diff --git a/core/jobs/handlers/detect.py b/core/jobs/handlers/detect.py
new file mode 100644
index 0000000..67ce4e0
--- /dev/null
+++ b/core/jobs/handlers/detect.py
@@ -0,0 +1,130 @@
+"""
+DetectHandler — runs the detection pipeline as a Celery job.
+
+Supports three modes via payload:
+  - Initial run: {"video_path": "...", "profile_name": "..."}
+  - Replay: {"replay_from": "run_ocr", "source_job_id": "...", "config_overrides": {...}}
+  - Retry: {"retry_from": "escalate_vlm", "source_job_id": "...", "config_overrides": {...}}
+"""
+
+import logging
+import os
+import uuid
+from typing import Any, Callable, Dict, Optional
+
+from .base import Handler
+
+logger = logging.getLogger(__name__)
+
+
+class DetectHandler(Handler):
+
+    def process(
+        self,
+        job_id: str,
+        payload: Dict[str, Any],
+        progress_callback: Optional[Callable[[int, Dict[str, Any]], None]] = None,
+    ) -> Dict[str, Any]:
+
+        replay_from = payload.get("replay_from")
+        source_job_id = payload.get("source_job_id")
+
+        if replay_from and source_job_id:
+            return self._run_replay(job_id, source_job_id, replay_from, payload, progress_callback)
+
+        return self._run_initial(job_id, payload, progress_callback)
+
+    def _run_initial(
+        self,
+        job_id: str,
+        payload: Dict[str, Any],
+        progress_callback: Optional[Callable],
+    ) -> Dict[str, Any]:
+        from detect import emit
+        from detect.graph import get_pipeline
+        from detect.state import DetectState
+
+        video_path = payload["video_path"]
+        profile_name = payload.get("profile_name", "soccer_broadcast")
+        source_asset_id = payload.get("source_asset_id", "")
+        checkpoint_enabled = payload.get("checkpoint", os.environ.get("MPR_CHECKPOINT") == "1")
+
+        emit.set_run_context(
+            run_id=job_id,
+            parent_job_id=payload.get("parent_job_id", job_id),
+            run_type="initial",
+        )
+
+        logger.info("DetectHandler: initial run job=%s video=%s profile=%s checkpoint=%s",
+                     job_id, video_path, profile_name, checkpoint_enabled)
+
+        if progress_callback:
+            progress_callback(0, {"stage": "starting"})
+
+        pipeline = get_pipeline(checkpoint=checkpoint_enabled)
+
+        initial_state = DetectState(
+            video_path=video_path,
+            job_id=job_id,
+            profile_name=profile_name,
+            source_asset_id=source_asset_id,
+        )
+
+        try:
+            result = pipeline.invoke(initial_state)
+        finally:
+            emit.clear_run_context()
+
+        detections = result.get("detections", [])
+        report = result.get("report")
+        brands_found = len(report.brands) if report else 0
+
+        if progress_callback:
+            progress_callback(100, {"stage": "completed"})
+
+        return {
+            "status": "completed",
+            "job_id": job_id,
+            "detections": len(detections),
+            "brands_found": brands_found,
+        }
+
+    def _run_replay(
+        self,
+        job_id: str,
+        source_job_id: str,
+        start_stage: str,
+        payload: Dict[str, Any],
+        progress_callback: Optional[Callable],
+    ) -> Dict[str, Any]:
+        from detect.checkpoint import replay_from
+
+        config_overrides = payload.get("config_overrides", {})
+
+        logger.info("DetectHandler: replay job=%s from=%s source=%s overrides=%s",
+                     job_id, start_stage, source_job_id, config_overrides)
+
+        if progress_callback:
+            progress_callback(0, {"stage": f"replaying from {start_stage}"})
+
+        result = replay_from(
+            job_id=source_job_id,
+            start_stage=start_stage,
+            config_overrides=config_overrides,
+        )
+
+        detections = result.get("detections", [])
+        report = result.get("report")
+        brands_found = len(report.brands) if report else 0
+
+        if progress_callback:
+            progress_callback(100, {"stage": "completed"})
+
+        return {
+            "status": "completed",
+            "job_id": job_id,
+            "source_job_id": source_job_id,
+            "replay_from": start_stage,
+            "detections": len(detections),
+            "brands_found": brands_found,
+        }
diff --git a/core/jobs/registry.py b/core/jobs/registry.py
index 6b9b4f7..9956e31 100644
--- a/core/jobs/registry.py
+++ b/core/jobs/registry.py
@@ -25,9 +25,11 @@ def _register_defaults() -> None:
     """Register built-in handlers."""
     from .handlers.chunk import ChunkHandler
     from .handlers.transcode import TranscodeHandler
+    from .handlers.detect import DetectHandler
 
     register_handler("transcode", TranscodeHandler)
     register_handler("chunk", ChunkHandler)
+    register_handler("detect", DetectHandler)
 
 
 _register_defaults()
diff --git a/ctrl/docker-compose.yml b/ctrl/docker-compose.yml
index e3d562f..13402d3 100644
--- a/ctrl/docker-compose.yml
+++ b/ctrl/docker-compose.yml
@@ -150,7 +150,7 @@ services:
     build:
       context: ..
       dockerfile: ctrl/Dockerfile.worker
-    command: celery -A admin.mpr worker -l info -Q celery,transcode -c 2
+    command: celery -A admin.mpr worker -l info -Q celery,transcode,detect,detect_retry -c 2
     environment:
       <<: *common-env
       MPR_EXECUTOR: local
diff --git a/ctrl/nginx.conf b/ctrl/nginx.conf
index 5358c75..db32b21 100644
--- a/ctrl/nginx.conf
+++ b/ctrl/nginx.conf
@@ -98,6 +98,13 @@ http {
             proxy_set_header Host $host;
         }
 
+        # Detection API (replay, retry, checkpoints)
+        location /api/detect/ {
+            proxy_pass http://fastapi/detect/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+        }
+
         # SSE streams — disable buffering for realtime delivery
         location /api/detect/stream/ {
             proxy_pass http://fastapi/detect/stream/;