diff --git a/src/transcription/benchmarking.py b/src/transcription/benchmarking.py
index 9f7c22b..c2c3908 100644
--- a/src/transcription/benchmarking.py
+++ b/src/transcription/benchmarking.py
@@ -13,24 +13,6 @@ class BenchmarkModel(BaseModel):
     model_config = ConfigDict(extra="forbid", frozen=True)
 
 
-class BenchmarkItem(BenchmarkModel):
-    """One private benchmark item referenced by archival identity."""
-
-    source_id: UUID
-    source_digest_sha256: str = Field(pattern=r"^[0-9a-f]{64}$")
-    categories: frozenset[str] = Field(min_length=1)
-    reference_transcription: str = Field(min_length=1)
-
-
-class BenchmarkManifest(BenchmarkModel):
-    """Versioned private benchmark definition without copied source media."""
-
-    schema_name: str = "transcription.private-benchmark"
-    schema_version: str = "1"
-    name: str = Field(min_length=1)
-    items: tuple[BenchmarkItem, ...] = Field(min_length=1)
-
-
 class EditorialAssessment(BenchmarkModel):
     """Manually reviewed errors not represented adequately by CER or WER."""
 
diff --git a/src/transcription/db/engine.py b/src/transcription/db/engine.py
index 3f8c03c..8e77d23 100644
--- a/src/transcription/db/engine.py
+++ b/src/transcription/db/engine.py
@@ -73,14 +73,3 @@ async def dispose_engine(database_url: str) -> None:
     engine = _ENGINES.pop(database_url, None)
     if engine is not None:
         await engine.dispose()
-
-
-async def dispose_all_engines() -> None:
-    while _ENGINES:
-        _, engine = _ENGINES.popitem()
-        await engine.dispose()
-
-
-async def refresh_engine(database_url: str) -> AsyncEngine:
-    await dispose_engine(database_url)
-    return get_engine(database_url)
diff --git a/src/transcription/ui/components/error_presenter.py b/src/transcription/ui/components/error_presenter.py
index 2bca9bc..07bce53 100644
--- a/src/transcription/ui/components/error_presenter.py
+++ b/src/transcription/ui/components/error_presenter.py
@@ -10,7 +10,6 @@ from typing import TypeVar
 from nicegui import ui
 
 from transcription.errors import AppError
-from transcription.errors import ErrorCategory
 from transcription.errors import canonical_error_category
 from transcription.errors import classify_unexpected_error
 
@@ -70,11 +69,3 @@ def show_error(exc: Exception, *, title: str, operation: str) -> None:
 def display_error_category(error: AppError) -> str:
     """Return the canonical UI-facing category label for an AppError."""
     return canonical_error_category(error)
-
-
-def summarize_error(exc: Exception, *, operation: str) -> str:
-    """Return short one-line summary for status labels."""
-    error = to_app_error(exc, operation=operation)
-    if error.category == ErrorCategory.INTERNAL_UNEXPECTED:
-        return f"Unexpected error (ref: {error.error_id})"
-    return f"{error.message} (ref: {error.error_id})"
diff --git a/tests/test_orphan_sweep.py b/tests/test_orphan_sweep.py
index 76d98ca..0035a47 100644
--- a/tests/test_orphan_sweep.py
+++ b/tests/test_orphan_sweep.py
@@ -31,11 +31,6 @@ REGISTRATION_DECORATOR_PREFIXES = ("router.", "app.", "ui.page")
 # rationale. Removing the code means removing the entry; adding an entry means an
 # explicit decision to keep unreferenced code.
 KNOWN_ORPHANS: dict[str, str] = {
-    "BenchmarkManifest": (
-        "Benchmark manifest model in benchmarking.py with no current caller. "
-        "Uncertain - follow-up: confirm whether the benchmarking entrypoint is still "
-        "intended before removing."
-    ),
     "DocumentService.is_document_type_referenced": (
         "Read helper currently bypassed by callers in favor of direct delete guards. "
         "Retained for now to preserve service API stability during cleanup."
@@ -92,19 +87,6 @@ KNOWN_ORPHANS: dict[str, str] = {
         "Public read helper currently unused by runtime flows, but retained as part of "
         "the SourceService API pending endpoint consolidation."
     ),
-    "dispose_all_engines": (
-        "Engine lifecycle helper in db/engine.py. Uncertain - follow-up: operational "
-        "teardown utility with no runtime or test caller."
-    ),
-    "refresh_engine": (
-        "Engine lifecycle helper in db/engine.py. Uncertain - follow-up: paired with "
-        "dispose_all_engines and equally unreferenced."
-    ),
-    "summarize_error": (
-        "Error-presentation helper in ui/components/error_presenter.py that no page or "
-        "component calls. Uncertain - follow-up: superseded by the presenter's other "
-        "entrypoints."
-    ),
 }