fix: Short VIN Storage - Issue #1

backend/src/shared-minimal/utils/validators.ts

@@ -19,12 +19,20 @@ export function isValidUUID(uuid: string): boolean {
 }
 
 export function isValidVIN(vin: string): boolean {
-  // VIN must be exactly 17 characters
+  // VIN must be exactly 17 characters (modern VIN standard since 1981)
   if (vin.length !== 17) return false;
-  
+
   // VIN cannot contain I, O, or Q
   if (/[IOQ]/i.test(vin)) return false;
-  
+
   // Must be alphanumeric
   return /^[A-HJ-NPR-Z0-9]{17}$/i.test(vin);
+}
+
+export function isValidPreModernVIN(vin: string): boolean {
+  // Pre-1981 vehicles had non-standardized VINs of varying lengths (1-17 characters)
+  if (vin.length < 1 || vin.length > 17) return false;
+
+  // Must be alphanumeric (allow I, O, Q for pre-1981 as they weren't banned yet)
+  return /^[A-Z0-9]+$/i.test(vin);
 }