Avoid generating key inside checkIdentifier

Small formatting changes in .env.example / next.config.js

.env.example

@@ -1,4 +1,4 @@
-# The password for the online interface (required)
+# The key used for the online interface & API endpoints (required)
 API_KEY=
 # Cronitor Account Credentials (required)
 CRONITOR_ACCOUNT_ID=

next.config.js

@@ -1,6 +1,6 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  reactStrictMode: true,
+	reactStrictMode: true
 };
 
 module.exports = nextConfig;

src/db.ts

@@ -28,17 +28,8 @@ export function getKey(identifier: string, now: Date) {
 	return format(now, 'yyyy-MM-dd') + ':' + identifier;
 }
 
-// TODO; Move away from generating key inside these functions while also returning it.
-
-export async function checkIdentifier(
-	identifier: string,
-	now: Date = new Date()
-): Promise<{ marked: boolean; key: string }> {
-	const key = getKey(identifier, now);
-	return {
-		marked: (await redis.get(key)) === '1',
-		key
-	};
+export async function checkIdentifier(key: string): Promise<boolean> {
+	return (await redis.get(key)) === '1';
 }
 
 export async function markIdentifier(