diff --git a/checkpoint.json b/checkpoint.json
new file mode 100644
index 000000000..84b540052
--- /dev/null
+++ b/checkpoint.json
@@ -0,0 +1,57 @@
+{
+  "timestamp": "2026-03-16T05:33:34.393429Z",
+  "current_node": "setup",
+  "completed_nodes": [
+    "start",
+    "setup"
+  ],
+  "node_retries": {
+    "start": 1,
+    "setup": 1
+  },
+  "context_values": {
+    "internal.run_id": "01KKTJ51JFJYFP8KKSQZR3SGW2",
+    "internal.node_visit_count": 1,
+    "current.preamble": "Goal: Using __isnull=True on a KeyTransform should not match JSON null on SQLite and Oracle\nDescription\n\t\nThe KeyTransformIsNull lookup borrows the logic from HasKey for isnull=False, which is correct. If isnull=True, the query should only match objects that do not have the key. The query is correct for MariaDB, MySQL, and PostgreSQL. However, on SQLite and Oracle, the query also matches objects that have the key with the value null, which is incorrect.\nTo confirm, edit tests.model_fields.test_jsonfield.TestQuerying.test_isnull_key. For the first assertion, change\n\t\tself.assertSequenceEqual(\n\t\t\tNullableJSONModel.objects.filter(value__a__isnull=True),\n\t\t\tself.objs[:3] + self.objs[5:],\n\t\t)\nto\n\t\tself.assertSequenceEqual(\n\t\t\tNullableJSONModel.objects.filter(value__j__isnull=True),\n\t\t\tself.objs[:4] + self.objs[5:],\n\t\t)\nThe test previously only checks with value__a which could not catch this behavior because the value is not JSON null.\n\n",
+    "internal.retry_count.start": 1,
+    "internal.retry_count.setup": 1,
+    "current_node": "setup",
+    "failure_signature": "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.",
+    "thread.start.current_node": "setup",
+    "command.stderr": "",
+    "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
+    "internal.fidelity": "compact",
+    "failure_class": "deterministic",
+    "graph.goal": "Using __isnull=True on a KeyTransform should not match JSON null on SQLite and Oracle\nDescription\n\t\nThe KeyTransformIsNull lookup borrows the logic from HasKey for isnull=False, which is correct. If isnull=True, the query should only match objects that do not have the key. The query is correct for MariaDB, MySQL, and PostgreSQL. However, on SQLite and Oracle, the query also matches objects that have the key with the value null, which is incorrect.\nTo confirm, edit tests.model_fields.test_jsonfield.TestQuerying.test_isnull_key. For the first assertion, change\n\t\tself.assertSequenceEqual(\n\t\t\tNullableJSONModel.objects.filter(value__a__isnull=True),\n\t\t\tself.objs[:3] + self.objs[5:],\n\t\t)\nto\n\t\tself.assertSequenceEqual(\n\t\t\tNullableJSONModel.objects.filter(value__j__isnull=True),\n\t\t\tself.objs[:4] + self.objs[5:],\n\t\t)\nThe test previously only checks with value__a which could not catch this behavior because the value is not JSON null.\n",
+    "outcome": "fail",
+    "graph.rankdir": "LR",
+    "internal.thread_id": "start"
+  },
+  "logs": [],
+  "node_outcomes": {
+    "start": {
+      "status": "success",
+      "duration_ms": 0
+    },
+    "setup": {
+      "status": "fail",
+      "context_updates": {
+        "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
+        "command.stderr": ""
+      },
+      "failure": {
+        "message": "Script failed with exit code: 128\n\n## stdout\nfatal: destination path '.' already exists and is not an empty directory.\n",
+        "failure_class": "deterministic"
+      },
+      "duration_ms": 217
+    }
+  },
+  "next_node_id": "solve",
+  "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": {
+    "setup": 1,
+    "start": 1
+  }
+}
\ No newline at end of file
diff --git a/nodes/setup/script_invocation.json b/nodes/setup/script_invocation.json
new file mode 100644
index 000000000..2b019375b
--- /dev/null
+++ b/nodes/setup/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "git clone https://github.com/django/django.git . && git checkout 3f140dde51c0fe6c350acb7727bbe489a99f0632 && python -m pip install -e .",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/setup/script_timing.json b/nodes/setup/script_timing.json
new file mode 100644
index 000000000..0619f969e
--- /dev/null
+++ b/nodes/setup/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 217,
+  "exit_code": 128,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/setup/status.json b/nodes/setup/status.json
new file mode 100644
index 000000000..e2429ec3d
--- /dev/null
+++ b/nodes/setup/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "fail",
+  "notes": null,
+  "failure_reason": "Script failed with exit code: 128\n\n## stdout\nfatal: destination path '.' already exists and is not an empty directory.\n",
+  "timestamp": "2026-03-16T05:33:34.393265+00:00"
+}
\ No newline at end of file
diff --git a/nodes/start/status.json b/nodes/start/status.json
new file mode 100644
index 000000000..813803a46
--- /dev/null
+++ b/nodes/start/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": null,
+  "failure_reason": null,
+  "timestamp": "2026-03-16T05:33:34.174823+00:00"
+}
\ No newline at end of file