fix: salt issues

packages/db/src/services/salt.service.ts

@@ -3,20 +3,6 @@ import { generateSalt } from '@openpanel/common/server';
 import { cacheableLru } from '@openpanel/redis';
 import { db } from '../prisma-client';
 
-export async function getCurrentSalt() {
-  const salt = await db.salt.findFirst({
-    orderBy: {
-      createdAt: 'desc',
-    },
-  });
-
-  if (!salt) {
-    throw new Error('No salt found');
-  }
-
-  return salt.salt;
-}
-
 export const getSalts = cacheableLru(
   'op:salt',
   async () => {
@@ -31,13 +17,9 @@ export const getSalts = cacheableLru(
       throw new Error('No salt found');
     }
 
-    if (!prev) {
-      throw new Error('No salt found');
-    }
-
     const salts = {
       current: curr.salt,
-      previous: prev.salt,
+      previous: prev?.salt ?? curr.salt,
     };
 
     return salts;