diff --git a/pyproject.toml b/pyproject.toml
index 7fb63b0..cb22de8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -445,6 +445,7 @@ plugins = [
 [tool.pyrefly]
 search_path = [ "." ]
 errors.non-exhaustive-match = "error"
+preset = "strict"
 
 [tool.pyright]
 typeCheckingMode = "strict"
diff --git a/src/coderpad/screen_types.py b/src/coderpad/screen_types.py
index 594d9a2..6b02e89 100644
--- a/src/coderpad/screen_types.py
+++ b/src/coderpad/screen_types.py
@@ -1,6 +1,6 @@
 """Types for the CoderPad Screen API."""
 
-from typing import ClassVar, Self, TypeGuard
+from typing import ClassVar, Self, TypeGuard, override
 
 from beartype import beartype
 from pydantic import BaseModel, ConfigDict, Field, model_validator
@@ -366,6 +366,7 @@ def from_dict(cls, data: dict[str, object]) -> Self:
             else None,
         )
 
+    @override
     def __repr__(self) -> str:
         """Return a concise debug representation."""
         return (
diff --git a/src/coderpad/types.py b/src/coderpad/types.py
index 89a8238..acc9498 100644
--- a/src/coderpad/types.py
+++ b/src/coderpad/types.py
@@ -422,6 +422,17 @@ def apply(self, *, contents: str) -> str:
         return "".join(updated)
 
 
+def _history_sort_key(
+    item: tuple[str, PadHistoryEntryDict],
+    /,
+) -> tuple[int, str]:
+    """Return the sort key for a Firebase history entry: timestamp, then
+    ID.
+    """
+    entry_id, entry = item
+    return (entry["t"], entry_id)
+
+
 @beartype
 class PadHistory(list[PadHistoryEntry]):
     """Chronologically ordered editor history for a pad file."""
@@ -442,7 +453,7 @@ def from_dict(
         """
         ordered_entries = sorted(
             data.items(),
-            key=lambda item: (item[1]["t"], item[0]),
+            key=_history_sort_key,
         )
         history = cls()
         for entry_id, entry in ordered_entries: