feat(expense): add persistent zero-entry receipt association

server/tests/test_alembic_migrations.py

@@ -19,7 +19,7 @@ from app.db.schema_ownership import MIGRATION_OWNED_TABLES, create_legacy_schema
 
 MIGRATION_TEST_DATABASE_URL = os.getenv("MIGRATION_TEST_DATABASE_URL", "").strip()
 LEGACY_PROBE_TABLE = "legacy_migration_probe_records"
-HEAD_REVISION = "20260714_0005"
+HEAD_REVISION = "20260716_0006"
 SERVER_DIR = Path(__file__).resolve().parents[1]
 ALEMBIC_INI_PATH = SERVER_DIR / "alembic.ini"
 
@@ -274,11 +274,27 @@ def _assert_head_schema(engine: Engine) -> None:
         "uq_memory_evidence_links_entry_case",
         ("tenant_id", "memory_entry_id", "expense_case_id"),
     )
+    _assert_unique_constraint(
+        engine,
+        "attachment_association_jobs",
+        "uq_attachment_association_jobs_owner_dedupe",
+        ("tenant_id", "owner_username", "dedupe_key", "generation"),
+    )
     _assert_check_constraint(
         engine,
         "memory_entries",
         "ck_memory_entries_expired_fields",
     )
+    _assert_check_constraint(
+        engine,
+        "attachment_association_jobs",
+        "ck_attachment_association_jobs_running_lease",
+    )
+    _assert_check_constraint(
+        engine,
+        "attachment_association_jobs",
+        "ck_attachment_association_jobs_generation",
+    )
 
     _assert_indexes(
         engine,
@@ -318,6 +334,21 @@ def _assert_head_schema(engine: Engine) -> None:
             "ix_auth_sessions_tenant_username": ("tenant_id", "username"),
         },
     )
+    _assert_indexes(
+        engine,
+        "attachment_association_jobs",
+        {
+            "ix_attachment_association_jobs_owner_time": (
+                "tenant_id",
+                "owner_username",
+                "created_at",
+            ),
+            "ix_attachment_association_jobs_status_lease": (
+                "status",
+                "lease_expires_at",
+            ),
+        },
+    )
     _assert_indexes(
         engine,
         "ai_application_preview_decisions",

server/tests/test_migration_preflight.py

@@ -48,7 +48,7 @@ def test_unversioned_database_without_migration_owned_tables_is_safe(engine: Eng
 
 @pytest.mark.parametrize(
     "owned_table",
-    sorted(MIGRATION_OWNED_TABLES_BY_REVISION["20260714_0005"]),
+    sorted(MIGRATION_OWNED_TABLES_BY_REVISION["20260716_0006"]),
 )
 def test_unversioned_database_with_any_migration_owned_table_is_rejected(
     engine: Engine,
@@ -100,6 +100,11 @@ def test_known_revision_requires_and_accepts_its_exact_owned_table_set(
             "20260714_0005",
             MIGRATION_OWNED_TABLES_BY_REVISION["20260714_0005"] - {"memory_entries"},
         ),
+        (
+            "20260716_0006",
+            MIGRATION_OWNED_TABLES_BY_REVISION["20260716_0006"]
+            - {"attachment_association_jobs"},
+        ),
     ],
 )
 def test_known_revision_with_missing_or_unexpected_owned_tables_is_rejected(

server/tests/test_schema_ownership.py

@@ -20,6 +20,7 @@ def test_create_legacy_schema_never_creates_migration_owned_tables() -> None:
             "ai_decision_feedback",
             "ai_decisions",
             "auth_sessions",
+            "attachment_association_jobs",
             "business_events",
             "expense_case_links",
             "expense_cases",