feat: changed backend-pg to backend

backend/src/lib/zod/index.ts

@@ -0,0 +1,12 @@
+import { z,ZodTypeAny } from "zod";
+
+// this is a patched zod string to remove empty string to undefined
+export const zpStr = <T extends ZodTypeAny>(
+  schema: T,
+  opt: { stripNull: boolean } = { stripNull: true }
+) =>
+  z.preprocess((val) => {
+    if (opt.stripNull && val === null) return undefined;
+    if (typeof val !== "string") return val;
+    return val.trim() || undefined;
+  }, schema);