diff --git a/CLAUDE.md b/CLAUDE.md
index 51f9c89..1ebeabb 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -45,7 +45,7 @@ Client → Traefik (HTTPS) → FastAPI (Python, :8000) ↔ Node.js Worker (:3001
 Three tables in SQLite:
 
 - **topics**: id (UUID), name (unique), system_prompt, summary, model (nullable), timestamps
-- **requests**: id (UUID), session_id, topic_id (FK), prompt, result, error, model, summarize (bool), status (pending/processing/completed/failed), timestamps
+- **requests**: id (UUID), session_id, sdk_conversation_id, topic_id (FK), prompt, result, error, model, summarize (bool), status (pending/processing/completed/failed), timestamps
 - **closed_sessions**: session_id (PK), closed_at
 
 ## API Endpoints
@@ -62,12 +62,18 @@ All require `X-Api-Key` header. All responses use envelope: `{success, data, err
 
 1. `POST /api/requests` → 202 Accepted (queued)
 2. Background loop picks oldest pending, calls worker `POST /process`
-3. Worker runs Claude Code SDK (`query()`) with optional session resume
-4. Result stored in DB; optional incremental summary appended to topic
+3. Worker runs Claude Code SDK (`query()` async iterable) with optional session resume
+4. Result stored in DB; SDK conversation ID saved in `sdk_conversation_id`; optional incremental summary appended to topic
 5. Client polls `GET /api/requests/{id}` for result
 
 Model resolution: request-level > topic-level > `CLAUDE_MODEL` env var.
 
+### Multi-turn sessions
+
+- `session_id: "new"` → stored as NULL; after completion, set to SDK's conversation ID
+- Custom `session_id` → preserved as-is; SDK conversation ID stored separately in `sdk_conversation_id`
+- Resume logic: queue looks up `sdk_conversation_id` from previous completed requests in the same session; only passes it to worker if found (avoids resume on non-existent SDK sessions)
+
 ## Commands
 
 ```bash
diff --git a/README.md b/README.md
index 7b4080a..8b66527 100644
--- a/README.md
+++ b/README.md
@@ -81,3 +81,23 @@ curl -X POST http://localhost:8000/api/requests \
 curl http://localhost:8000/api/requests/ID_RICHIESTA \
   -H "X-Api-Key: TUA_KEY"
 ```
+
+### Sessioni multi-turn
+
+```bash
+# Primo messaggio: session_id "new" o un ID personalizzato
+curl -X POST http://localhost:8000/api/requests \
+  -H "X-Api-Key: TUA_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"prompt": "Mi chiamo Marco.", "topic_id": "ID_TOPIC", "session_id": "new"}'
+
+# Il risultato contiene il session_id (generato dall'SDK)
+# Usalo per i messaggi successivi nella stessa conversazione
+curl -X POST http://localhost:8000/api/requests \
+  -H "X-Api-Key: TUA_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"prompt": "Come mi chiamo?", "topic_id": "ID_TOPIC", "session_id": "SESSION_ID_DAL_RISULTATO"}'
+```
+
+Il campo `sdk_conversation_id` nella risposta contiene l'ID interno della conversazione
+Claude Code SDK, usato automaticamente per il resume nei turni successivi.