Further optimize CPU usage; Improve security and performance; 4 bug fixes.

app/admin_api.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import ipaddress
+import json
 import logging
 import re
 import socket
@@ -354,6 +355,10 @@ def update_peer_site(site_id: str):
         if region_error:
             return _json_error("ValidationError", region_error, 400)
 
+    if "connection_id" in payload:
+        if payload["connection_id"] and not _connections().get(payload["connection_id"]):
+            return _json_error("ValidationError", f"Connection '{payload['connection_id']}' not found", 400)
+
     peer = PeerSite(
         site_id=site_id,
         endpoint=payload.get("endpoint", existing.endpoint),

app/iam.py

@@ -529,11 +529,13 @@ class IamService:
         return candidate if candidate in ALLOWED_ACTIONS else ""
 
     def _write_default(self) -> None:
+        access_key = secrets.token_hex(12)
+        secret_key = secrets.token_urlsafe(32)
         default = {
             "users": [
                 {
-                    "access_key": "localadmin",
+                    "access_key": access_key,
-                    "secret_key": "localadmin",
+                    "secret_key": secret_key,
                     "display_name": "Local Admin",
                     "policies": [
                         {"bucket": "*", "actions": list(ALLOWED_ACTIONS)}
@@ -542,6 +544,14 @@ class IamService:
             ]
         }
         self.config_path.write_text(json.dumps(default, indent=2))
+        print(f"\n{'='*60}")
+        print("MYFSIO FIRST RUN - ADMIN CREDENTIALS GENERATED")
+        print(f"{'='*60}")
+        print(f"Access Key: {access_key}")
+        print(f"Secret Key: {secret_key}")
+        print(f"{'='*60}")
+        print(f"Missed this? Check: {self.config_path}")
+        print(f"{'='*60}\n")
 
     def _generate_access_key(self) -> str:
         return secrets.token_hex(8)

app/s3_api.py

@@ -1004,7 +1004,8 @@ def _apply_object_headers(
     response.headers["ETag"] = f'"{etag}"'
     response.headers["Accept-Ranges"] = "bytes"
     for key, value in (metadata or {}).items():
-        response.headers[f"X-Amz-Meta-{key}"] = value
+        safe_value = _sanitize_header_value(str(value))
+        response.headers[f"X-Amz-Meta-{key}"] = safe_value
 
 
 def _maybe_handle_bucket_subresource(bucket_name: str) -> Response | None:
@@ -2342,10 +2343,12 @@ def _post_object(bucket_name: str) -> Response:
     success_action_redirect = request.form.get("success_action_redirect")
     if success_action_redirect:
         allowed_hosts = current_app.config.get("ALLOWED_REDIRECT_HOSTS", [])
+        if not allowed_hosts:
+            allowed_hosts = [request.host]
         parsed = urlparse(success_action_redirect)
         if parsed.scheme not in ("http", "https"):
             return _error_response("InvalidArgument", "Redirect URL must use http or https", 400)
-        if allowed_hosts and parsed.netloc not in allowed_hosts:
+        if parsed.netloc not in allowed_hosts:
             return _error_response("InvalidArgument", "Redirect URL host not allowed", 400)
         redirect_url = f"{success_action_redirect}?bucket={bucket_name}&key={quote(object_key)}&etag={meta.etag}"
         return Response(status=303, headers={"Location": redirect_url})

app/secret_store.py

@@ -18,6 +18,18 @@ class EphemeralSecretStore:
         self._store[token] = (payload, expires_at)
         return token
 
+    def peek(self, token: str | None) -> Any | None:
+        if not token:
+            return None
+        entry = self._store.get(token)
+        if not entry:
+            return None
+        payload, expires_at = entry
+        if expires_at < time.time():
+            self._store.pop(token, None)
+            return None
+        return payload
+
     def pop(self, token: str | None) -> Any | None:
         if not token:
             return None

app/storage.py

@@ -186,6 +186,7 @@ class ObjectStorage:
         self._cache_ttl = cache_ttl
         self._object_cache_max_size = object_cache_max_size
         self._object_key_max_length_bytes = object_key_max_length_bytes
+        self._sorted_key_cache: Dict[str, tuple[list[str], int]] = {}
 
     def _get_bucket_lock(self, bucket_id: str) -> threading.Lock:
         """Get or create a lock for a specific bucket. Reduces global lock contention."""
@@ -243,10 +244,15 @@ class ObjectStorage:
             raise BucketNotFoundError("Bucket does not exist")
 
         cache_path = self._system_bucket_root(bucket_name) / "stats.json"
+        cached_stats = None
+        cache_fresh = False
+
         if cache_path.exists():
             try:
-                if time.time() - cache_path.stat().st_mtime < cache_ttl:
+                cache_fresh = time.time() - cache_path.stat().st_mtime < cache_ttl
-                    return json.loads(cache_path.read_text(encoding="utf-8"))
+                cached_stats = json.loads(cache_path.read_text(encoding="utf-8"))
+                if cache_fresh:
+                    return cached_stats
             except (OSError, json.JSONDecodeError):
                 pass
 
@@ -255,40 +261,45 @@ class ObjectStorage:
         version_count = 0
         version_bytes = 0
 
-        for path in bucket_path.rglob("*"):
+        try:
-            if path.is_file():
+            for path in bucket_path.rglob("*"):
-                rel = path.relative_to(bucket_path)
-                if not rel.parts:
-                    continue
-                top_folder = rel.parts[0]
-                if top_folder not in self.INTERNAL_FOLDERS:
-                    stat = path.stat()
-                    object_count += 1
-                    total_bytes += stat.st_size
-
-        versions_root = self._bucket_versions_root(bucket_name)
-        if versions_root.exists():
-            for path in versions_root.rglob("*.bin"):
                 if path.is_file():
-                    stat = path.stat()
+                    rel = path.relative_to(bucket_path)
-                    version_count += 1
+                    if not rel.parts:
-                    version_bytes += stat.st_size
+                        continue
-        
+                    top_folder = rel.parts[0]
+                    if top_folder not in self.INTERNAL_FOLDERS:
+                        stat = path.stat()
+                        object_count += 1
+                        total_bytes += stat.st_size
+
+            versions_root = self._bucket_versions_root(bucket_name)
+            if versions_root.exists():
+                for path in versions_root.rglob("*.bin"):
+                    if path.is_file():
+                        stat = path.stat()
+                        version_count += 1
+                        version_bytes += stat.st_size
+        except OSError:
+            if cached_stats is not None:
+                return cached_stats
+            raise
+
         stats = {
             "objects": object_count,
             "bytes": total_bytes,
             "version_count": version_count,
             "version_bytes": version_bytes,
             "total_objects": object_count + version_count,
-            "total_bytes": total_bytes + version_bytes, 
+            "total_bytes": total_bytes + version_bytes,
         }
-        
+
         try:
             cache_path.parent.mkdir(parents=True, exist_ok=True)
             cache_path.write_text(json.dumps(stats), encoding="utf-8")
         except OSError:
             pass
-            
+
         return stats
 
     def _invalidate_bucket_stats_cache(self, bucket_id: str) -> None:
@@ -299,6 +310,34 @@ class ObjectStorage:
         except OSError:
             pass
 
+    def _update_bucket_stats_cache(
+        self,
+        bucket_id: str,
+        *,
+        bytes_delta: int = 0,
+        objects_delta: int = 0,
+        version_bytes_delta: int = 0,
+        version_count_delta: int = 0,
+    ) -> None:
+        """Incrementally update cached bucket statistics instead of invalidating.
+
+        This avoids expensive full directory scans on every PUT/DELETE by
+        adjusting the cached values directly.
+        """
+        cache_path = self._system_bucket_root(bucket_id) / "stats.json"
+        try:
+            if cache_path.exists():
+                data = json.loads(cache_path.read_text(encoding="utf-8"))
+                data["objects"] = max(0, data.get("objects", 0) + objects_delta)
+                data["bytes"] = max(0, data.get("bytes", 0) + bytes_delta)
+                data["version_count"] = max(0, data.get("version_count", 0) + version_count_delta)
+                data["version_bytes"] = max(0, data.get("version_bytes", 0) + version_bytes_delta)
+                data["total_objects"] = max(0, data.get("total_objects", 0) + objects_delta + version_count_delta)
+                data["total_bytes"] = max(0, data.get("total_bytes", 0) + bytes_delta + version_bytes_delta)
+                cache_path.write_text(json.dumps(data), encoding="utf-8")
+        except (OSError, json.JSONDecodeError):
+            pass
+
     def delete_bucket(self, bucket_name: str) -> None:
         bucket_path = self._bucket_path(bucket_name)
         if not bucket_path.exists():
@@ -333,22 +372,35 @@ class ObjectStorage:
         Returns:
             ListObjectsResult with objects, truncation status, and continuation token
         """
+        import bisect
+
         bucket_path = self._bucket_path(bucket_name)
         if not bucket_path.exists():
             raise BucketNotFoundError("Bucket does not exist")
         bucket_id = bucket_path.name
 
         object_cache = self._get_object_cache(bucket_id, bucket_path)
-        
+
-        all_keys = sorted(object_cache.keys())
+        cache_version = self._cache_version.get(bucket_id, 0)
-        
+        cached_entry = self._sorted_key_cache.get(bucket_id)
+        if cached_entry and cached_entry[1] == cache_version:
+            all_keys = cached_entry[0]
+        else:
+            all_keys = sorted(object_cache.keys())
+            self._sorted_key_cache[bucket_id] = (all_keys, cache_version)
+
         if prefix:
-            all_keys = [k for k in all_keys if k.startswith(prefix)]
+            lo = bisect.bisect_left(all_keys, prefix)
-        
+            hi = len(all_keys)
+            for i in range(lo, len(all_keys)):
+                if not all_keys[i].startswith(prefix):
+                    hi = i
+                    break
+            all_keys = all_keys[lo:hi]
+
         total_count = len(all_keys)
         start_index = 0
         if continuation_token:
-            import bisect
             start_index = bisect.bisect_right(all_keys, continuation_token)
             if start_index >= total_count:
                 return ListObjectsResult(
@@ -356,8 +408,8 @@ class ObjectStorage:
                     is_truncated=False,
                     next_continuation_token=None,
                     total_count=total_count,
-                )  
+                )
-        
+
         end_index = start_index + max_keys
         keys_slice = all_keys[start_index:end_index]
         is_truncated = end_index < total_count
@@ -403,7 +455,9 @@ class ObjectStorage:
         is_overwrite = destination.exists()
         existing_size = destination.stat().st_size if is_overwrite else 0
 
+        archived_version_size = 0
         if self._is_versioning_enabled(bucket_path) and is_overwrite:
+            archived_version_size = existing_size
             self._archive_current_version(bucket_id, safe_key, reason="overwrite")
 
         tmp_dir = self._system_root_path() / self.SYSTEM_TMP_DIR
@@ -416,11 +470,10 @@ class ObjectStorage:
                 shutil.copyfileobj(_HashingReader(stream, checksum), target)
             
             new_size = tmp_path.stat().st_size
-            
+            size_delta = new_size - existing_size
+            object_delta = 0 if is_overwrite else 1
+
             if enforce_quota:
-                size_delta = new_size - existing_size
-                object_delta = 0 if is_overwrite else 1
-                
                 quota_check = self.check_quota(
                     bucket_name,
                     additional_bytes=max(0, size_delta),
@@ -432,7 +485,7 @@ class ObjectStorage:
                         quota_check["quota"],
                         quota_check["usage"],
                     )
-            
+
             shutil.move(str(tmp_path), str(destination))
             
         finally:
@@ -448,7 +501,13 @@ class ObjectStorage:
         combined_meta = {**internal_meta, **(metadata or {})}
         self._write_metadata(bucket_id, safe_key, combined_meta)
 
-        self._invalidate_bucket_stats_cache(bucket_id)
+        self._update_bucket_stats_cache(
+            bucket_id,
+            bytes_delta=size_delta,
+            objects_delta=object_delta,
+            version_bytes_delta=archived_version_size,
+            version_count_delta=1 if archived_version_size > 0 else 0,
+        )
 
         obj_meta = ObjectMeta(
             key=safe_key.as_posix(),
@@ -498,15 +557,24 @@ class ObjectStorage:
         path = self._object_path(bucket_name, object_key)
         if not path.exists():
             return
+        deleted_size = path.stat().st_size
         safe_key = path.relative_to(bucket_path)
         bucket_id = bucket_path.name
+        archived_version_size = 0
         if self._is_versioning_enabled(bucket_path):
+            archived_version_size = deleted_size
             self._archive_current_version(bucket_id, safe_key, reason="delete")
         rel = path.relative_to(bucket_path)
         self._safe_unlink(path)
         self._delete_metadata(bucket_id, rel)
 
-        self._invalidate_bucket_stats_cache(bucket_id)
+        self._update_bucket_stats_cache(
+            bucket_id,
+            bytes_delta=-deleted_size,
+            objects_delta=-1,
+            version_bytes_delta=archived_version_size,
+            version_count_delta=1 if archived_version_size > 0 else 0,
+        )
         self._update_object_cache_entry(bucket_id, safe_key.as_posix(), None)
         self._cleanup_empty_parents(path, bucket_path)
 
@@ -828,7 +896,12 @@ class ObjectStorage:
         if not isinstance(metadata, dict):
             metadata = {}
         destination = bucket_path / safe_key
-        if self._is_versioning_enabled(bucket_path) and destination.exists():
+        restored_size = data_path.stat().st_size
+        is_overwrite = destination.exists()
+        existing_size = destination.stat().st_size if is_overwrite else 0
+        archived_version_size = 0
+        if self._is_versioning_enabled(bucket_path) and is_overwrite:
+            archived_version_size = existing_size
             self._archive_current_version(bucket_id, safe_key, reason="restore-overwrite")
         destination.parent.mkdir(parents=True, exist_ok=True)
         shutil.copy2(data_path, destination)
@@ -837,7 +910,13 @@ class ObjectStorage:
         else:
             self._delete_metadata(bucket_id, safe_key)
         stat = destination.stat()
-        self._invalidate_bucket_stats_cache(bucket_id)
+        self._update_bucket_stats_cache(
+            bucket_id,
+            bytes_delta=restored_size - existing_size,
+            objects_delta=0 if is_overwrite else 1,
+            version_bytes_delta=archived_version_size,
+            version_count_delta=1 if archived_version_size > 0 else 0,
+        )
         return ObjectMeta(
             key=safe_key.as_posix(),
             size=stat.st_size,
@@ -861,6 +940,7 @@ class ObjectStorage:
             meta_path = legacy_version_dir / f"{version_id}.json"
         if not data_path.exists() and not meta_path.exists():
             raise StorageError(f"Version {version_id} not found")
+        deleted_version_size = data_path.stat().st_size if data_path.exists() else 0
         if data_path.exists():
             data_path.unlink()
         if meta_path.exists():
@@ -868,6 +948,12 @@ class ObjectStorage:
         parent = data_path.parent
         if parent.exists() and not any(parent.iterdir()):
             parent.rmdir()
+        if deleted_version_size > 0:
+            self._update_bucket_stats_cache(
+                bucket_id,
+                version_bytes_delta=-deleted_version_size,
+                version_count_delta=-1,
+            )
 
     def list_orphaned_objects(self, bucket_name: str) -> List[Dict[str, Any]]:
         bucket_path = self._bucket_path(bucket_name)
@@ -1164,14 +1250,14 @@ class ObjectStorage:
 
         safe_key = self._sanitize_object_key(manifest["object_key"], self._object_key_max_length_bytes)
         destination = bucket_path / safe_key
-        
+
         is_overwrite = destination.exists()
         existing_size = destination.stat().st_size if is_overwrite else 0
-        
+        size_delta = total_size - existing_size
+        object_delta = 0 if is_overwrite else 1
+        versioning_enabled = self._is_versioning_enabled(bucket_path)
+
         if enforce_quota:
-            size_delta = total_size - existing_size
-            object_delta = 0 if is_overwrite else 1
-            
             quota_check = self.check_quota(
                 bucket_name,
                 additional_bytes=max(0, size_delta),
@@ -1183,14 +1269,16 @@ class ObjectStorage:
                     quota_check["quota"],
                     quota_check["usage"],
                 )
-        
+
         destination.parent.mkdir(parents=True, exist_ok=True)
 
         lock_file_path = self._system_bucket_root(bucket_id) / "locks" / f"{safe_key.as_posix().replace('/', '_')}.lock"
 
+        archived_version_size = 0
         try:
             with _atomic_lock_file(lock_file_path):
-                if self._is_versioning_enabled(bucket_path) and destination.exists():
+                if versioning_enabled and destination.exists():
+                    archived_version_size = destination.stat().st_size
                     self._archive_current_version(bucket_id, safe_key, reason="overwrite")
                 checksum = hashlib.md5()
                 with destination.open("wb") as target:
@@ -1210,7 +1298,13 @@ class ObjectStorage:
 
         shutil.rmtree(upload_root, ignore_errors=True)
 
-        self._invalidate_bucket_stats_cache(bucket_id)
+        self._update_bucket_stats_cache(
+            bucket_id,
+            bytes_delta=size_delta,
+            objects_delta=object_delta,
+            version_bytes_delta=archived_version_size,
+            version_count_delta=1 if archived_version_size > 0 else 0,
+        )
 
         stat = destination.stat()
         etag = checksum.hexdigest()
@@ -1586,6 +1680,8 @@ class ObjectStorage:
                     objects.pop(key, None)
                 else:
                     objects[key] = meta
+            self._cache_version[bucket_id] = self._cache_version.get(bucket_id, 0) + 1
+            self._sorted_key_cache.pop(bucket_id, None)
 
     def warm_cache(self, bucket_names: Optional[List[str]] = None) -> None:
         """Pre-warm the object cache for specified buckets or all buckets.

app/ui.py

@@ -220,13 +220,16 @@ def _bucket_access_descriptor(policy: dict[str, Any] | None) -> tuple[str, str]:
 
 
 def _current_principal():
-    creds = session.get("credentials")
+    token = session.get("cred_token")
+    creds = _secret_store().peek(token) if token else None
     if not creds:
         return None
     try:
         return _iam().authenticate(creds["access_key"], creds["secret_key"])
     except IamError:
-        session.pop("credentials", None)
+        session.pop("cred_token", None)
+        if token:
+            _secret_store().pop(token)
         return None
 
 
@@ -251,7 +254,8 @@ def _authorize_ui(principal, bucket_name: str | None, action: str, *, object_key
 
 
 def _api_headers() -> dict[str, str]:
-    creds = session.get("credentials") or {}
+    token = session.get("cred_token")
+    creds = _secret_store().peek(token) or {}
     return {
         "X-Access-Key": creds.get("access_key", ""),
         "X-Secret-Key": creds.get("secret_key", ""),
@@ -296,7 +300,9 @@ def login():
         except IamError as exc:
             flash(_friendly_error_message(exc), "danger")
             return render_template("login.html")
-        session["credentials"] = {"access_key": access_key, "secret_key": secret_key}
+        creds = {"access_key": access_key, "secret_key": secret_key}
+        token = _secret_store().remember(creds, ttl=3600)
+        session["cred_token"] = token
         session.permanent = True
         flash(f"Welcome back, {principal.display_name}", "success")
         return redirect(url_for("ui.buckets_overview"))
@@ -305,7 +311,9 @@ def login():
 
 @ui_bp.post("/logout")
 def logout():
-    session.pop("credentials", None)
+    token = session.pop("cred_token", None)
+    if token:
+        _secret_store().pop(token)
     flash("Signed out", "info")
     return redirect(url_for("ui.login"))
 
@@ -542,7 +550,10 @@ def list_bucket_objects(bucket_name: str):
     except IamError as exc:
         return jsonify({"error": str(exc)}), 403
 
-    max_keys = min(int(request.args.get("max_keys", 1000)), 100000)
+    try:
+        max_keys = min(int(request.args.get("max_keys", 1000)), 100000)
+    except ValueError:
+        return jsonify({"error": "max_keys must be an integer"}), 400
     continuation_token = request.args.get("continuation_token") or None
     prefix = request.args.get("prefix") or None
 

app/version.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-APP_VERSION = "0.2.5"
+APP_VERSION = "0.2.6"
 
 
 def get_version() -> str:

docs.md

@@ -619,13 +619,15 @@ MyFSIO implements a comprehensive Identity and Access Management (IAM) system th
 
 ### Getting Started
 
-1. On first boot, `data/.myfsio.sys/config/iam.json` is seeded with `localadmin / localadmin` that has wildcard access.
+1. On first boot, `data/.myfsio.sys/config/iam.json` is created with a randomly generated admin user. The access key and secret key are printed to the console during first startup. If you miss it, check the `iam.json` file directly—credentials are stored in plaintext.
-2. Sign into the UI using those credentials, then open **IAM**:
+2. Sign into the UI using the generated credentials, then open **IAM**:
    - **Create user**: supply a display name and optional JSON inline policy array.
    - **Rotate secret**: generates a new secret key; the UI surfaces it once.
    - **Policy editor**: select a user, paste an array of objects (`{"bucket": "*", "actions": ["list", "read"]}`), and submit. Alias support includes AWS-style verbs (e.g., `s3:GetObject`).
 3. Wildcard action `iam:*` is supported for admin user definitions.
 
+> **Breaking Change (v0.2.0+):** Previous versions used fixed default credentials (`localadmin/localadmin`). If upgrading from an older version, your existing credentials remain unchanged, but new installations will generate random credentials.
+
 ### Authentication
 
 The API expects every request to include authentication headers. The UI persists them in the Flask session after login.

templates/docs.html

@@ -451,10 +451,10 @@ sudo journalctl -u myfsio -f   # View logs</code></pre>
           <span class="docs-section-kicker">03</span>
           <h2 class="h4 mb-0">Authenticate &amp; manage IAM</h2>
         </div>
-        <p class="text-muted">MyFSIO seeds <code>data/.myfsio.sys/config/iam.json</code> with <code>localadmin/localadmin</code>. Sign in once, rotate it, then grant least-privilege access to teammates and tools.</p>
+        <p class="text-muted">On first startup, MyFSIO generates random admin credentials and prints them to the console. Missed it? Check <code>data/.myfsio.sys/config/iam.json</code> directly—credentials are stored in plaintext.</p>
         <div class="docs-highlight mb-3">
           <ol class="mb-0">
-            <li>Visit <code>/ui/login</code>, enter the bootstrap credentials, and rotate them immediately from the IAM page.</li>
+            <li>Check the console output (or <code>iam.json</code>) for the generated <code>Access Key</code> and <code>Secret Key</code>, then visit <code>/ui/login</code>.</li>
             <li>Create additional users with descriptive display names and AWS-style inline policies (for example <code>{"bucket": "*", "actions": ["list", "read"]}</code>).</li>
             <li>Rotate secrets when sharing with CI jobs—new secrets display once and persist to <code>data/.myfsio.sys/config/iam.json</code>.</li>
             <li>Bucket policies layer on top of IAM. Apply Private/Public presets or paste custom JSON; changes reload instantly.</li>
@@ -2136,8 +2136,8 @@ curl -X PUT "{{ api_base }}/&lt;bucket&gt;?tagging" \
             <code class="d-block">{{ api_base }}</code>
           </div>
           <div>
-            <div class="small text-uppercase text-muted">Sample user</div>
+            <div class="small text-uppercase text-muted">Initial credentials</div>
-            <code class="d-block">localadmin / localadmin</code>
+            <span class="text-muted small">Generated on first run (check console)</span>
           </div>
           <div>
             <div class="small text-uppercase text-muted">Logs</div>

templates/metrics.html

@@ -398,6 +398,14 @@
             <option value="24" selected>Last 24 hours</option>
             <option value="168">Last 7 days</option>
           </select>
+          <select class="form-select form-select-sm" id="maxDataPoints" style="width: auto;" title="Maximum data points to display">
+            <option value="100">100 points</option>
+            <option value="250">250 points</option>
+            <option value="500" selected>500 points</option>
+            <option value="1000">1000 points</option>
+            <option value="2000">2000 points</option>
+            <option value="0">Unlimited</option>
+          </select>
         </div>
       </div>
       <div class="card-body p-4">
@@ -817,8 +825,8 @@
   var diskChart = null;
   var historyStatus = document.getElementById('historyStatus');
   var timeRangeSelect = document.getElementById('historyTimeRange');
+  var maxDataPointsSelect = document.getElementById('maxDataPoints');
   var historyTimer = null;
-  var MAX_DATA_POINTS = 500;
 
   function createChart(ctx, label, color) {
     return new Chart(ctx, {
@@ -889,7 +897,8 @@
           if (historyStatus) historyStatus.textContent = 'No history data available yet. Data is recorded every ' + (data.interval_minutes || 5) + ' minutes.';
           return;
         }
-        var history = data.history.slice(-MAX_DATA_POINTS);
+        var maxPoints = maxDataPointsSelect ? parseInt(maxDataPointsSelect.value, 10) : 500;
+        var history = maxPoints > 0 ? data.history.slice(-maxPoints) : data.history;
         var labels = history.map(function(h) { return formatTime(h.timestamp); });
         var cpuData = history.map(function(h) { return h.cpu_percent; });
         var memData = history.map(function(h) { return h.memory_percent; });
@@ -927,6 +936,10 @@
     timeRangeSelect.addEventListener('change', loadHistory);
   }
 
+  if (maxDataPointsSelect) {
+    maxDataPointsSelect.addEventListener('change', loadHistory);
+  }
+
   document.addEventListener('visibilitychange', function() {
     if (document.hidden) {
       if (historyTimer) clearInterval(historyTimer);