diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index e44c43e..713172f 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -19,8 +19,6 @@ services:
       MANAGED_PORTAL_REGISTRY_PATH: "/app/managed_services.yaml"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
-    ports:
-      - "31000-31255:31000-31255"
     networks:
       - managed-portal
 
@@ -39,6 +37,8 @@ services:
       API_HOST: 0.0.0.0
       API_PORT: 18081
       CONFIG_PATH: /app/config/local.yaml
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     volumes:
       - ${MANAGED_STORE_DWELL_CONFIG_DIR:-../managed/store_dwell_alert/config}:/app/config
       - ${MANAGED_STORE_DWELL_DATA_DIR:-../managed/store_dwell_alert/data}:/app/data
@@ -61,6 +61,8 @@ services:
       OUTPUT_DIR: /opt/people-flow/outputs
       API_HOST: 0.0.0.0
       API_PORT: 18082
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     volumes:
       - ${MANAGED_PEOPLE_FLOW_CONFIG_DIR:-../managed/people_flow_project/config}:/opt/people-flow/config
       - ${MANAGED_PEOPLE_FLOW_OUTPUT_DIR:-../managed/people_flow_project/outputs}:/opt/people-flow/outputs
diff --git a/managed/people_flow_project/src/people_flow/counting.py b/managed/people_flow_project/src/people_flow/counting.py
index 7261253..51dcc6c 100644
--- a/managed/people_flow_project/src/people_flow/counting.py
+++ b/managed/people_flow_project/src/people_flow/counting.py
@@ -12,31 +12,55 @@ def _line_side(
 
 
 class LineCrossCounter:
-    def __init__(self, line: tuple[float, float, float, float], config: CountingConfig) -> None:
+    def __init__(
+        self, line: tuple[float, float, float, float], config: CountingConfig
+    ) -> None:
         self.line = line
         self.config = config
         self.previous_side: dict[int, float] = {}
         self.counted_ids: set[int] = set()
+        self.counted_person_keys: set[str] = set()
+        self.crossed_track_ids: set[int] = set()
         self.crossings: list[CrossingEvent] = []
 
-    def update(self, observations: list[TrackObservation]) -> list[CrossingEvent]:
+    def update(
+        self,
+        observations: list[TrackObservation],
+        person_keys: dict[int, str] | None = None,
+    ) -> list[CrossingEvent]:
         events: list[CrossingEvent] = []
         for observation in observations:
             side = _line_side(observation.center, self.line)
             previous = self.previous_side.get(observation.track_id)
             self.previous_side[observation.track_id] = side
 
-            if observation.track_id in self.counted_ids:
+            if observation.track_id in self.crossed_track_ids:
                 continue
             if previous is None:
                 continue
-            if abs(previous) <= self.config.crossing_tolerance or abs(side) <= self.config.crossing_tolerance:
+            if (
+                abs(previous) <= self.config.crossing_tolerance
+                or abs(side) <= self.config.crossing_tolerance
+            ):
                 continue
             if previous * side >= 0:
                 continue
 
-            direction = "negative_to_positive" if previous < 0 < side else "positive_to_negative"
+            direction = (
+                "negative_to_positive"
+                if previous < 0 < side
+                else "positive_to_negative"
+            )
+            person_key = (
+                person_keys.get(observation.track_id, f"track:{observation.track_id}")
+                if person_keys is not None
+                else f"track:{observation.track_id}"
+            )
+            self.crossed_track_ids.add(observation.track_id)
+            if person_key in self.counted_person_keys:
+                continue
             event = CrossingEvent(track_id=observation.track_id, direction=direction)
+            self.counted_person_keys.add(person_key)
             self.counted_ids.add(observation.track_id)
             self.crossings.append(event)
             events.append(event)
@@ -45,8 +69,10 @@ class LineCrossCounter:
     def reset(self) -> None:
         self.previous_side.clear()
         self.counted_ids.clear()
+        self.counted_person_keys.clear()
+        self.crossed_track_ids.clear()
         self.crossings.clear()
 
     @property
     def total_people(self) -> int:
-        return len(self.counted_ids)
+        return len(self.counted_person_keys)
diff --git a/managed/people_flow_project/src/people_flow/pipeline.py b/managed/people_flow_project/src/people_flow/pipeline.py
index aacea72..8dd40de 100644
--- a/managed/people_flow_project/src/people_flow/pipeline.py
+++ b/managed/people_flow_project/src/people_flow/pipeline.py
@@ -22,6 +22,7 @@ from .io_utils import (
 from .models import AppConfig
 from .queue_analytics import QueueWindowTracker
 from .tracking import extract_person_tracks
+from .window_identity import WindowIdentityResolver
 from .webhook import dispatch_json_event
 
 SUPPORTED_EXTENSIONS = {".mp4", ".mov", ".mkv", ".avi"}
@@ -176,6 +177,7 @@ class PeopleFlowPipeline:
         pixel_line = None
         counter = None
         queue_tracker = None
+        identity_resolver = WindowIdentityResolver()
         attributes = AttributeAggregator(self.config.attributes)
         project_root = (
             self.config.config_path.parent.parent
@@ -222,6 +224,7 @@ class PeopleFlowPipeline:
                         counter.reset()
                     if queue_tracker is not None:
                         queue_tracker.reset()
+                    identity_resolver.reset()
                     attributes.reset()
                     now = datetime.now().astimezone()
 
@@ -257,12 +260,13 @@ class PeopleFlowPipeline:
 
                 last_processed_at = current_time
                 observations = self._track_frame(frame)
+                person_keys = identity_resolver.resolve(frame, observations)
                 for observation in observations:
                     attributes.maybe_collect(
                         frame=frame, frame_index=frame_index, track=observation
                     )
                 if counter is not None:
-                    counter.update(observations)
+                    counter.update(observations, person_keys=person_keys)
                 if queue_tracker is not None and self.config.queue.enabled:
                     queue_tracker.observe(observations, now)
                     if current_time >= next_heartbeat_at:
diff --git a/managed/people_flow_project/src/people_flow/window_identity.py b/managed/people_flow_project/src/people_flow/window_identity.py
new file mode 100644
index 0000000..01e4f70
--- /dev/null
+++ b/managed/people_flow_project/src/people_flow/window_identity.py
@@ -0,0 +1,118 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+import numpy as np
+
+from .models import TrackObservation
+
+
+def build_color_signature(crop: np.ndarray) -> list[float]:
+    if crop.size == 0:
+        return [0.0] * 9
+    bands = np.array_split(crop[:, :, :3], 3, axis=0)
+    signature: list[float] = []
+    for band in bands:
+        if band.size == 0:
+            signature.extend([0.0, 0.0, 0.0])
+            continue
+        mean_bgr = band.reshape(-1, 3).mean(axis=0) / 255.0
+        signature.extend(round(float(value), 4) for value in mean_bgr)
+    return signature
+
+
+def signature_similarity(left: list[float], right: list[float]) -> float:
+    if not left or not right:
+        return 0.0
+    size = min(len(left), len(right))
+    if size == 0:
+        return 0.0
+    distance = sum((left[index] - right[index]) ** 2 for index in range(size)) ** 0.5
+    return max(0.0, 1.0 - distance / (size**0.5))
+
+
+@dataclass(slots=True)
+class ActiveWindowPerson:
+    person_key: str
+    signature: list[float]
+
+
+@dataclass(slots=True)
+class PausedWindowPerson:
+    person_key: str
+    signature: list[float]
+
+
+class WindowIdentityResolver:
+    def __init__(self, similarity_threshold: float = 0.97) -> None:
+        self.similarity_threshold = similarity_threshold
+        self.active_by_track: dict[int, ActiveWindowPerson] = {}
+        self.paused_by_person: dict[str, PausedWindowPerson] = {}
+        self.person_counter = 0
+
+    def reset(self) -> None:
+        self.active_by_track.clear()
+        self.paused_by_person.clear()
+        self.person_counter = 0
+
+    def resolve(
+        self, frame: np.ndarray, observations: list[TrackObservation]
+    ) -> dict[int, str]:
+        current_track_ids = {observation.track_id for observation in observations}
+        disappeared_track_ids = [
+            track_id
+            for track_id in self.active_by_track
+            if track_id not in current_track_ids
+        ]
+        for track_id in disappeared_track_ids:
+            active = self.active_by_track.pop(track_id)
+            self.paused_by_person[active.person_key] = PausedWindowPerson(
+                person_key=active.person_key,
+                signature=active.signature,
+            )
+
+        person_keys: dict[int, str] = {}
+        for observation in observations:
+            signature = build_color_signature(self._crop(frame, observation.bbox))
+            active = self.active_by_track.get(observation.track_id)
+            if active is None:
+                person_key = self._match_paused(signature)
+                if person_key is None:
+                    person_key = self._next_person_key()
+                active = ActiveWindowPerson(person_key=person_key, signature=signature)
+                self.active_by_track[observation.track_id] = active
+            else:
+                active.signature = signature
+
+            person_keys[observation.track_id] = active.person_key
+        return person_keys
+
+    def _next_person_key(self) -> str:
+        self.person_counter += 1
+        return f"person:{self.person_counter:05d}"
+
+    def _match_paused(self, signature: list[float]) -> str | None:
+        if max(signature, default=0.0) <= 0.0:
+            return None
+        best_person_key = None
+        best_similarity = 0.0
+        for person_key, paused in self.paused_by_person.items():
+            similarity = signature_similarity(signature, paused.signature)
+            if similarity < self.similarity_threshold:
+                continue
+            if similarity > best_similarity:
+                best_person_key = person_key
+                best_similarity = similarity
+        if best_person_key is not None:
+            del self.paused_by_person[best_person_key]
+        return best_person_key
+
+    @staticmethod
+    def _crop(frame: np.ndarray, bbox: tuple[int, int, int, int]) -> np.ndarray:
+        x1, y1, x2, y2 = bbox
+        height, width = frame.shape[:2]
+        left = max(0, min(x1, width))
+        top = max(0, min(y1, height))
+        right = max(left, min(x2, width))
+        bottom = max(top, min(y2, height))
+        return frame[top:bottom, left:right]
diff --git a/managed/people_flow_project/tests/test_counting.py b/managed/people_flow_project/tests/test_counting.py
new file mode 100644
index 0000000..b5c38ca
--- /dev/null
+++ b/managed/people_flow_project/tests/test_counting.py
@@ -0,0 +1,43 @@
+import numpy as np
+
+from src.people_flow.counting import LineCrossCounter
+from src.people_flow.models import CountingConfig, TrackObservation
+from src.people_flow.window_identity import WindowIdentityResolver
+
+
+def _observation(track_id: int, center_y: float) -> TrackObservation:
+    return TrackObservation(
+        track_id=track_id,
+        bbox=(0, 0, 10, 10),
+        confidence=0.9,
+        center=(5.0, center_y),
+    )
+
+
+def test_line_cross_counter_dedupes_reentry_with_same_person_key():
+    counter = LineCrossCounter(
+        (0.0, 5.0, 10.0, 5.0), CountingConfig(crossing_tolerance=0.0)
+    )
+
+    counter.update([_observation(1, 2.0)], person_keys={1: "person:1"})
+    first_events = counter.update([_observation(1, 8.0)], person_keys={1: "person:1"})
+    counter.update([_observation(2, 2.0)], person_keys={2: "person:1"})
+    second_events = counter.update([_observation(2, 8.0)], person_keys={2: "person:1"})
+
+    assert len(first_events) == 1
+    assert second_events == []
+    assert counter.total_people == 1
+    assert len(counter.crossings) == 1
+    assert counter.crossings[0].track_id == 1
+
+
+def test_window_identity_resolver_matches_reentry_after_track_switch():
+    resolver = WindowIdentityResolver(similarity_threshold=0.97)
+    frame = np.zeros((16, 16, 3), dtype=np.uint8)
+    frame[:, :] = (30, 60, 180)
+
+    first_keys = resolver.resolve(frame, [_observation(1, 2.0)])
+    resolver.resolve(frame, [])
+    second_keys = resolver.resolve(frame, [_observation(2, 8.0)])
+
+    assert first_keys[1] == second_keys[2]
diff --git a/tasks/todo.md b/tasks/todo.md
index 8d73c18..4dd7fcc 100644
--- a/tasks/todo.md
+++ b/tasks/todo.md
@@ -2,24 +2,30 @@
 
 ## Checklist
 
-- [x] Clarify scope, repository boundaries, and validation requirements for a repository-level AGENTS.md.
-- [x] Verify that the plan covers the user-specified workflow rules, project structure, and risk points.
-- [x] Create a complete AGENTS.md that embeds the requested workflow orchestration rules and repo-specific guardrails.
-- [x] Verify the generated AGENTS.md against the current repository structure and required workflow sections.
-- [x] Update the Review section with the final result and verification evidence.
+- [x] Confirm the current `store_dwell_alert` half-hour report path and identify the runtime control point.
+- [x] Verify the plan covers behavior change, focused tests, deployment scope, and post-deploy validation.
+- [ ] Update focused tests so `half_hour_report` is expected on rolling 1800-second windows from startup time.
+- [ ] Implement the rolling window behavior in `store_dwell_alert` runtime code.
+- [ ] Run focused `store_dwell_alert` tests for the changed slice.
+- [ ] Deploy the updated `store_dwell_alert` code to `xiaozheng@10.8.0.11` and restart only the affected service(s).
+- [ ] Validate the remote deployment and update the Review section with evidence.
 
 ## Scope And Risks
 
-- Scope: add a repository-root AGENTS.md that governs future modifications across the Go backend, Vue frontend, deployment assets, and embedded Python managed services.
-- Risk: omit a repository area or validation command and leave future work under-constrained.
-- Risk: copy the requested workflow rules without adapting them to this repo's actual layout and toolchain.
-- Risk: finish without writing persistent task evidence for plan, review, and lessons.
+- Scope: change `managed/store_dwell_alert` so `half_hour_report` uses rolling 1800-second windows from service startup instead of natural `:00` / `:30` boundaries, then deploy the change to `10.8.0.11`.
+- Expected touch points: `managed/store_dwell_alert/app/modules/dwell_engine.py`, `managed/store_dwell_alert/app/modules/reporter.py`, and focused tests under `managed/store_dwell_alert/tests/`.
+- Risk: changing the window model can alter `window_start` and `window_end` values consumed by downstream webhook receivers and manage APIs.
+- Risk: a delayed observation call may span more than one 30-minute window; the implementation should behave predictably and avoid duplicate emissions for the same window.
+- Risk: deployment should be limited to `store-dwell-alert` unless code or config diffs prove broader scope is required.
+
+## Validation Intent
+
+- First pin the new expected behavior with focused tests.
+- After the code change, run the narrowest `store_dwell_alert` tests that cover report timing and report payloads.
+- After deployment, verify the remote service is healthy and that the deployed code matches local content.
 
 ## Review
 
-- Status: completed.
-- Result: added a repository-root `AGENTS.md` plus `tasks/todo.md` and `tasks/lessons.md` to enforce the requested workflow for future non-trivial tasks.
-- Verification:
-  - confirmed `AGENTS.md` exists at the repository root;
-  - read back `AGENTS.md` and verified it covers workflow orchestration, task management, repo structure, validation matrix, and definition of done;
-  - matched required repository-specific references including `internal/webdevice/`, `managed/people_flow_project/`, `managed/store_dwell_alert/`, `tasks/todo.md`, and `tasks/lessons.md`.
+- Status: in progress.
+- Result: pending.
+- Verification: pending.