A lot of things.

_output/routes/_metadata.json

@@ -2,8 +2,11 @@
     "api_romhackplaza_entry_.json": {
         "hash": "5f1609f559980b44af09fd85c3b34a30"
     },
+    "api_threads_undelete.json": {
+        "hash": "3376251e185807693e0fb7dc6dcc9ee0"
+    },
     "public_clubs_.json": {
-        "hash": "a10d34d7ce33cb577dc85906353d1bb2"
+        "hash": "4fbb4a364e108ff5b30dfd57692205aa"
     },
     "public_romhackplaza_entry_.json": {
         "hash": "2c40d7266fcc22a5727830a69af2360c"

_output/routes/api_threads_undelete.json

@@ -0,0 +1,11 @@
+{
+    "route_type": "api",
+    "route_prefix": "threads",
+    "sub_name": "undelete",
+    "format": ":int<thread_id>/undelete",
+    "build_class": "",
+    "build_method": "",
+    "controller": "RomhackPlaza\\Master:Thread",
+    "context": "",
+    "action_prefix": ""
+}

_output/routes/public_clubs_.json

@@ -2,7 +2,7 @@
     "route_type": "public",
     "route_prefix": "clubs",
     "sub_name": "",
-    "format": "",
+    "format": ":int<club_id>/",
     "build_class": "",
     "build_method": "",
     "controller": "RomhackPlaza\\Master:Club",