feat(models): settle_transaction op, alerts_pubkey, operator_notified_at (m017)

ADR-005 §6 groundwork. settle_transaction is a machine-wide op like
resume_cash_out; it carries the machine txid it closes and the operator's
provenance note. super_config.alerts_pubkey overrides where owed-cash
alerts go; dca_settlements.operator_notified_at stops a report resend
from re-alerting.

crud.py

@@ -739,6 +739,15 @@ async def create_settlement_idempotent(
     return await get_settlement(settlement_id)
 
 
+async def mark_settlement_notified(settlement_id: str) -> None:
+    """The operator alert for this settlement went out (ADR-005 §6)."""
+    await db.execute(
+        "UPDATE spirekeeper.dca_settlements SET operator_notified_at = :now "
+        "WHERE id = :id AND operator_notified_at IS NULL",
+        {"id": settlement_id, "now": datetime.now()},
+    )
+
+
 async def get_settlement_by_txid(
     machine_id: str, bitspire_txid: str
 ) -> DcaSettlement | None:
@@ -1927,9 +1936,9 @@ async def create_cassette_op(
         """
         INSERT INTO spirekeeper.cassette_ops
         (id, machine_id, position, op_type, bills, count, denomination,
-         created_at, created_by)
+         txid, note, created_at, created_by)
         VALUES (:id, :machine_id, :position, :op_type, :bills, :count,
-                :denomination, :created_at, :created_by)
+                :denomination, :txid, :note, :created_at, :created_by)
         """,
         {
             "id": op_id,
@@ -1939,6 +1948,8 @@ async def create_cassette_op(
             "bills": data.bills,
             "count": data.count,
             "denomination": data.denomination,
+            "txid": data.txid,
+            "note": data.note,
             "created_at": datetime.now(),
             "created_by": created_by,
         },