refactor(deps): remove trial auto-downgrade; expiry now non-mutating per spec

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/tests/test_get_current_active_user_no_mutation.py

@@ -0,0 +1,45 @@
+import uuid
+import pytest
+from datetime import datetime, timezone, timedelta
+from sqlalchemy import select
+from app.models.subscription import Subscription
+
+
+@pytest.mark.asyncio
+async def test_expired_trial_is_not_mutated_by_get_current_active_user(
+    test_db, client, test_user, auth_headers
+):
+    """The previous deps.py:109 logic mutated trialing→active+free on expiry.
+    That's gone. An expired-trial Subscription should retain status='trialing'
+    and current_period_end after any authenticated request."""
+    account_id = uuid.UUID(test_user["user_data"]["account_id"])
+
+    # If a Subscription already exists for this account (e.g. created by
+    # the register handler), update it; otherwise insert a new one.
+    existing = await test_db.execute(
+        select(Subscription).where(Subscription.account_id == account_id)
+    )
+    sub = existing.scalar_one_or_none()
+    expired_end = datetime.now(timezone.utc) - timedelta(hours=1)
+    if sub is None:
+        sub = Subscription(
+            account_id=account_id,
+            plan="pro",
+            status="trialing",
+            current_period_end=expired_end,
+        )
+        test_db.add(sub)
+    else:
+        sub.plan = "pro"
+        sub.status = "trialing"
+        sub.current_period_end = expired_end
+    await test_db.commit()
+
+    # Call any authenticated endpoint that goes through get_current_active_user.
+    response = await client.get("/api/v1/auth/me", headers=auth_headers)
+    assert response.status_code == 200
+
+    await test_db.refresh(sub)
+    assert sub.status == "trialing"
+    assert sub.plan == "pro"
+    assert sub.current_period_end is not None