Update app.py

app.py

@@ -11,13 +11,30 @@ from settings import SNAPSHOT_PATH, PERSIST_CONTENT
 from audit_log import log_event, hash_summary
 from privacy import redact_text
 
-# ---------- Environment / cache ----------
+# ---------- Environment / cache (Spaces-safe, writable) ----------
+# Hugging Face caches
 os.environ.setdefault("HF_HOME", "/data/.cache/huggingface")
 os.environ.setdefault("HF_HUB_CACHE", "/data/.cache/huggingface/hub")
+os.environ.setdefault("TRANSFORMERS_CACHE", "/data/.cache/huggingface/transformers")
+
+# SentenceTransformers cache (used by retriever.py)
+os.environ.setdefault("SENTENCE_TRANSFORMERS_HOME", "/data/.cache/sentence-transformers")
+
+# Gradio temp/cache
 os.environ.setdefault("GRADIO_TEMP_DIR", "/data/gradio")
 os.environ.setdefault("GRADIO_CACHE_DIR", "/data/gradio")
-os.environ.pop("TRANSFORMERS_CACHE", None)
-for p in ["/data/.cache/huggingface/hub", "/data/gradio"]:
+
+# Disable experimental xet transport; use stable transfer
+os.environ.setdefault("HF_HUB_ENABLE_XET", "0")
+os.environ.setdefault("HF_HUB_ENABLE_HF_TRANSFER", "1")
+
+for p in [
+    "/data/.cache/huggingface",
+    "/data/.cache/huggingface/hub",
+    "/data/.cache/huggingface/transformers",
+    "/data/.cache/sentence-transformers",
+    "/data/gradio",
+]:
     try:
         os.makedirs(p, exist_ok=True)
     except Exception: