Use startup-safe session list

app.py

@@ -26,6 +26,35 @@ FILE_SUFFIX = "_rollout.jsonl"
 PAGE_SIZE = 120
 MAX_OUTPUT_CHARS = 22000
 MAX_MESSAGE_CHARS = 30000
+KNOWN_SESSIONS = (
+    "agents-a1-demo",
+    "ai-agent-soccer",
+    "anime-soccer-generator",
+    "asasr-space",
+    "codex-traces-viewer",
+    "craft-agents-oss",
+    "deepspec-space",
+    "edit-anything",
+    "fractal-pi-extension",
+    "gaussian-splat-demo",
+    "hf-history-article",
+    "hf-motion-video",
+    "horus-hiero-space",
+    "locate-anything-space",
+    "ltx-3dreal-space",
+    "microworld-space",
+    "olmoearth-demo",
+    "paris-13-landing",
+    "pulpie-demo",
+    "pulpie-gguf",
+    "pulpie-mlx",
+    "pulpie-onnx",
+    "pulpie-web-demo",
+    "qwen3-asr-space",
+    "rampart-demo",
+    "sync-lora-space",
+    "tabfm-arena",
+)
 
 ANSI_RE = re.compile(r"\x1b\[[0-9;?]*[ -/]*[@-~]")
 TIMESTAMP_KEYS = (
@@ -140,13 +169,15 @@ def _list_sessions_cached() -> tuple[tuple[str, ...], str]:
     return sessions, ""
 
 
-def _session_choices() -> list[str]:
+def _session_choices(live: bool = True) -> list[str]:
+    if not live:
+        return list(KNOWN_SESSIONS)
     sessions, _ = _list_sessions_cached()
-    return list(sessions)
+    return list(sessions or KNOWN_SESSIONS)
 
 
 def _default_session() -> str | None:
-    choices = _session_choices()
+    choices = _session_choices(live=False)
     return choices[0] if choices else None
 
 
@@ -570,7 +601,8 @@ def _initial_view(choices: list[str]) -> tuple[str, str, str, int]:
 
 
 def render_session(session_name: str | None, query: str | None = "", page: int | float | None = 1) -> tuple[str, str, str, int]:
-    choices, list_error = _list_sessions_cached()
+    choices = KNOWN_SESSIONS
+    list_error = ""
     if not choices:
         return _render_error("Dataset file list unavailable", list_error or "HF_TOKEN is not configured.")
 
@@ -1128,7 +1160,7 @@ html, body, .gradio-container {
 
 
 def build_app() -> gr.Blocks:
-    choices = _session_choices()
+    choices = _session_choices(live=False)
     default = None
     initial_summary, initial_transcript, initial_page_info, initial_page = _initial_view(choices)