diff --git a/app/__init__.py b/app/__init__.py
index 2a26f37..fbedfe9 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -24,6 +24,15 @@ from flask_sqlalchemy import SQLAlchemy
 db = SQLAlchemy()
 
 
+def _enable_sqlite_foreign_keys(dbapi_connection, connection_record):
+    """Active les contraintes de clés étrangères sur chaque connexion SQLite."""
+    cursor = dbapi_connection.cursor()
+    try:
+        cursor.execute("PRAGMA foreign_keys=ON")
+    finally:
+        cursor.close()
+
+
 def _migrate_db(app):
     """Applique les migrations de schéma manquantes de manière incrémentale (sans Alembic).
 
@@ -182,6 +191,9 @@ def create_app(
         app.config["HOME_ASSISTANT"] = get_home_assistant_config()
 
     db.init_app(app)
+    with app.app_context():
+        if db.engine.dialect.name == "sqlite":
+            sa.event.listen(db.engine, "connect", _enable_sqlite_foreign_keys)
     app.jinja_env.filters["date_fr"] = _date_fr
     app.jinja_env.filters["day_type_fr"] = _day_type_fr
 
diff --git a/app/models.py b/app/models.py
index 0f3238a..587f659 100644
--- a/app/models.py
+++ b/app/models.py
@@ -37,6 +37,9 @@ class WorkEntry(db.Model):
     time_slots: so.Mapped[list["TimeSlot"]] = so.relationship(
         back_populates="entry", cascade="all, delete-orphan", order_by="TimeSlot.start_time"
     )
+    presence_events: so.Mapped[list["WorkplacePresenceEvent"]] = so.relationship(
+        back_populates="entry", cascade="all, delete-orphan"
+    )
 
     def total_minutes(self) -> int:
         """
@@ -86,6 +89,50 @@ class TimeSlot(db.Model):
     end_time: so.Mapped[time] = so.mapped_column(sa.Time, nullable=False)
 
     entry: so.Mapped["WorkEntry"] = so.relationship(back_populates="time_slots")
+    presence_events: so.Mapped[list["WorkplacePresenceEvent"]] = so.relationship(
+        back_populates="time_slot", passive_deletes=True
+    )
+
+
+class WorkplacePresenceEvent(db.Model):
+    """Événement de présence reçu de Home Assistant.
+
+    ``received_at`` est un instant normalisé en UTC, stocké naïf selon la convention
+    actuelle de l'application. À l'inverse, ``occurred_at`` est l'heure murale naïve
+    dans ``Europe/Paris`` et ``local_date`` est le jour local dérivé de cette heure.
+    Cette distinction est volontaire : elle sera utilisée par le service métier futur
+    pour rattacher les arrivées et départs aux journées, notamment autour de minuit.
+    """
+
+    __tablename__ = "workplace_presence_events"
+    __table_args__ = (
+        sa.CheckConstraint("event_type IN ('arrival', 'departure')", name="ck_presence_event_type"),
+        sa.Index("ix_presence_events_local_date", "local_date"),
+        sa.Index("ix_presence_events_entry_id", "entry_id"),
+    )
+
+    id: so.Mapped[int] = so.mapped_column(primary_key=True)
+    idempotency_key: so.Mapped[str] = so.mapped_column(sa.String(255), unique=True, nullable=False)
+    event_type: so.Mapped[str] = so.mapped_column(sa.String(9), nullable=False)
+    received_at: so.Mapped[datetime] = so.mapped_column(sa.DateTime, nullable=False)
+    # Heure locale Europe/Paris, sans fuseau : ne pas la traiter comme un instant UTC.
+    occurred_at: so.Mapped[datetime] = so.mapped_column(sa.DateTime, nullable=False)
+    local_date: so.Mapped[date] = so.mapped_column(sa.Date, nullable=False)
+    entry_id: so.Mapped[int] = so.mapped_column(
+        sa.ForeignKey("work_entries.id", ondelete="CASCADE"), nullable=False
+    )
+    time_slot_id: so.Mapped[int | None] = so.mapped_column(
+        sa.ForeignKey("time_slots.id", ondelete="SET NULL"), nullable=True
+    )
+    created_at: so.Mapped[datetime] = so.mapped_column(
+        sa.DateTime, default=lambda: datetime.now(UTC), nullable=False
+    )
+    processed_at: so.Mapped[datetime | None] = so.mapped_column(sa.DateTime, nullable=True)
+
+    entry: so.Mapped["WorkEntry"] = so.relationship(back_populates="presence_events")
+    time_slot: so.Mapped["TimeSlot | None"] = so.relationship(
+        back_populates="presence_events", passive_deletes=True
+    )
 
 
 class LeaveBalance(db.Model):
diff --git a/docs/onboarding.md b/docs/onboarding.md
index 52f29a5..58f3fca 100644
--- a/docs/onboarding.md
+++ b/docs/onboarding.md
@@ -120,6 +120,14 @@ La base de données stocke l'activité saisie par l'utilisateur :
 - **`work_entries`** : Une ligne par jour saisi (date, type de jour, ID du trajet, ID du véhicule, commentaire, timestamps).
 - **`time_slots`** : Les plages horaires travaillées associées à une journée (heure de début, heure de fin, ID de l'entrée).
 - **`leave_balance`** : Les quotas annuels de congés et de RTT (année, total congés, total RTT).
+- **`workplace_presence_events`** : Les événements reçus de Home Assistant, avec une clé d'idempotence unique et leurs liens vers une journée et, facultativement, une plage horaire.
+
+Les événements de présence stockent `received_at` comme un timestamp UTC naïf,
+conformément à la convention existante des métadonnées. `occurred_at` est différent :
+il représente une heure locale Europe/Paris naïve, et `local_date` est le jour local
+qui en est dérivé. Une arrivée non encore rattachée à une plage est identifiée par
+`event_type = "arrival"` et `time_slot_id IS NULL`; la signification de
+`processed_at` sera précisée par le service métier de l'étape suivante.
 
 ---
 
diff --git a/tests/test_app_factory.py b/tests/test_app_factory.py
index 2ab1ebe..b531b53 100644
--- a/tests/test_app_factory.py
+++ b/tests/test_app_factory.py
@@ -9,3 +9,8 @@ def test_app_fixture_uses_one_in_memory_database_connection(app):
         assert str(db.engine.url) == "sqlite:///:memory:"
         assert isinstance(db.engine.pool, StaticPool)
         assert sa.inspect(db.engine).has_table("work_entries")
+
+
+def test_sqlite_foreign_keys_are_enabled(app):
+    with app.app_context():
+        assert db.session.scalar(sa.text("PRAGMA foreign_keys")) == 1
diff --git a/tests/test_models.py b/tests/test_models.py
new file mode 100644
index 0000000..ec1f31b
--- /dev/null
+++ b/tests/test_models.py
@@ -0,0 +1,111 @@
+from datetime import date, datetime, time
+
+import pytest
+import sqlalchemy as sa
+from sqlalchemy.exc import IntegrityError
+
+from app import db
+from app.models import TimeSlot, WorkEntry, WorkplacePresenceEvent
+
+
+def make_entry() -> WorkEntry:
+    return WorkEntry(date=date(2026, 8, 13), day_type="WORK")
+
+
+def make_event(entry: WorkEntry, key: str = "ha-arrival-1") -> WorkplacePresenceEvent:
+    return WorkplacePresenceEvent(
+        idempotency_key=key,
+        event_type="arrival",
+        received_at=datetime(2026, 8, 13, 6, 23, 10),
+        occurred_at=datetime(2026, 8, 13, 8, 23, 10),
+        local_date=date(2026, 8, 13),
+        entry=entry,
+    )
+
+
+def test_presence_event_creation_and_relations(app):
+    with app.app_context():
+        entry = make_entry()
+        slot = TimeSlot(start_time=time(8), end_time=time(12), entry=entry)
+        event = make_event(entry)
+        event.time_slot = slot
+        db.session.add(entry)
+        db.session.commit()
+
+        assert event.entry is entry
+        assert event in entry.presence_events
+        assert event.time_slot is slot
+        assert event in slot.presence_events
+        assert event.processed_at is None
+
+
+def test_idempotency_key_is_unique(app):
+    with app.app_context():
+        entry = make_entry()
+        db.session.add_all([entry, make_event(entry), make_event(entry, "ha-arrival-1")])
+        with pytest.raises(IntegrityError):
+            db.session.commit()
+        db.session.rollback()
+
+
+def test_event_type_check_constraint(app):
+    with app.app_context():
+        entry = make_entry()
+        event = make_event(entry)
+        event.event_type = "unknown"
+        db.session.add_all([entry, event])
+        with pytest.raises(IntegrityError):
+            db.session.commit()
+        db.session.rollback()
+
+
+def test_time_slot_link_is_nullable_and_set_null_on_slot_delete(app):
+    with app.app_context():
+        entry = make_entry()
+        slot = TimeSlot(start_time=time(8), end_time=time(12), entry=entry)
+        event = make_event(entry)
+        event.time_slot = slot
+        db.session.add(entry)
+        db.session.commit()
+
+        db.session.delete(slot)
+        db.session.commit()
+
+        assert db.session.get(WorkplacePresenceEvent, event.id).time_slot_id is None
+
+
+def test_events_cascade_when_work_entry_is_deleted(app):
+    with app.app_context():
+        entry = make_entry()
+        db.session.add(make_event(entry))
+        db.session.commit()
+        event_id = entry.presence_events[0].id
+
+        db.session.delete(entry)
+        db.session.commit()
+
+        assert db.session.get(WorkplacePresenceEvent, event_id) is None
+
+
+def test_create_all_adds_presence_table_without_losing_existing_entries(app):
+    with app.app_context():
+        db.session.add(make_entry())
+        db.session.commit()
+        db.session.execute(sa.text("DROP TABLE workplace_presence_events"))
+        db.session.commit()
+
+        db.create_all()
+
+        assert db.session.scalar(sa.select(sa.func.count()).select_from(WorkEntry)) == 1
+        assert sa.inspect(db.engine).has_table("workplace_presence_events")
+
+
+def test_create_all_creates_all_tables_on_empty_sqlite_database(app):
+    with app.app_context():
+        db.drop_all()
+        db.create_all()
+
+        inspector = sa.inspect(db.engine)
+        assert inspector.has_table("work_entries")
+        assert inspector.has_table("time_slots")
+        assert inspector.has_table("workplace_presence_events")