feat: add functional authentication

spec/schemas/database.ts

@@ -0,0 +1,15 @@
+import z, { ZodObject } from "zod";
+
+export function makeSchemaParser<TSchema extends ZodObject>(schema: TSchema): SchemaParserFn<TSchema> {
+  return ((value: unknown | unknown[]) => {
+    if (Array.isArray(value)) {
+      return value.map((value: unknown) => schema.parse(value));
+    }
+    return schema.parse(value);
+  }) as SchemaParserFn<TSchema>;
+}
+
+type SchemaParserFn<TSchema extends ZodObject> = {
+  (value: unknown): z.infer<TSchema>;
+  (value: unknown[]): z.infer<TSchema>[];
+};