refactor packages

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

@@ -0,0 +1,37 @@
+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 async function getSalts() {
+  const [curr, prev] = await db.salt.findMany({
+    orderBy: {
+      createdAt: 'desc',
+    },
+    take: 2,
+  });
+
+  if (!curr) {
+    throw new Error('No salt found');
+  }
+
+  if (!prev) {
+    throw new Error('No previous salt found');
+  }
+
+  return {
+    current: curr.salt,
+    previous: prev.salt,
+  };
+}