feat: cron worker for renewal notifs

tests/test_notifications.py

@@ -0,0 +1,46 @@
+import asyncio
+from datetime import UTC, datetime, timedelta
+from types import SimpleNamespace
+
+from schemas.enums import NotificationType
+from services.notifications import collect_subscription_notifications
+
+
+class FakeSession:
+    def __init__(self, subscriptions_by_period):
+        self.subscriptions_by_period = iter(subscriptions_by_period)
+        self.executed = []
+        self.committed = False
+
+    async def scalars(self, _statement):
+        return next(self.subscriptions_by_period)
+
+    async def execute(self, statement):
+        self.executed.append(statement)
+        return SimpleNamespace(rowcount=1)
+
+    async def commit(self):
+        self.committed = True
+
+
+def test_collects_notification_for_each_expiry_period():
+    now = datetime(2026, 8, 20, tzinfo=UTC)
+    session = FakeSession(
+        [
+            [SimpleNamespace(id=1, expires_at=now + timedelta(days=6))],
+            [SimpleNamespace(id=2, expires_at=now + timedelta(days=2))],
+            [SimpleNamespace(id=3, expires_at=now + timedelta(hours=12))],
+            [SimpleNamespace(id=4, expires_at=now - timedelta(hours=1))],
+        ]
+    )
+
+    created = asyncio.run(collect_subscription_notifications(session, now))
+
+    assert created == len(session.executed)
+    assert session.committed
+    assert [statement.compile().params["notify_type_m0"] for statement in session.executed] == [
+        NotificationType.SEVEN_DAYS,
+        NotificationType.THREE_DAYS,
+        NotificationType.ONE_DAY,
+        NotificationType.EXPIRED,
+    ]