Add Chrome extension and Windows native host

native-host/history_archive_host.bat

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+@echo off
+py -3 "%~dp0history_archive_host.py"

native-host/history_archive_host.py

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+#!/usr/bin/env python3
+"""Chrome Native Messaging host: append browser visits to local SQLite."""
+import json, os, sqlite3, struct, sys
+from datetime import datetime, timezone
+from pathlib import Path
+
+ARCHIVE_DIR = Path(os.environ.get("LOCAL_HISTORY_ARCHIVE_DIR", Path.home() / "ChromeHistoryArchive"))
+DB_PATH = ARCHIVE_DIR / "history.sqlite3"
+
+def read_message():
+    raw = sys.stdin.buffer.read(4)
+    if not raw: return None
+    length = struct.unpack("=I", raw)[0]
+    if length > 20_000_000: raise ValueError("Message too large")
+    return json.loads(sys.stdin.buffer.read(length).decode("utf-8"))
+
+def send_message(value):
+    body = json.dumps(value, ensure_ascii=False).encode("utf-8")
+    sys.stdout.buffer.write(struct.pack("=I", len(body)))
+    sys.stdout.buffer.write(body)
+    sys.stdout.buffer.flush()
+
+def db():
+    ARCHIVE_DIR.mkdir(parents=True, exist_ok=True)
+    conn = sqlite3.connect(DB_PATH)
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute("""CREATE TABLE IF NOT EXISTS visits (
+      id INTEGER PRIMARY KEY, url TEXT NOT NULL, title TEXT NOT NULL DEFAULT '',
+      visit_time TEXT NOT NULL, transition TEXT, source TEXT NOT NULL,
+      archived_at TEXT NOT NULL, UNIQUE(url, visit_time, source))""")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_visits_time ON visits(visit_time)")
+    return conn
+
+def handle(message):
+    if message.get("type") != "visits" or not isinstance(message.get("visits"), list):
+        return {"ok": False, "error": "Expected a visits message"}
+    now = datetime.now(timezone.utc).isoformat()
+    rows = []
+    for visit in message["visits"]:
+        url, when = visit.get("url"), visit.get("visit_time")
+        if isinstance(url, str) and url and isinstance(when, str) and when:
+            rows.append((url, str(visit.get("title") or ""), when,
+              str(visit.get("transition") or "observed"),
+              str(visit.get("source") or "chrome-extension"), now))
+    with db() as conn:
+        conn.executemany("INSERT OR IGNORE INTO visits (url,title,visit_time,transition,source,archived_at) VALUES (?,?,?,?,?,?)", rows)
+    return {"ok": True, "archived": len(rows), "database": str(DB_PATH)}
+
+try:
+    while message := read_message():
+        try: send_message(handle(message))
+        except Exception as exc: send_message({"ok": False, "error": str(exc)})
+except Exception:
+    sys.exit(1)

native-host/si.komelt.local_history_archive.json.template

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+{
+  "name": "si.komelt.local_history_archive",
+  "description": "Local Chrome History Archive native host",
+  "path": "C:\\LOCAL_HISTORY_ARCHIVE\\history_archive_host.bat",
+  "type": "stdio",
+  "allowed_origins": ["chrome-extension://YOUR_EXTENSION_ID/"]
+}