lnurl: expire payRequest callback ids after seven days

A callback id is read once, minutes after the metadata request, and never
again, but the pointer keys were written without an expiry and had grown
to roughly 45% of all keys in the main database. Let the set helper take
a TTL and apply one to both lnurl pointer keys.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/db.ts b/lib/db.ts
index 4e746fa2..e03fb810 100644
--- a/lib/db.ts
+++ b/lib/db.ts
@@ -130,9 +130,9 @@ export const g = async (k) => {
   }
 };
 
-export const s = (k, v) => {
+export const s = (k, v, ttl?: number) => {
   if (k === "user:null" || k === "user:undefined") fail("null user");
-  db.set(k, JSON.stringify(v));
+  db.set(k, JSON.stringify(v), ttl ? { EX: ttl } : undefined);
 };
 
 export const ga = async (k) => {