diff --git a/checkpoint.json b/checkpoint.json
new file mode 100644
index 000000000..b2b35349c
--- /dev/null
+++ b/checkpoint.json
@@ -0,0 +1,57 @@
+{
+  "timestamp": "2026-03-16T12:04:54.380547Z",
+  "current_node": "setup",
+  "completed_nodes": [
+    "start",
+    "setup"
+  ],
+  "node_retries": {
+    "setup": 1,
+    "start": 1
+  },
+  "context_values": {
+    "internal.node_visit_count": 1,
+    "internal.retry_count.setup": 1,
+    "internal.fidelity": "compact",
+    "graph.goal": "Possible bug in io.fits related to D exponents\nI came across the following code in ``fitsrec.py``:\r\n\r\n```python\r\n        # Replace exponent separator in floating point numbers\r\n        if 'D' in format:\r\n            output_field.replace(encode_ascii('E'), encode_ascii('D'))\r\n```\r\n\r\nI think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.\n\n\n\n## Additional Context\n\nIt is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.",
+    "failure_class": "deterministic",
+    "current.preamble": "Goal: Possible bug in io.fits related to D exponents\nI came across the following code in ``fitsrec.py``:\r\n\r\n```python\r\n        # Replace exponent separator in floating point numbers\r\n        if 'D' in format:\r\n            output_field.replace(encode_ascii('E'), encode_ascii('D'))\r\n```\r\n\r\nI think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.\n\n\n\n## Additional Context\n\nIt is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.\n",
+    "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.",
+    "command.stderr": "",
+    "graph.rankdir": "LR",
+    "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
+    "thread.start.current_node": "setup",
+    "internal.run_id": "01KKV8D2T9CW3MSBAX6557GNDR",
+    "internal.retry_count.start": 1,
+    "outcome": "fail",
+    "internal.thread_id": "start"
+  },
+  "logs": [],
+  "node_outcomes": {
+    "start": {
+      "status": "success",
+      "duration_ms": 0
+    },
+    "setup": {
+      "status": "fail",
+      "context_updates": {
+        "command.stderr": "",
+        "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n"
+      },
+      "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": 18
+    }
+  },
+  "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": {
+    "start": 1,
+    "setup": 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..830d86ad3
--- /dev/null
+++ b/nodes/setup/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "git clone https://github.com/astropy/astropy.git . && git checkout c76af9ed6bb89bfba45b9f5bc1e635188278e2fa && python -m pip install -e .[test] --verbose",
+  "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..99d896469
--- /dev/null
+++ b/nodes/setup/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 17,
+  "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..f0f716be0
--- /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": "2026-03-16T12:04:54.380355+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..7de16009d
--- /dev/null
+++ b/nodes/start/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": null,
+  "failure_reason": null,
+  "timestamp": "2026-03-16T12:04:54.361075+00:00"
+}
\ No newline at end of file