wk:auth:feat: implement secondary storage for betterAuth using DEEPCRAWL_AUTH_KV

Author: lumpinif

apps/workers/auth/src/lib/better-auth/index.tsx

@@ -9,5 +9,24 @@ export function createAuth(env: CloudflareBindings) {
 
   return betterAuth({
     ...authConfigs,
+    secondaryStorage: {
+      get: async (key: string) => {
+        return env.DEEPCRAWL_AUTH_KV.get(key);
+      },
+      set: async (key: string, value: string, ttl?: number) => {
+        return env.DEEPCRAWL_AUTH_KV.put(
+          key,
+          value,
+          ttl ? { expirationTtl: ttl } : undefined,
+        );
+      },
+      delete: async (key: string) => {
+        return env.DEEPCRAWL_AUTH_KV.delete(key);
+      },
+    },
+    rateLimit: {
+      ...authConfigs.rateLimit,
+      storage: 'secondary-storage',
+    },
   });
 }