diff --git a/RuffiansMaintenance.ipynb b/RuffiansMaintenance.ipynb
new file mode 100644
index 0000000..cc91ef9
--- /dev/null
+++ b/RuffiansMaintenance.ipynb
@@ -0,0 +1,124 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "0f39a5b4",
+   "metadata": {},
+   "source": [
+    "# Hololive"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "c53648c3",
+   "metadata": {
+    "vscode": {
+     "languageId": "polyglot-notebook"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "#!pwsh\n",
+    "$BaseUrl = \"http://10.16.1.100:8016/odata/HololiveSchedule\"\n",
+    "$TimeoutSec = 10\n",
+    "$ArchiveDir = \"/mnt/hdd/hololive-archive\"\n",
+    "\n",
+    "try {\n",
+    "    $JstTz = [TimeZoneInfo]::FindSystemTimeZoneById(\"Tokyo Standard Time\")\n",
+    "} catch {\n",
+    "    $JstTz = [TimeZoneInfo]::FindSystemTimeZoneById(\"Asia/Tokyo\")\n",
+    "}\n",
+    "\n",
+    "$nowJst = [TimeZoneInfo]::ConvertTime([DateTimeOffset]::Now, $JstTz)\n",
+    "$today = $nowJst.Date\n",
+    "$yesterdayEndLocal = $today.AddDays(-1).AddHours(23).AddMinutes(59).AddSeconds(59)\n",
+    "$yesterdayEnd = [DateTimeOffset]::new($yesterdayEndLocal, $JstTz.GetUtcOffset($yesterdayEndLocal))\n",
+    "\n",
+    "$params = @{\n",
+    "    '$filter' = \"StartDt le $($yesterdayEnd.ToString('o'))\"\n",
+    "    '$select' = \"Id,StartDt,MemberName,StreamUrl,StreamTitle,StreamImage,Md5\"\n",
+    "}\n",
+    "\n",
+    "function Get-QueryString($p) {\n",
+    "    if (-not $p) { return \"\" }\n",
+    "    ($p.GetEnumerator() | ForEach-Object {\n",
+    "        \"{0}={1}\" -f [uri]::EscapeDataString($_.Key), [uri]::EscapeDataString($_.Value)\n",
+    "    }) -join \"&\"\n",
+    "}\n",
+    "\n",
+    "$rows = @()\n",
+    "$url = $BaseUrl\n",
+    "\n",
+    "while ($true) {\n",
+    "    $reqUrl = $url\n",
+    "    $qs = Get-QueryString $params\n",
+    "    if ($qs) {\n",
+    "        $reqUrl = \"$url`?$qs\"\n",
+    "    }\n",
+    "\n",
+    "    $data = Invoke-RestMethod -Uri $reqUrl -Method Get -TimeoutSec $TimeoutSec\n",
+    "    if ($null -ne $data.value) {\n",
+    "        $rows += $data.value\n",
+    "    }\n",
+    "    $url = $data.'@odata.nextLink'\n",
+    "    $params = $null\n",
+    "    if (-not $url) { break }\n",
+    "}\n",
+    "\n",
+    "if (-not $rows -or $rows.Count -eq 0) {\n",
+    "    Write-Host \"没找到需要归档的数据\"\n",
+    "} else {\n",
+    "    $byMonth = @{}\n",
+    "    foreach ($r in $rows) {\n",
+    "        $dtObj = [TimeZoneInfo]::ConvertTime([DateTimeOffset]::Parse($r.StartDt), $JstTz)\n",
+    "        $ym = $dtObj.ToString(\"yyyy-MM\")\n",
+    "        if (-not $byMonth.ContainsKey($ym)) { $byMonth[$ym] = @() }\n",
+    "        $byMonth[$ym] += $r\n",
+    "    }\n",
+    "\n",
+    "    foreach ($ym in $byMonth.Keys) {\n",
+    "        $items = $byMonth[$ym]\n",
+    "        $path = Join-Path $ArchiveDir \"$ym.csv\"\n",
+    "\n",
+    "        $existing = @{}\n",
+    "        if (Test-Path $path) {\n",
+    "            Import-Csv -Path $path | ForEach-Object {\n",
+    "                $existing[$_.Md5] = $_\n",
+    "            }\n",
+    "        }\n",
+    "\n",
+    "        foreach ($r in $items) {\n",
+    "            $existing[$r.Md5] = [pscustomobject]@{\n",
+    "                StartDt = $r.StartDt\n",
+    "                MemberName = $r.MemberName\n",
+    "                StreamUrl = $r.StreamUrl\n",
+    "                StreamTitle = $r.StreamTitle\n",
+    "                StreamImage = $(if ($null -eq $r.StreamImage) { \"\" } else { $r.StreamImage })\n",
+    "                Md5 = $r.Md5\n",
+    "            }\n",
+    "        }\n",
+    "\n",
+    "        $existing.Values | Sort-Object StartDt | Export-Csv -Path $path -NoTypeInformation -Encoding UTF8\n",
+    "        Write-Host \"ARCHIVED $ym.csv : $($items.Count) 条\"\n",
+    "    }\n",
+    "\n",
+    "    foreach ($r in $rows) {\n",
+    "        $deleteUrl = \"$BaseUrl($($r.Id))\"\n",
+    "        Invoke-RestMethod -Uri $deleteUrl -Method Delete -TimeoutSec $TimeoutSec | Out-Null\n",
+    "        Write-Host \"DELETE $($r.StartDt) | $($r.StreamTitle)\"\n",
+    "    }\n",
+    "\n",
+    "    Write-Host \"完成，归档并删除 $($rows.Count) 条\"\n",
+    "}\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "csharp"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}