server: improve rkey regex

use a more robust regex which ensures colons cannot be used in a record key unless they are valid colon escape syntax

server/src/backfill/new-records.ts

···
               continue;
             }
             const path = rkeyToUrl(rkey);
-            if (!path) {
-              console.warn("rkey not valid!");
-              continue;
-            }
+            if (!path) continue;
             if (collection !== "dev.atcities.route") continue;
 
             switch (op.action) {

server/src/utils.ts

···
  */
 export function urlToRkey(url: string): string | undefined {
   // contains 0-9A-Za-z + special valid chars and / seperator. also can contain %XX with XX being hex
-  if (!url.match(/^([a-zA-Z0-9/\-._~!$&'()*+,;=:@]|(%[0-9a-fA-F]{2}))*$/gm)) {
+  if (
+    !url.match(/^(?:[a-zA-Z0-9/\-._~!$&'()*+,;=:@]|(?:%[0-9a-fA-F]{2}))*$/gm)
+  ) {
     return;
   }
   return (
···
  * @returns {string | undefined} undefined when input is invalid
  */
 export function rkeyToUrl(rkey: string): string | undefined {
-  // contains 0-9A-Za-z .-_:~
-  if (!rkey.match(/^[A-Za-z0-9.\-_:~]*$/gm)) return;
+  // contains 0-9A-Za-z .-_~
+  // or any valid colon escape sequence
+  if (
+    !rkey.match(
+      /^(?:[A-Za-z0-9.\-_~]|(?:::)|(?::~)|(?::21)|(?::24)|(?::26)|(?::27)|(?::28)|(?::29)|(?::2A)|(?::2B)|(?::2C)|(?::3A)|(?::3B)|(?::3D)|(?::40))*$/gm
+    )
+  )
+    return;
   return rkey
     .replaceAll("::", "/")
     .replaceAll(":~", "%")