diff --git a/checkpoint.json b/checkpoint.json
index 243efdc64..f06ec899c 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,14 +1,16 @@
 {
-  "timestamp": "2026-03-16T12:01:30.082351Z",
-  "current_node": "solve",
+  "timestamp": "2026-03-16T12:01:33.649926Z",
+  "current_node": "extract_patch",
   "completed_nodes": [
     "start",
     "setup",
-    "solve"
+    "solve",
+    "extract_patch"
   ],
   "node_retries": {
     "setup": 1,
     "start": 1,
+    "extract_patch": 1,
     "solve": 1
   },
   "context_values": {
@@ -18,19 +20,21 @@
     "last_stage": "solve",
     "graph.rankdir": "LR",
     "command.stderr": "",
-    "internal.thread_id": "setup",
+    "thread.solve.current_node": "extract_patch",
+    "internal.thread_id": "solve",
     "internal.retry_count.setup": 1,
+    "internal.retry_count.extract_patch": 1,
     "internal.node_visit_count": 1,
     "thread.setup.current_node": "solve",
     "response.solve": "The fix is applied. Both `ASCIIUsernameValidator` and `UnicodeUsernameValidator` now use `\\A` and `\\Z` instead of `^` and `$` to anchor the regex.\n\n**The problem:** Python's `$` in regex matches not only at the end of the string but also just before a trailing newline. This means a username like `\"validuser\\n\"` would incorrectly pass validation.\n\n**The fix:** Replace `^` with `\\A` (matches only at the absolute start of the string) and `$` with `\\Z` (matches only at the absolute end of the string, without the trailing-newline quirk). This ensures usernames ending with a newline are properly rejected.",
     "graph.goal": "UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n",
     "failure_class": "",
-    "current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n  - Stdout:\n    ```\n    fatal: destination path '.' already exists and is not an empty directory.\n    ```\n  - Stderr: (empty)\n\n## Context\n- failure_class: deterministic\n- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.\n",
+    "current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n  - Stdout:\n    ```\n    fatal: destination path '.' already exists and is not an empty directory.\n    ```\n  - Stderr: (empty)\n- **solve**: success\n  - Model: claude-opus-4-6, 2.6k tokens in / 985 out\n  - Files: /home/daytona/workspace/django_repo/django/contrib/auth/validators.py\n",
     "last_response": "The fix is applied. Both `ASCIIUsernameValidator` and `UnicodeUsernameValidator` now use `\\A` and `\\Z` instead of `^` and `$` to anchor the regex.\n\n**The problem:** Python's `$` in regex matches not o",
     "internal.retry_count.solve": 1,
-    "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
+    "command.output": "diff --git a/django_repo b/django_repo\n--- a/django_repo\n+++ b/django_repo\n@@ -1 +1 @@\n-Subproject commit d26b2424437dabeeca94d7900b37d2df4410da0c\n+Subproject commit d26b2424437dabeeca94d7900b37d2df4410da0c-dirty\n",
     "internal.run_id": "01KKV89S44D8W8R6E8JNCT76H6",
-    "current_node": "solve",
+    "current_node": "extract_patch",
     "thread.start.current_node": "setup",
     "failure_signature": ""
   },
@@ -73,15 +77,25 @@
         "failure_class": "deterministic"
       },
       "duration_ms": 86
+    },
+    "extract_patch": {
+      "status": "success",
+      "context_updates": {
+        "command.stderr": "",
+        "command.output": "diff --git a/django_repo b/django_repo\n--- a/django_repo\n+++ b/django_repo\n@@ -1 +1 @@\n-Subproject commit d26b2424437dabeeca94d7900b37d2df4410da0c\n+Subproject commit d26b2424437dabeeca94d7900b37d2df4410da0c-dirty\n"
+      },
+      "notes": "Script completed: git diff",
+      "duration_ms": 267
     }
   },
-  "next_node_id": "extract_patch",
+  "next_node_id": "exit",
   "loop_failure_signatures": {
     "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.": 1
   },
   "node_visits": {
     "solve": 1,
     "start": 1,
+    "extract_patch": 1,
     "setup": 1
   }
 }
\ No newline at end of file
diff --git a/nodes/extract_patch/script_invocation.json b/nodes/extract_patch/script_invocation.json
new file mode 100644
index 000000000..6d29afc80
--- /dev/null
+++ b/nodes/extract_patch/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "git diff",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/extract_patch/script_timing.json b/nodes/extract_patch/script_timing.json
new file mode 100644
index 000000000..384c3fcb4
--- /dev/null
+++ b/nodes/extract_patch/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 267,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/extract_patch/status.json b/nodes/extract_patch/status.json
new file mode 100644
index 000000000..74043c99e
--- /dev/null
+++ b/nodes/extract_patch/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Script completed: git diff",
+  "failure_reason": null,
+  "timestamp": "2026-03-16T12:01:33.649763+00:00"
+}
\ No newline at end of file
diff --git a/nodes/solve/diff.patch b/nodes/solve/diff.patch
new file mode 100644
index 000000000..52c4fd239
--- /dev/null
+++ b/nodes/solve/diff.patch
@@ -0,0 +1,7 @@
+diff --git a/django_repo b/django_repo
+new file mode 160000
+index 0000000..d26b242
+--- /dev/null
++++ b/django_repo
+@@ -0,0 +1 @@
++Subproject commit d26b2424437dabeeca94d7900b37d2df4410da0c