diff --git a/tests/test_api.py b/tests/test_api.py
index 608f920..74f2fb6 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -1,8 +1,10 @@
+import re
+
 import pytest
 
 from app import db
 from app.api import reset_rate_limiter
-from app.models import TimeSlot, WorkplacePresenceEvent
+from app.models import TimeSlot, WorkEntry, WorkplacePresenceEvent
 
 TOKEN = "test-api-token"
 URL = "/api/v1/workplace-presence"
@@ -39,6 +41,156 @@ def test_arrival_and_departure_create_expected_records(client, app):
         assert db.session.query(TimeSlot).count() == 1
 
 
+def test_arrival_entry_can_be_fully_edited_from_web_form(client, app):
+    arrival = post(
+        client,
+        {
+            "event": "arrival",
+            "occurred_at": "2026-08-13T08:00:00+02:00",
+            "idempotency_key": "web-edit-arrival",
+        },
+    )
+    assert arrival.status_code == 201
+    entry_id = arrival.json["entry_id"]
+
+    form = client.get(f"/entries/{entry_id}/edit")
+    assert form.status_code == 200
+    assert "Véhicule à moteur seul" in form.text
+    assert re.search(
+        r'<option value="moteur_seul".*?data-has-motor="true".*?selected',
+        form.text,
+        re.DOTALL,
+    )
+    assert "Citadine électrique" in form.text
+    assert re.search(r'name="motor_vehicle_id" value="citadine".*?checked', form.text, re.DOTALL)
+    assert 'name="start_time"' in form.text
+    assert 'name="end_time"' in form.text
+
+    formation = client.post(
+        f"/entries/{entry_id}/edit",
+        data={
+            "date": "2026-08-13",
+            "day_type": "FORMATION",
+            "journey_profile_id": "moteur_velo",
+            "motor_vehicle_id": "familiale",
+            "start_time": ["08:00"],
+            "end_time": ["12:00"],
+            "comment": "Formation",
+        },
+    )
+    assert formation.status_code == 302
+
+    with app.app_context():
+        entry = db.session.get(WorkEntry, entry_id)
+        assert entry.day_type == "FORMATION"
+        assert entry.journey_profile_id == "moteur_velo"
+        assert entry.motor_vehicle_id == "familiale"
+        assert [(slot.start_time.hour, slot.end_time.hour) for slot in entry.time_slots] == [
+            (8, 12)
+        ]
+
+    garde = client.post(
+        f"/entries/{entry_id}/edit",
+        data={
+            "date": "2026-08-13",
+            "day_type": "GARDE",
+            "journey_profile_id": "moteur_seul",
+            "motor_vehicle_id": "moto",
+            "start_time": ["08:00", "13:00", ""],
+            "end_time": ["12:00", "17:00", ""],
+            "comment": "Garde",
+        },
+    )
+    assert garde.status_code == 302
+
+    with app.app_context():
+        entry = db.session.get(WorkEntry, entry_id)
+        assert entry.day_type == "GARDE"
+        assert entry.journey_profile_id == "moteur_seul"
+        assert entry.motor_vehicle_id == "moto"
+        assert [(slot.start_time.hour, slot.end_time.hour) for slot in entry.time_slots] == [
+            (8, 12),
+            (13, 17),
+        ]
+        event = db.session.scalar(
+            db.select(WorkplacePresenceEvent).where(
+                WorkplacePresenceEvent.idempotency_key == "web-edit-arrival"
+            )
+        )
+        assert event.entry_id == entry_id
+        assert event.time_slot_id is None
+
+    empty_slots = client.post(
+        f"/entries/{entry_id}/edit",
+        data={
+            "date": "2026-08-13",
+            "day_type": "GARDE",
+            "journey_profile_id": "moteur_seul",
+            "motor_vehicle_id": "moto",
+            "start_time": [""],
+            "end_time": [""],
+            "comment": "Garde sans plage",
+        },
+    )
+    assert empty_slots.status_code == 302
+
+    with app.app_context():
+        entry = db.session.get(WorkEntry, entry_id)
+        assert entry.time_slots == []
+        assert entry.day_type == "GARDE"
+        assert db.session.query(WorkplacePresenceEvent).count() == 1
+
+
+def test_web_edit_recreates_slots_without_losing_arrival_departure_events(client, app):
+    arrival = post(
+        client,
+        {
+            "event": "arrival",
+            "occurred_at": "2026-08-14T08:00:00+02:00",
+            "idempotency_key": "recreate-arrival",
+        },
+    )
+    departure = post(
+        client,
+        {
+            "event": "departure",
+            "occurred_at": "2026-08-14T17:00:00+02:00",
+            "idempotency_key": "recreate-departure",
+        },
+    )
+    assert arrival.status_code == 201
+    assert departure.status_code == 200
+    entry_id = arrival.json["entry_id"]
+
+    response = client.post(
+        f"/entries/{entry_id}/edit",
+        data={
+            "date": "2026-08-14",
+            "day_type": "FORMATION",
+            "journey_profile_id": "moteur_velo",
+            "motor_vehicle_id": "familiale",
+            "start_time": ["09:00", "13:00", ""],
+            "end_time": ["12:00", "17:00", ""],
+            "comment": "Plages recréées",
+        },
+    )
+    assert response.status_code == 302
+
+    with app.app_context():
+        entry = db.session.get(WorkEntry, entry_id)
+        assert len(entry.time_slots) == 2
+        events = db.session.scalars(
+            db.select(WorkplacePresenceEvent)
+            .where(WorkplacePresenceEvent.entry_id == entry_id)
+            .order_by(WorkplacePresenceEvent.event_type)
+        ).all()
+        assert {event.idempotency_key for event in events} == {
+            "recreate-arrival",
+            "recreate-departure",
+        }
+        assert all(event.time_slot_id is None for event in events)
+
+
 def test_replay_does_not_duplicate(client, app):
     payload = {
         "event": "arrival",