Update README.md

README.md

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 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+
+## 📦 Data Persistence Notice
+
+This Space uses **Flowise with local Chroma DB and SQLite** for storing upserted documents and chat history.
+
+### 🔒 Data will persist **only if saved to `/data`**
+- This Space is configured to store vector data in `/data/chroma`
+- Upsert records are saved in `/data/flowise.db`
+- These will persist across **restarts**
+
+### ⚠️ However, all data will be lost if the Space is rebuilt
+This happens when:
+- Any file (like the Dockerfile) is changed and pushed
+- The Space is restarted manually after a code change
+
+### ✅ Best Practice for Students
+- Wait until the bot is working before uploading documents
+- Do **not** push new code or commit changes once content is uploaded
+- If your data disappears, it’s likely because the Space was rebuilt
+
+