field(default="", description="Color strip source ID")
     fps: Optional[int] = Field(None, description="Target send FPS")
     keepalive_interval: float = Field(default=1.0, description="Keepalive interval (s)")
     state_check_interval: int = Field(default=DEFAULT_STATE_CHECK_INTERVAL, description="Health check interval (s)")
@@ -119,7 +110,7 @@ class TargetProcessingState(BaseModel):
 
     target_id: str = Field(description="Target ID")
     device_id: Optional[str] = Field(None, description="Device ID")
-    segments: List[TargetSegmentSchema] = Field(default_factory=list, description="LED segments")
+    color_strip_source_id: str = Field(default="", description="Color strip source ID")
     processing: bool = Field(description="Whether processing is active")
     fps_actual: Optional[float] = Field(None, description="Actual FPS achieved")
     fps_potential: Optional[float] = Field(None, description="Potential FPS (processing speed without throttle)")