diff --git a/src/db.ts b/src/db.ts
index bf3aa41..67a00d6 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -33,15 +33,12 @@ export async function checkIdentifier(key: string): Promise<boolean> {
 }
 
 export async function markIdentifier(
-	identifier: string,
+	key: string,
 	value: boolean = true,
-	expiry?: number,
-	now: Date = new Date()
-): Promise<{ key: string }> {
-	const key = getKey(identifier, now);
+	expiry?: number
+): Promise<void> {
+	const internalValue = value ? '1' : '0';
 
-	if (expiry == undefined) await redis.set(key, value ? '1' : '0');
-	else await redis.set(key, value ? '1' : '0', 'EX', expiry);
-
-	return { key };
+	if (expiry == undefined) await redis.set(key, internalValue);
+	else await redis.set(key, internalValue, 'EX', expiry);
 }
diff --git a/src/pages/api/cron.ts b/src/pages/api/cron.ts
index 892455f..c1add8e 100644
--- a/src/pages/api/cron.ts
+++ b/src/pages/api/cron.ts
@@ -72,9 +72,9 @@ export default async function handler(
 				}
 			};
 
-		// Send notification, mark
+		// Send notification, mark (expire in 1 month)
 		await sendNotification(`${matching.message} (${matching.name})`);
-		await markIdentifier(matching.name, true, 60 * 60 * 24 * 31, now);
+		await markIdentifier(key, true, 60 * 60 * 24 * 31);
 
 		return { status: 'notified', identifier: { name: matching.name, key } };
 	}