feat(backend): add Remittance + CasAdjustment ORM models

backend/tests/test_db_models.py

@@ -9,7 +9,7 @@ from decimal import Decimal
 import pytest
 
 from cyclone import db
-from cyclone.db import Base, Batch, Claim, ClaimState
+from cyclone.db import Base, Batch, CasAdjustment, Claim, ClaimState, Remittance
 
 
 @pytest.fixture(autouse=True)
@@ -155,3 +155,64 @@ def test_batch_cascade_delete_drops_claims():
     with db.SessionLocal()() as s:
         assert s.get(Batch, "b1") is None
         assert s.get(Claim, "CLM-1") is None
+
+
+def test_create_and_query_remittance():
+    with db.SessionLocal()() as s:
+        s.add(Batch(
+            id="b1", kind="835", input_filename="x",
+            parsed_at=datetime(2026, 6, 19, tzinfo=timezone.utc),
+        ))
+        r = Remittance(
+            id="CLP-1",
+            batch_id="b1",
+            payer_claim_control_number="CLP-1",
+            status_code="1",
+            total_charge=Decimal("124.00"),
+            total_paid=Decimal("124.00"),
+            received_at=datetime(2026, 6, 19, tzinfo=timezone.utc),
+            service_date=date(2026, 6, 1),
+            is_reversal=False,
+        )
+        s.add(r)
+        s.commit()
+
+    with db.SessionLocal()() as s:
+        loaded = s.get(Remittance, "CLP-1")
+        assert loaded is not None
+        assert loaded.status_code == "1"
+        assert loaded.total_paid == Decimal("124.00")
+        assert loaded.is_reversal is False
+        assert loaded.adjustment_amount == Decimal("0")  # default
+
+
+def test_cas_adjustment_aggregation():
+    """Sum of CAS rows for a Remittance equals expected total."""
+    with db.SessionLocal()() as s:
+        s.add(Batch(
+            id="b1", kind="835", input_filename="x",
+            parsed_at=datetime(2026, 6, 19, tzinfo=timezone.utc),
+        ))
+        r = Remittance(
+            id="CLP-1", batch_id="b1",
+            payer_claim_control_number="CLP-1", status_code="1",
+            total_charge=Decimal("124.00"), total_paid=Decimal("62.00"),
+            received_at=datetime(2026, 6, 19, tzinfo=timezone.utc),
+        )
+        s.add(r)
+        s.flush()
+        s.add_all([
+            CasAdjustment(remittance_id="CLP-1", group_code="CO", reason_code="45",
+                          amount=Decimal("30.00")),
+            CasAdjustment(remittance_id="CLP-1", group_code="PR", reason_code="1",
+                          amount=Decimal("32.00")),
+        ])
+        s.commit()
+
+    from sqlalchemy import select, func
+    with db.SessionLocal()() as s:
+        total = s.execute(
+            select(func.sum(CasAdjustment.amount))
+            .where(CasAdjustment.remittance_id == "CLP-1")
+        ).scalar_one()
+        assert total == Decimal("62.00")