loopdb: persist static loop-in risk decisions

Add schema, sqlc queries, store fields, and SqlStore support for
recording server confirmation-risk decisions with static loop-in swaps.
Store the decision timestamp so payment-deadline recovery can
reconstruct elapsed time after restart.

loopdb/sqlc/queries/static_address_loopin.sql

@@ -33,6 +33,22 @@ SET
 WHERE
     swap_hash = $1;
 
+-- name: RecordStaticAddressRiskDecision :exec
+UPDATE static_address_swaps
+SET
+    confirmation_risk_decision = $2,
+    confirmation_risk_decision_time = CASE
+        WHEN confirmation_risk_decision = $2 THEN
+            COALESCE(confirmation_risk_decision_time, $3)
+        ELSE $3
+    END
+WHERE
+    swap_hash = $1
+    AND NOT (
+        confirmation_risk_decision = 'rejected'
+        AND $2 = 'accepted'
+    );
+
 -- name: InsertStaticAddressMetaUpdate :exec
 INSERT INTO static_address_swap_updates (
     swap_hash,
@@ -147,7 +163,3 @@ WHERE
     d.swap_hash = $1;
 
 
-
-
-
-