feat(backend): expose GET /api/v1/readings avec fenetre bornee et pagination

apps/backend/tests/repositories/test_reading.py

@@ -6,6 +6,8 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.energy import Reading, Site
 from app.repositories.reading import ReadingRepository
+from tests.repositories.test_site import creer as creer_site
+from tests.repositories.test_site import identifiant as identifiant_site
 
 pytestmark = pytest.mark.integration
 
@@ -25,6 +27,20 @@ def lecture(site_id: str, *, timestamp: datetime, consumption_kw: float) -> Read
     )
 
 
+async def creer_lecture(session: AsyncSession, *, site_id: str, **overrides: object) -> Reading:
+    reading = Reading(
+        site_id=site_id,
+        timestamp=overrides.get("timestamp", datetime(2026, 9, 16, tzinfo=UTC)),
+        source=overrides.get("source", "api_current"),
+        consumption_kw=overrides.get("consumption_kw", 10.0),
+        data_quality=overrides.get("data_quality", "good"),
+        raw_data=overrides.get("raw_data", {}),
+    )
+    session.add(reading)
+    await session.flush()
+    return reading
+
+
 async def test_latest_by_site_keeps_only_the_most_recent_reading(session: AsyncSession) -> None:
     site_id = identifiant()
     maintenant = datetime.now(UTC)
@@ -70,3 +86,110 @@ async def test_latest_by_site_returns_one_row_per_site(session: AsyncSession) ->
     await session.rollback()
 
     assert identifiants == {premier, second}
+
+
+async def test_list_history_orders_the_readings_by_timestamp_descending(
+    session: AsyncSession,
+) -> None:
+    site = await creer_site(session)
+    depot = ReadingRepository(session)
+    ancienne = await creer_lecture(
+        session, site_id=site.site_id, timestamp=datetime(2026, 9, 1, tzinfo=UTC)
+    )
+    recente = await creer_lecture(
+        session, site_id=site.site_id, timestamp=datetime(2026, 9, 15, tzinfo=UTC)
+    )
+
+    resultats = await depot.list_history(
+        start=datetime(2026, 8, 1, tzinfo=UTC),
+        end=datetime(2026, 10, 1, tzinfo=UTC),
+        limit=100,
+        offset=0,
+    )
+    identifiants = [
+        r.reading_id for r in resultats if r.reading_id in (ancienne.reading_id, recente.reading_id)
+    ]
+    await session.rollback()
+
+    assert identifiants == [recente.reading_id, ancienne.reading_id]
+
+
+async def test_list_history_filters_by_site_id(session: AsyncSession) -> None:
+    premier = await creer_site(session)
+    second = await creer_site(session)
+    depot = ReadingRepository(session)
+    voulue = await creer_lecture(session, site_id=premier.site_id)
+    await creer_lecture(session, site_id=second.site_id)
+
+    resultats = await depot.list_history(
+        site_id=premier.site_id,
+        start=datetime(2026, 8, 1, tzinfo=UTC),
+        end=datetime(2026, 10, 1, tzinfo=UTC),
+        limit=100,
+        offset=0,
+    )
+    identifiants = [r.reading_id for r in resultats]
+    await session.rollback()
+
+    assert identifiants == [voulue.reading_id]
+
+
+async def test_list_history_excludes_readings_outside_the_window(session: AsyncSession) -> None:
+    site = await creer_site(session)
+    depot = ReadingRepository(session)
+    dedans = await creer_lecture(
+        session, site_id=site.site_id, timestamp=datetime(2026, 9, 10, tzinfo=UTC)
+    )
+    await creer_lecture(session, site_id=site.site_id, timestamp=datetime(2026, 8, 1, tzinfo=UTC))
+    await creer_lecture(session, site_id=site.site_id, timestamp=datetime(2026, 10, 1, tzinfo=UTC))
+
+    resultats = await depot.list_history(
+        site_id=site.site_id,
+        start=datetime(2026, 9, 1, tzinfo=UTC),
+        end=datetime(2026, 9, 30, tzinfo=UTC),
+        limit=100,
+        offset=0,
+    )
+    identifiants = [r.reading_id for r in resultats]
+    await session.rollback()
+
+    assert identifiants == [dedans.reading_id]
+
+
+async def test_list_history_respects_limit_and_offset(session: AsyncSession) -> None:
+    site = await creer_site(session)
+    depot = ReadingRepository(session)
+    lectures = [
+        await creer_lecture(
+            session, site_id=site.site_id, timestamp=datetime(2026, 9, jour, tzinfo=UTC)
+        )
+        for jour in (1, 2, 3)
+    ]
+
+    resultats = await depot.list_history(
+        site_id=site.site_id,
+        start=datetime(2026, 8, 1, tzinfo=UTC),
+        end=datetime(2026, 10, 1, tzinfo=UTC),
+        limit=1,
+        offset=1,
+    )
+    identifiants = [r.reading_id for r in resultats]
+    await session.rollback()
+
+    assert identifiants == [lectures[1].reading_id]
+
+
+async def test_list_history_returns_an_empty_list_when_there_is_nothing(
+    session: AsyncSession,
+) -> None:
+    depot = ReadingRepository(session)
+
+    resultats = await depot.list_history(
+        site_id=identifiant_site(),
+        start=datetime(2026, 8, 1, tzinfo=UTC),
+        end=datetime(2026, 10, 1, tzinfo=UTC),
+        limit=100,
+        offset=0,
+    )
+
+    assert list(resultats) == []