diff --git a/app_new/meters/templates/meters/new.html b/app_new/meters/templates/meters/new.html
index 7eaaddd..ed21f44 100644
--- a/app_new/meters/templates/meters/new.html
+++ b/app_new/meters/templates/meters/new.html
@@ -10,6 +10,7 @@
+
diff --git a/tests/integration/test_checkpoint_c4_final.py b/tests/integration/test_checkpoint_c4_final.py
new file mode 100644
index 0000000..7ca0eb3
--- /dev/null
+++ b/tests/integration/test_checkpoint_c4_final.py
@@ -0,0 +1,201 @@
+from datetime import date, datetime, time, timezone
+import re
+
+from app_new.extensions import db
+from app_new.core.models import (
+ CollegeClosure, Company, ContractEquipmentAssignment, Equipment, Meter,
+ MeterReading, MeterReadingOccurrence, User, WorkSchedule,
+)
+from app_new.core.models.planning import MeterReadingSchedule
+from app_new.core.services.c4_service import (
+ _school_days, calculate_contract_usage, classify_legacy_copier_meter, create_contract,
+)
+from app_new.core.services.meter_service import create_meter
+from app_new.core.services.meter_reading_planning import (
+ create_or_update_schedule, generate_occurrences, record_occurrence_reading,
+)
+
+
+def _supplier(name):
+ row = Company(name=name)
+ db.session.add(row)
+ db.session.flush()
+ return row
+
+
+def _machine(name):
+ row = Equipment(name=name, device_type="photocopier",
+ serial_number=f"TEST_UI_C4_FINAL_{name}")
+ db.session.add(row)
+ db.session.flush()
+ return row
+
+
+def _meter(machine, name, role="COPIER_BW", current=0):
+ row = Meter(equipment=machine, name=name, meter_type="photocopieur",
+ unit="pages", contract_role=role, current_value=current)
+ db.session.add(row)
+ db.session.flush()
+ return row
+
+
+def _reading(meter, value, day):
+ row = MeterReading(
+ meter=meter, value=value,
+ reading_date=datetime.combine(day, time.min, tzinfo=timezone.utc),
+ )
+ db.session.add(row)
+ db.session.flush()
+ return row
+
+
+def test_c4_final_c2_anticipated_reading_is_exact_contract_reference(app, admin_user):
+ with app.app_context():
+ supplier = _supplier("TEST_UI_C4_FINAL_C2_SUPPLIER")
+ contract = create_contract(
+ supplier_id=supplier.id, name="TEST_UI_C4_FINAL_C2_CONTRACT",
+ start_date=date(2028, 10, 1), end_date=date(2029, 9, 30),
+ anniversary_month=10, anniversary_day=1,
+ )
+ period = contract.periods[0]
+ machine = _machine("TEST_UI_C4_FINAL_C2_MACHINE")
+ db.session.add(ContractEquipmentAssignment(
+ contract=contract, equipment=machine, entry_date=period.start_date,
+ ))
+ meter = _meter(machine, "N&B", current=1000)
+ _reading(meter, 900, date(2028, 9, 1))
+ _reading(meter, 1000, date(2028, 9, 15))
+
+ schedule = create_or_update_schedule(
+ meter=meter, frequency="FIXED_ANNUAL_DATE",
+ reference_date=date(2028, 10, 1), assigned_to_id=admin_user["id"],
+ fixed_month=10, fixed_day=1, commit=False,
+ )
+ # Le calendrier C2 connaît le vendredi comme journée travaillée.
+ db.session.add(WorkSchedule(
+ user_id=admin_user["id"], day_of_week=4,
+ start_time=time(8), end_time=time(17), is_active=True,
+ ))
+ db.session.flush()
+ generate_occurrences(
+ start_date=date(2028, 10, 1), end_date=date(2028, 10, 1),
+ schedule_ids=[schedule.id],
+ )
+ occurrence = MeterReadingOccurrence.query.filter_by(
+ schedule_id=schedule.id, target_date=date(2028, 10, 1),
+ ).one()
+ assert occurrence.operational_date == date(2028, 9, 29)
+
+ processed = record_occurrence_reading(
+ occurrence_id=occurrence.id, value=1100, user_id=admin_user["id"],
+ reading_date=datetime(2028, 9, 29, tzinfo=timezone.utc),
+ )
+ db.session.expire_all()
+ assert processed.meter_reading.reading_date.date() == date(2028, 9, 29)
+ assert processed.target_date == date(2028, 10, 1)
+ _reading(meter, 1200, date(2028, 10, 15))
+ usage = calculate_contract_usage(period)
+ assert usage["quality"] == "EXACT"
+ assert usage["bw"] == 100
+
+
+def test_c4_final_early_spontaneous_reading_is_not_exact(app):
+ with app.app_context():
+ supplier = _supplier("TEST_UI_C4_FINAL_SPONTANEOUS_SUPPLIER")
+ contract = create_contract(
+ supplier_id=supplier.id, name="TEST_UI_C4_FINAL_SPONTANEOUS",
+ start_date=date(2028, 10, 1), end_date=date(2029, 9, 30),
+ anniversary_month=10, anniversary_day=1,
+ )
+ period = contract.periods[0]
+ machine = _machine("TEST_UI_C4_FINAL_SPONTANEOUS_MACHINE")
+ db.session.add(ContractEquipmentAssignment(
+ contract=contract, equipment=machine, entry_date=period.start_date,
+ ))
+ meter = _meter(machine, "N&B", current=1000)
+ _reading(meter, 900, date(2028, 9, 1))
+ _reading(meter, 1000, date(2028, 9, 15))
+ _reading(meter, 1100, date(2028, 9, 29))
+ _reading(meter, 1200, date(2028, 10, 15))
+ usage = calculate_contract_usage(period)
+ assert usage["quality"] in {"ESTIMATED", "PARTIAL"}
+
+
+def test_c4_final_legacy_roles_are_safe_and_explicit(app):
+ with app.app_context():
+ machine = _machine("TEST_UI_C4_FINAL_LEGACY_MACHINE")
+ bw = _meter(machine, "N&B", role="NONE")
+ color = _meter(machine, "Couleur", role="NONE")
+ ambiguous = _meter(machine, "Heures fonctionnement", role="NONE")
+ assert classify_legacy_copier_meter(bw, commit=False) == "COPIER_BW"
+ assert classify_legacy_copier_meter(color, commit=False) == "COPIER_COLOR"
+ assert classify_legacy_copier_meter(ambiguous, commit=False) == "NONE"
+ assert bw.contract_role == "COPIER_BW"
+ assert color.contract_role == "COPIER_COLOR"
+ assert ambiguous.contract_role == "NONE"
+
+
+def test_c4_final_meter_contract_role_can_be_edited_http(app, admin_user, authenticated_client):
+ with app.app_context():
+ machine = _machine("TEST_UI_C4_FINAL_HTTP_MACHINE")
+ meter = create_meter(name="Compteur historique", meter_type="photocopieur",
+ unit="pages", contract_role="NONE", equipment_id=machine.id)
+ meter_id = meter.id
+ machine_id = machine.id
+ db.session.commit()
+ assert db.session.get(Meter, meter_id) is not None
+ with app.app_context():
+ token_page = authenticated_client.get(f'/meters/{meter_id}/edit')
+ assert token_page.status_code == 200
+ token = re.search(r'name="csrf_token" value="([^"]+)"',
+ token_page.get_data(as_text=True)).group(1)
+ response = authenticated_client.post(
+ f"/meters/{meter_id}/edit", data={
+ "name": "Compteur historique", "meter_type": "photocopieur", "unit": "pages",
+ "scope_type": "equipment", "scope_id": machine_id,
+ "contract_role": "COPIER_BW", "parent_id": "", "csrf_token": token,
+ }, follow_redirects=False,
+ )
+ assert response.status_code == 302, response.get_data(as_text=True)
+ assert db.session.get(Meter, meter_id).contract_role == "COPIER_BW"
+ response = authenticated_client.post(
+ f"/meters/{meter_id}/edit", data={
+ "name": "Compteur historique", "meter_type": "photocopieur", "unit": "pages",
+ "scope_type": "equipment", "scope_id": machine_id,
+ "contract_role": "NONE", "parent_id": "", "csrf_token": token,
+ }, follow_redirects=False,
+ )
+ assert response.status_code == 302
+ assert db.session.get(Meter, meter_id).contract_role == "NONE"
+
+
+def test_c4_final_copier_estimation_uses_school_days_not_calendar_days(app):
+ with app.app_context():
+ supplier = _supplier("TEST_UI_C4_FINAL_SCHOOL_SUPPLIER")
+ contract = create_contract(
+ supplier_id=supplier.id, name="TEST_UI_C4_FINAL_SCHOOL",
+ start_date=date(2026, 2, 9), end_date=date(2026, 12, 31),
+ anniversary_month=2, anniversary_day=1,
+ )
+ period = contract.periods[0]
+ machine = _machine("TEST_UI_C4_FINAL_SCHOOL_MACHINE")
+ db.session.add(ContractEquipmentAssignment(
+ contract=contract, equipment=machine, entry_date=period.start_date,
+ ))
+ meter = _meter(machine, "N&B", current=2600)
+ # 30 jours calendaires, dont 7 jours de fermeture en semaine :
+ # 1 500 pages / 15 jours scolaires = 100 pages/jour scolaire.
+ db.session.add(CollegeClosure(
+ name="TEST_UI_C4_FINAL_VACANCES", start_date=date(2026, 1, 5),
+ end_date=date(2026, 1, 13), closure_type="vacances", work_hours_type="none",
+ ))
+ db.session.flush()
+ assert _school_days(date(2026, 1, 1), date(2026, 1, 30)) == 15
+ assert _school_days(date(2026, 2, 9), date(2026, 2, 14)) == 5
+ _reading(meter, 1000, date(2026, 1, 1))
+ _reading(meter, 2500, date(2026, 1, 31))
+ _reading(meter, 2600, date(2026, 2, 12))
+ usage = calculate_contract_usage(period)
+ # 3 jours scolaires manquants en février : 300 pages estimées.
+ assert usage["quality"] == "ESTIMATED"
+ assert 290 <= usage["bw"] <= 310