test(db): align PostgreSQL smoke fixtures with current schema

CHANGELOG.md

@@ -1,4 +1,7 @@
 ## [Unreleased]
+- Proposed: repair fresh-install and upgrade failures while retaining existing
+  mail and its read state. Real database smoke tests preserve the complete
+  historical upgrade path and verify the repaired installation.
 - Proposed: repair storage failures for long email and document content while
   retaining complete text and search scores. Search latency and deployment
   validation remain required before this change is released.

backend/tests/test_bootstrap_db.py

@@ -115,6 +115,10 @@ def test_schema_backfill_adds_email_indexes(monkeypatch):
         and "user_id, organization_id, date" in statement
         for statement in statements
     )
+    assert not any(
+        "on emails (user_id, organization_id, date)" in statement
+        for statement in statements
+    )
     assert any(
         "drop index if exists ix_email_records_message_id" in statement
         for statement in statements