Show local conversation activity in web console

apps/device-host-agent/host_agent/conversation_log.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import json
+import sqlite3
 from datetime import UTC, datetime
 from pathlib import Path
 from threading import Lock
@@ -8,17 +9,35 @@ from typing import Any
 
 
 class ConversationLogStore:
-    """Append-only local audit log for chat and tool activity."""
+    """SQLite-backed local audit log for chat and tool activity."""
 
     def __init__(self, path: str | Path) -> None:
         self.path = Path(path)
         self._lock = Lock()
+        self.path.parent.mkdir(parents=True, exist_ok=True)
+        with self._connect() as connection:
+            connection.execute("CREATE TABLE IF NOT EXISTS conversation_events (id INTEGER PRIMARY KEY AUTOINCREMENT, occurred_at TEXT NOT NULL, event_type TEXT NOT NULL, payload_json TEXT NOT NULL)")
 
     def append(self, event: dict[str, Any]) -> None:
-        record = {"timestamp": datetime.now(UTC).isoformat(), **_safe(event)}
-        self.path.parent.mkdir(parents=True, exist_ok=True)
-        with self._lock, self.path.open("a", encoding="utf-8") as stream:
-            stream.write(json.dumps(record, ensure_ascii=True, default=str) + "\n")
+        with self._lock, self._connect() as connection:
+            connection.execute("INSERT INTO conversation_events (occurred_at, event_type, payload_json) VALUES (?, ?, ?)", (datetime.now(UTC).isoformat(), str(event.get("type") or "event"), json.dumps(_safe(event), ensure_ascii=True, default=str)))
+
+    def list_recent(self, *, limit: int = 200) -> list[dict[str, Any]]:
+        with self._connect() as connection:
+            rows = connection.execute("SELECT id, occurred_at, event_type, payload_json FROM conversation_events ORDER BY id DESC LIMIT ?", (max(1, min(limit, 1000)),)).fetchall()
+        result = []
+        for row in rows:
+            try:
+                payload = json.loads(row["payload_json"])
+            except (TypeError, ValueError):
+                payload = {}
+            result.append({"id": row["id"], "occurred_at": row["occurred_at"], "event_type": row["event_type"], **payload})
+        return result
+
+    def _connect(self) -> sqlite3.Connection:
+        connection = sqlite3.connect(self.path)
+        connection.row_factory = sqlite3.Row
+        return connection
 
 
 def _safe(value: Any) -> Any: