diff --git a/.gitignore b/.gitignore
index 5ef6a52..b1a4d73 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,6 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# alert persistence
+/data/alerts.json
diff --git a/package-lock.json b/package-lock.json
index 416649a..597e581 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
-  "name": "oversnitch-tmp",
+  "name": "oversnitch",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "oversnitch-tmp",
+      "name": "oversnitch",
       "version": "0.1.0",
       "dependencies": {
         "next": "16.2.3",
diff --git a/package.json b/package.json
index 09307d1..95a37ae 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "oversnitch-tmp",
+  "name": "oversnitch",
   "version": "0.1.0",
   "private": true,
   "scripts": {
diff --git a/src/app/alerts/[id]/AlertDetail.tsx b/src/app/alerts/[id]/AlertDetail.tsx
new file mode 100644
index 0000000..6437e0b
--- /dev/null
+++ b/src/app/alerts/[id]/AlertDetail.tsx
@@ -0,0 +1,170 @@
+"use client";
+
+import { useState } from "react";
+import Link from "next/link";
+import { Alert, AlertSeverity } from "@/lib/types";
+
+const severityAccent: Record<AlertSeverity, string> = {
+  danger: "border-l-red-500",
+  warning: "border-l-yellow-500",
+  info: "border-l-blue-500",
+};
+
+function timeAgo(iso: string): string {
+  const diff = Date.now() - new Date(iso).getTime();
+  const mins = Math.floor(diff / 60_000);
+  if (mins < 1) return "just now";
+  if (mins < 60) return `${mins}m ago`;
+  const hrs = Math.floor(mins / 60);
+  if (hrs < 24) return `${hrs}h ago`;
+  return `${Math.floor(hrs / 24)}d ago`;
+}
+
+function shortDate(iso: string): string {
+  return new Date(iso).toLocaleDateString(undefined, {
+    month: "short", day: "numeric", hour: "numeric", minute: "2-digit",
+  });
+}
+
+export default function AlertDetail({ initialAlert }: { initialAlert: Alert }) {
+  const [alert, setAlert] = useState<Alert>(initialAlert);
+  const [actionLoading, setActionLoading] = useState(false);
+  const [commentText, setCommentText] = useState("");
+  const [commentLoading, setCommentLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function toggleStatus() {
+    setActionLoading(true);
+    setError(null);
+    try {
+      const newStatus = alert.status === "open" ? "closed" : "open";
+      const res = await fetch(`/api/alerts/${alert.id}`, {
+        method: "PATCH",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ status: newStatus }),
+      });
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      setAlert(await res.json());
+    } catch (e) {
+      setError(e instanceof Error ? e.message : String(e));
+    } finally {
+      setActionLoading(false);
+    }
+  }
+
+  async function submitComment(e: React.FormEvent) {
+    e.preventDefault();
+    if (!commentText.trim()) return;
+    setCommentLoading(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/alerts/${alert.id}/comments`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ body: commentText.trim() }),
+      });
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      const comment = await res.json();
+      setAlert((prev) => ({ ...prev, comments: [...prev.comments, comment] }));
+      setCommentText("");
+    } catch (e) {
+      setError(e instanceof Error ? e.message : String(e));
+    } finally {
+      setCommentLoading(false);
+    }
+  }
+
+  const isOpen = alert.status === "open";
+  const isResolved = alert.closeReason === "resolved";
+  const statusTime = isOpen ? alert.firstSeen : (alert.closedAt ?? alert.firstSeen);
+
+  return (
+    <main className="mx-auto max-w-2xl px-4 py-8 space-y-5">
+
+      <Link
+        href="/?tab=alerts"
+        className="inline-flex items-center gap-1.5 text-sm text-slate-500 hover:text-slate-300 transition-colors"
+      >
+        <svg className="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={2}>
+          <path strokeLinecap="round" strokeLinejoin="round" d="M15 19l-7-7 7-7" />
+        </svg>
+        All Alerts
+      </Link>
+
+      {error && (
+        <div className="rounded-lg border border-red-800 bg-red-950/30 px-4 py-3 text-red-300 text-sm">
+          {error}
+        </div>
+      )}
+
+      {/* Alert card */}
+      <div className={`rounded-xl bg-slate-800/40 border border-slate-700/60 border-l-4 px-6 py-5 space-y-3 ${severityAccent[alert.severity]}`}>
+
+        {/* Status row */}
+        <div className="flex items-center justify-between gap-3">
+          <span className={`inline-flex items-center gap-1.5 text-xs font-semibold ${
+            isOpen ? "text-green-400" : isResolved ? "text-teal-400" : "text-slate-500"
+          }`}>
+            {isOpen && <span className="h-1.5 w-1.5 rounded-full bg-green-400 shrink-0" />}
+            {isOpen ? "Open" : isResolved ? "Auto-resolved" : "Closed"}
+            <span className="text-slate-700 font-normal">·</span>
+            <span className="text-slate-600 font-normal">{timeAgo(statusTime)}</span>
+          </span>
+
+          <button
+            onClick={toggleStatus}
+            disabled={actionLoading}
+            className={`rounded-lg px-4 py-1.5 text-xs font-semibold transition-colors disabled:opacity-40 disabled:cursor-not-allowed ${
+              isOpen
+                ? "bg-slate-700 hover:bg-slate-600 text-white"
+                : "bg-green-900/50 hover:bg-green-800/50 text-green-300 border border-green-800"
+            }`}
+          >
+            {actionLoading ? "…" : isOpen ? "Close" : "Reopen"}
+          </button>
+        </div>
+
+        {/* Title + description */}
+        <div className="space-y-1.5">
+          <h1 className="text-lg font-bold text-white leading-snug">{alert.title}</h1>
+          <p className="text-sm text-slate-400 leading-relaxed">{alert.description}</p>
+        </div>
+      </div>
+
+      {/* Notes */}
+      <section className="space-y-3 pt-1">
+        <h2 className="text-xs font-semibold uppercase tracking-widest text-slate-600">Notes</h2>
+
+        {alert.comments.length === 0 && (
+          <p className="text-sm text-slate-700">No notes yet.</p>
+        )}
+
+        {alert.comments.map((c) => (
+          <div key={c.id} className="space-y-1">
+            <p className="text-xs text-slate-600">{shortDate(c.createdAt)}</p>
+            <p className="text-sm text-slate-300 whitespace-pre-wrap leading-relaxed">{c.body}</p>
+          </div>
+        ))}
+
+        <form onSubmit={submitComment} className="flex flex-col gap-2 pt-1">
+          <textarea
+            value={commentText}
+            onChange={(e) => setCommentText(e.target.value)}
+            placeholder="Add a note…"
+            rows={3}
+            className="w-full rounded-lg bg-slate-800/40 border border-slate-700/60 focus:border-slate-500 text-sm text-white placeholder-slate-700 px-4 py-3 focus:outline-none resize-none transition-colors"
+          />
+          <div className="flex justify-end">
+            <button
+              type="submit"
+              disabled={commentLoading || !commentText.trim()}
+              className="rounded-lg bg-slate-700 hover:bg-slate-600 disabled:opacity-40 disabled:cursor-not-allowed px-4 py-2 text-sm font-medium text-white transition-colors"
+            >
+              {commentLoading ? "Saving…" : "Save"}
+            </button>
+          </div>
+        </form>
+      </section>
+    </main>
+  );
+}
diff --git a/src/app/alerts/[id]/page.tsx b/src/app/alerts/[id]/page.tsx
new file mode 100644
index 0000000..ac496d5
--- /dev/null
+++ b/src/app/alerts/[id]/page.tsx
@@ -0,0 +1,14 @@
+import { getAlertById } from "@/lib/db";
+import { notFound } from "next/navigation";
+import AlertDetail from "./AlertDetail";
+
+export default async function AlertPage({
+  params,
+}: {
+  params: Promise<{ id: string }>;
+}) {
+  const { id } = await params;
+  const alert = getAlertById(Number(id));
+  if (!alert) notFound();
+  return <AlertDetail initialAlert={alert} />;
+}
diff --git a/src/app/api/alerts/[id]/comments/route.ts b/src/app/api/alerts/[id]/comments/route.ts
new file mode 100644
index 0000000..ef48cce
--- /dev/null
+++ b/src/app/api/alerts/[id]/comments/route.ts
@@ -0,0 +1,26 @@
+import { addComment } from "@/lib/db";
+
+export async function POST(
+  req: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params;
+
+  let body: { body: string };
+  try {
+    body = await req.json();
+  } catch {
+    return Response.json({ error: "Invalid JSON" }, { status: 400 });
+  }
+
+  if (!body.body?.trim()) {
+    return Response.json({ error: "Comment body is required" }, { status: 400 });
+  }
+
+  const comment = addComment(Number(id), body.body.trim());
+  if (!comment) {
+    return Response.json({ error: "Alert not found" }, { status: 404 });
+  }
+
+  return Response.json(comment, { status: 201 });
+}
diff --git a/src/app/api/alerts/[id]/route.ts b/src/app/api/alerts/[id]/route.ts
new file mode 100644
index 0000000..eceab74
--- /dev/null
+++ b/src/app/api/alerts/[id]/route.ts
@@ -0,0 +1,42 @@
+import { getAlertById, closeAlert, reopenAlert } from "@/lib/db";
+
+export async function GET(
+  _req: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params;
+  const alert = getAlertById(Number(id));
+  if (!alert) {
+    return Response.json({ error: "Alert not found" }, { status: 404 });
+  }
+  return Response.json(alert);
+}
+
+export async function PATCH(
+  req: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params;
+  const numId = Number(id);
+
+  let body: { status: string };
+  try {
+    body = await req.json();
+  } catch {
+    return Response.json({ error: "Invalid JSON" }, { status: 400 });
+  }
+
+  if (body.status === "closed") {
+    const updated = closeAlert(numId);
+    if (!updated) return Response.json({ error: "Alert not found" }, { status: 404 });
+    return Response.json(updated);
+  }
+
+  if (body.status === "open") {
+    const updated = reopenAlert(numId);
+    if (!updated) return Response.json({ error: "Alert not found" }, { status: 404 });
+    return Response.json(updated);
+  }
+
+  return Response.json({ error: "status must be 'open' or 'closed'" }, { status: 400 });
+}
diff --git a/src/app/api/alerts/route.ts b/src/app/api/alerts/route.ts
new file mode 100644
index 0000000..f567489
--- /dev/null
+++ b/src/app/api/alerts/route.ts
@@ -0,0 +1,11 @@
+import { getAllAlerts } from "@/lib/db";
+
+export async function GET() {
+  try {
+    const alerts = getAllAlerts();
+    return Response.json(alerts);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return Response.json({ error: message }, { status: 500 });
+  }
+}
diff --git a/src/app/api/stats/route.ts b/src/app/api/stats/route.ts
new file mode 100644
index 0000000..e93206e
--- /dev/null
+++ b/src/app/api/stats/route.ts
@@ -0,0 +1,65 @@
+import { buildRadarrMap } from "@/lib/radarr";
+import { buildSonarrMap } from "@/lib/sonarr";
+import { fetchAllUsers, fetchUserRequests } from "@/lib/overseerr";
+import { buildTautulliMap } from "@/lib/tautulli";
+import { computeStats } from "@/lib/aggregate";
+import { DashboardStats, OverseerrRequest } from "@/lib/types";
+
+const BATCH_SIZE = 5;
+
+// ── Server-side SWR cache ────────────────────────────────────────────────────
+// Persists in the Node.js process between requests.
+// Background-refreshes after STALE_MS so reads always return instantly.
+
+const STALE_MS = 5 * 60 * 1000; // start background refresh after 5 min
+let cache: { stats: DashboardStats; at: number } | null = null;
+let refreshing = false;
+
+async function buildStats(): Promise<DashboardStats> {
+  const [radarrMap, sonarrMap, users, tautulliMap] = await Promise.all([
+    buildRadarrMap(),
+    buildSonarrMap(),
+    fetchAllUsers(),
+    buildTautulliMap(),
+  ]);
+
+  const allRequests = new Map<number, OverseerrRequest[]>();
+
+  for (let i = 0; i < users.length; i += BATCH_SIZE) {
+    const chunk = users.slice(i, i + BATCH_SIZE);
+    const results = await Promise.all(
+      chunk.map((u) => fetchUserRequests(u.id))
+    );
+    chunk.forEach((u, idx) => allRequests.set(u.id, results[idx]));
+  }
+
+  return computeStats(users, allRequests, radarrMap, sonarrMap, tautulliMap);
+}
+
+export async function GET(req: Request) {
+  const force = new URL(req.url).searchParams.has("force");
+
+  try {
+    // Force (Refresh button) or cold start: wait for fresh data
+    if (force || !cache) {
+      const stats = await buildStats();
+      cache = { stats, at: Date.now() };
+      return Response.json(cache.stats);
+    }
+
+    // Stale: kick off background refresh, return cache immediately
+    const age = Date.now() - cache.at;
+    if (age > STALE_MS && !refreshing) {
+      refreshing = true;
+      buildStats()
+        .then((stats) => { cache = { stats, at: Date.now() }; })
+        .catch(() => {})
+        .finally(() => { refreshing = false; });
+    }
+
+    return Response.json(cache.stats);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return Response.json({ error: message }, { status: 500 });
+  }
+}
diff --git a/src/app/globals.css b/src/app/globals.css
index a2dc41e..8809f36 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -1,26 +1,7 @@
 @import "tailwindcss";
 
-:root {
-  --background: #ffffff;
-  --foreground: #171717;
-}
-
-@theme inline {
-  --color-background: var(--background);
-  --color-foreground: var(--foreground);
-  --font-sans: var(--font-geist-sans);
-  --font-mono: var(--font-geist-mono);
-}
-
-@media (prefers-color-scheme: dark) {
-  :root {
-    --background: #0a0a0a;
-    --foreground: #ededed;
-  }
-}
-
 body {
-  background: var(--background);
-  color: var(--foreground);
-  font-family: Arial, Helvetica, sans-serif;
+  background: #020617; /* slate-950 */
+  color: #f8fafc;
+  font-family: var(--font-geist-sans), Arial, Helvetica, sans-serif;
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 976eb90..9975843 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -13,8 +13,8 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
-  description: "Generated by create next app",
+  title: "OverSnitch",
+  description: "Overseerr user request analytics",
 };
 
 export default function RootLayout({
@@ -27,7 +27,7 @@ export default function RootLayout({
       lang="en"
       className={`${geistSans.variable} ${geistMono.variable} h-full antialiased`}
     >
-      <body className="min-h-full flex flex-col">{children}</body>
+      <body className="min-h-full bg-slate-950 text-white">{children}</body>
     </html>
   );
 }
diff --git a/src/app/page.tsx b/src/app/page.tsx
index 3f36f7c..4a28bf4 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -1,65 +1,188 @@
-import Image from "next/image";
+"use client";
+
+import { useEffect, useState, useCallback, useRef, Suspense } from "react";
+import { useSearchParams, useRouter } from "next/navigation";
+import { DashboardStats } from "@/lib/types";
+import SummaryCards from "@/components/SummaryCards";
+import LeaderboardTable from "@/components/LeaderboardTable";
+import AlertsPanel from "@/components/AlertsPanel";
+import RefreshButton from "@/components/RefreshButton";
+
+type Tab = "leaderboard" | "alerts";
+const LS_KEY = "oversnitch_stats";
+
+function timeAgo(iso: string): string {
+  const diff = Date.now() - new Date(iso).getTime();
+  const mins = Math.floor(diff / 60_000);
+  if (mins < 1) return "just now";
+  if (mins < 60) return `${mins}m ago`;
+  const hrs = Math.floor(mins / 60);
+  if (hrs < 24) return `${hrs}h ago`;
+  return new Date(iso).toLocaleDateString();
+}
+
+function DashboardContent() {
+  const searchParams = useSearchParams();
+  const router = useRouter();
+  const tab = (searchParams.get("tab") ?? "leaderboard") as Tab;
+
+  const [data, setData] = useState<DashboardStats | null>(null);
+  const [loading, setLoading] = useState(false);
+  const [refreshing, setRefreshing] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const didInit = useRef(false);
+
+  const load = useCallback(async (force = false) => {
+    setData((prev) => {
+      if (prev) setRefreshing(true);
+      else setLoading(true);
+      return prev;
+    });
+    setError(null);
+
+    try {
+      const res = await fetch(force ? "/api/stats?force=1" : "/api/stats");
+      const json = await res.json();
+      if (!res.ok) throw new Error(json.error ?? `HTTP ${res.status}`);
+      const stats = json as DashboardStats;
+      setData(stats);
+      try { localStorage.setItem(LS_KEY, JSON.stringify(stats)); } catch {}
+    } catch (e) {
+      setError(e instanceof Error ? e.message : String(e));
+    } finally {
+      setLoading(false);
+      setRefreshing(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    if (didInit.current) return;
+    didInit.current = true;
+
+    try {
+      const raw = localStorage.getItem(LS_KEY);
+      if (raw) setData(JSON.parse(raw) as DashboardStats);
+    } catch {}
+
+    load();
+  }, [load]);
+
+  function setTab(t: Tab) {
+    const params = new URLSearchParams(searchParams.toString());
+    params.set("tab", t);
+    router.push(`?${params.toString()}`, { scroll: false });
+  }
+
+  const hasTautulli = data?.summary.totalWatchHours !== null;
+  const openAlertCount = data?.summary.openAlertCount ?? 0;
+  const generatedAt = data?.generatedAt ?? null;
 
-export default function Home() {
   return (
-    <div className="flex flex-col flex-1 items-center justify-center bg-zinc-50 font-sans dark:bg-black">
-      <main className="flex flex-1 w-full max-w-3xl flex-col items-center justify-between py-32 px-16 bg-white dark:bg-black sm:items-start">
-        <Image
-          className="dark:invert"
-          src="/next.svg"
-          alt="Next.js logo"
-          width={100}
-          height={20}
-          priority
-        />
-        <div className="flex flex-col items-center gap-6 text-center sm:items-start sm:text-left">
-          <h1 className="max-w-xs text-3xl font-semibold leading-10 tracking-tight text-black dark:text-zinc-50">
-            To get started, edit the page.tsx file.
+    <main className="mx-auto max-w-6xl px-4 py-8 space-y-6">
+      {/* Header */}
+      <div className="flex items-start justify-between gap-4">
+        <div>
+          <h1 className="text-3xl font-bold tracking-tight">
+            Over<span className="text-yellow-400">Snitch</span>
           </h1>
-          <p className="max-w-md text-lg leading-8 text-zinc-600 dark:text-zinc-400">
-            Looking for a starting point or more instructions? Head over to{" "}
-            <a
-              href="https://vercel.com/templates?framework=next.js&utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              className="font-medium text-zinc-950 dark:text-zinc-50"
-            >
-              Templates
-            </a>{" "}
-            or the{" "}
-            <a
-              href="https://nextjs.org/learn?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              className="font-medium text-zinc-950 dark:text-zinc-50"
-            >
-              Learning
-            </a>{" "}
-            center.
-          </p>
+          <p className="text-slate-400 text-sm mt-1.5">Request &amp; usage analytics</p>
         </div>
-        <div className="flex flex-col gap-4 text-base font-medium sm:flex-row">
-          <a
-            className="flex h-12 w-full items-center justify-center gap-2 rounded-full bg-foreground px-5 text-background transition-colors hover:bg-[#383838] dark:hover:bg-[#ccc] md:w-[158px]"
-            href="https://vercel.com/new?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            <Image
-              className="dark:invert"
-              src="/vercel.svg"
-              alt="Vercel logomark"
-              width={16}
-              height={16}
-            />
-            Deploy Now
-          </a>
-          <a
-            className="flex h-12 w-full items-center justify-center rounded-full border border-solid border-black/[.08] px-5 transition-colors hover:border-transparent hover:bg-black/[.04] dark:border-white/[.145] dark:hover:bg-[#1a1a1a] md:w-[158px]"
-            href="https://nextjs.org/docs?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            Documentation
-          </a>
+
+        <div className="flex flex-col items-end gap-1.5 shrink-0">
+          <RefreshButton onRefresh={() => load(true)} loading={refreshing || loading} />
+          {generatedAt && (
+            <span className="text-xs text-slate-600">
+              {refreshing
+                ? <span className="text-yellow-600/80">Refreshing…</span>
+                : <>Updated {timeAgo(generatedAt)}</>
+              }
+            </span>
+          )}
         </div>
-      </main>
-    </div>
+      </div>
+
+      {/* First-ever load spinner */}
+      {loading && !data && (
+        <div className="flex flex-col items-center justify-center py-24 gap-4">
+          <svg
+            className="animate-spin h-8 w-8 text-yellow-400"
+            xmlns="http://www.w3.org/2000/svg"
+            fill="none"
+            viewBox="0 0 24 24"
+          >
+            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
+            <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8v8H4z" />
+          </svg>
+          <div className="text-center space-y-1">
+            <p className="text-slate-300 text-sm font-medium">Fetching data…</p>
+            <p className="text-slate-600 text-xs">This only takes a moment on first load.</p>
+          </div>
+        </div>
+      )}
+
+      {/* Error */}
+      {error && (
+        <div className="rounded-xl border border-red-800 bg-red-950/40 px-5 py-4 text-sm">
+          <span className="font-semibold text-red-400">Error: </span>
+          <span className="text-red-300">{error}</span>
+        </div>
+      )}
+
+      {data && (
+        <>
+          <SummaryCards
+            totalUsers={data.summary.totalUsers}
+            totalRequests={data.summary.totalRequests}
+            totalStorageGB={data.summary.totalStorageGB}
+            totalWatchHours={data.summary.totalWatchHours}
+            openAlertCount={data.summary.openAlertCount}
+            onAlertsClick={() => setTab("alerts")}
+          />
+
+          {/* Tab bar */}
+          <div className="border-b border-slate-700/60">
+            <div className="flex gap-1 -mb-px">
+              {(["leaderboard", "alerts"] as const).map((t) => (
+                <button
+                  key={t}
+                  onClick={() => setTab(t)}
+                  className={`px-4 py-2.5 text-sm font-medium border-b-2 transition-colors ${
+                    tab === t
+                      ? "border-yellow-400 text-white"
+                      : "border-transparent text-slate-500 hover:text-slate-300"
+                  }`}
+                >
+                  {t === "alerts" ? (
+                    <span className="flex items-center gap-2">
+                      Alerts
+                      {openAlertCount > 0 && (
+                        <span className="rounded-full bg-yellow-500 text-black text-xs font-bold px-1.5 py-0.5 leading-none">
+                          {openAlertCount}
+                        </span>
+                      )}
+                    </span>
+                  ) : (
+                    "Leaderboard"
+                  )}
+                </button>
+              ))}
+            </div>
+          </div>
+
+          {tab === "leaderboard" && (
+            <LeaderboardTable users={data.users} hasTautulli={hasTautulli} />
+          )}
+          {tab === "alerts" && <AlertsPanel />}
+        </>
+      )}
+    </main>
+  );
+}
+
+export default function Page() {
+  return (
+    <Suspense>
+      <DashboardContent />
+    </Suspense>
   );
 }
diff --git a/src/components/AlertsPanel.tsx b/src/components/AlertsPanel.tsx
new file mode 100644
index 0000000..463c881
--- /dev/null
+++ b/src/components/AlertsPanel.tsx
@@ -0,0 +1,178 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import Link from "next/link";
+import { Alert, AlertSeverity } from "@/lib/types";
+
+const severityIcon: Record<AlertSeverity, string> = {
+  danger:
+    "M12 9v3.75m-9.303 3.376c-.866 1.5.217 3.374 1.948 3.374h14.71c1.73 0 2.813-1.874 1.948-3.374L13.949 3.378c-.866-1.5-3.032-1.5-3.898 0L2.697 16.126ZM12 15.75h.007v.008H12v-.008Z",
+  warning:
+    "M12 9v3.75m9.303 3.376c.866 1.5-.217 3.374-1.948 3.374H2.645c-1.73 0-2.813-1.874-1.948-3.374l7.658-13.25c.866-1.5 3.032-1.5 3.898 0zM12 15.75h.007v.008H12v-.008z",
+  info: "m11.25 11.25.041-.02a.75.75 0 0 1 1.063.852l-.708 2.836a.75.75 0 0 0 1.063.853l.041-.021M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0Zm-9-3.75h.008v.008H12V8.25Z",
+};
+
+const severityColor: Record<AlertSeverity, string> = {
+  danger: "text-red-400",
+  warning: "text-yellow-400",
+  info: "text-blue-400",
+};
+
+function timeAgo(iso: string): string {
+  const diff = Date.now() - new Date(iso).getTime();
+  const mins = Math.floor(diff / 60_000);
+  if (mins < 60) return `${mins}m ago`;
+  const hrs = Math.floor(mins / 60);
+  if (hrs < 24) return `${hrs}h ago`;
+  const days = Math.floor(hrs / 24);
+  return `${days}d ago`;
+}
+
+export default function AlertsPanel() {
+  const [alerts, setAlerts] = useState<Alert[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [filter, setFilter] = useState<"open" | "all">("open");
+
+  useEffect(() => {
+    fetch("/api/alerts")
+      .then((r) => r.json())
+      .then(setAlerts)
+      .finally(() => setLoading(false));
+  }, []);
+
+  const filtered =
+    filter === "open" ? alerts.filter((a) => a.status === "open") : alerts;
+  const openCount = alerts.filter((a) => a.status === "open").length;
+
+  if (loading) {
+    return (
+      <div className="text-slate-600 text-sm py-12 text-center">
+        Loading alerts…
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      {/* Toolbar */}
+      <div className="flex items-center gap-3 flex-wrap">
+        <div className="flex rounded-lg overflow-hidden border border-slate-700 text-xs font-medium">
+          {(["open", "all"] as const).map((f) => (
+            <button
+              key={f}
+              onClick={() => setFilter(f)}
+              className={`px-3 py-1.5 transition-colors ${
+                filter === f
+                  ? "bg-slate-700 text-white"
+                  : "bg-transparent text-slate-500 hover:text-slate-300"
+              }`}
+            >
+              {f === "open" ? `Open (${openCount})` : `All (${alerts.length})`}
+            </button>
+          ))}
+        </div>
+        <span className="text-xs text-slate-600">
+          Click an alert to view details, add notes, or close it.
+        </span>
+      </div>
+
+      {filtered.length === 0 && (
+        <div className="rounded-xl border border-slate-700/60 bg-slate-800/30 p-12 text-center">
+          <p className="text-slate-500 text-sm">
+            {filter === "open"
+              ? "No open alerts — everything looks healthy."
+              : "No alerts recorded yet."}
+          </p>
+        </div>
+      )}
+
+      {/* Alert rows */}
+      <div className="space-y-2">
+        {filtered.map((alert) => (
+          <Link
+            key={alert.id}
+            href={`/alerts/${alert.id}`}
+            className={`flex items-start gap-3 rounded-xl border p-4 transition-colors ${
+              alert.status === "closed"
+                ? "border-slate-700/40 bg-slate-800/20 opacity-50 hover:opacity-70"
+                : "border-slate-700/60 bg-slate-800/60 hover:bg-slate-800"
+            }`}
+          >
+            {/* Severity icon */}
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              fill="none"
+              viewBox="0 0 24 24"
+              strokeWidth={1.5}
+              stroke="currentColor"
+              className={`h-5 w-5 mt-0.5 shrink-0 ${severityColor[alert.severity]}`}
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                d={severityIcon[alert.severity]}
+              />
+            </svg>
+
+            {/* Content */}
+            <div className="flex-1 min-w-0">
+              <div className="flex items-center gap-2 flex-wrap">
+                <span className="font-semibold text-white text-sm leading-snug">
+                  {alert.title}
+                </span>
+                {alert.status === "closed" && (
+                  <span
+                    className={`text-xs rounded-full px-2 py-0.5 font-medium ${
+                      alert.closeReason === "resolved"
+                        ? "bg-teal-950/60 text-teal-500 border border-teal-800/60"
+                        : "bg-slate-700/60 text-slate-500 border border-slate-600/60"
+                    }`}
+                  >
+                    {alert.closeReason === "resolved" ? "Auto-resolved" : "Closed"}
+                  </span>
+                )}
+                {alert.comments.length > 0 && (
+                  <span className="inline-flex items-center gap-1 text-xs text-slate-600">
+                    <svg
+                      xmlns="http://www.w3.org/2000/svg"
+                      fill="none"
+                      viewBox="0 0 24 24"
+                      strokeWidth={1.5}
+                      stroke="currentColor"
+                      className="h-3.5 w-3.5"
+                    >
+                      <path
+                        strokeLinecap="round"
+                        strokeLinejoin="round"
+                        d="M2.25 12.76c0 1.6 1.123 2.994 2.707 3.227 1.087.16 2.185.283 3.293.369V21l4.076-4.076a1.526 1.526 0 0 1 1.037-.443 48.282 48.282 0 0 0 5.68-.494c1.584-.233 2.707-1.626 2.707-3.228V6.741c0-1.602-1.123-2.995-2.707-3.228A48.394 48.394 0 0 0 12 3c-2.392 0-4.744.175-7.043.513C3.373 3.746 2.25 5.14 2.25 6.741v6.018Z"
+                      />
+                    </svg>
+                    {alert.comments.length}
+                  </span>
+                )}
+              </div>
+              <p className="text-sm text-slate-500 mt-0.5 line-clamp-2 leading-relaxed">
+                {alert.description}
+              </p>
+            </div>
+
+            {/* Time + chevron */}
+            <div className="flex items-center gap-1 shrink-0 mt-0.5">
+              <span className="text-xs text-slate-700">{timeAgo(alert.status === "open" ? alert.firstSeen : (alert.closedAt ?? alert.firstSeen))}</span>
+              <svg
+                xmlns="http://www.w3.org/2000/svg"
+                fill="none"
+                viewBox="0 0 24 24"
+                strokeWidth={2}
+                stroke="currentColor"
+                className="h-3.5 w-3.5 text-slate-700"
+              >
+                <path strokeLinecap="round" strokeLinejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
+              </svg>
+            </div>
+          </Link>
+        ))}
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/LeaderboardTable.tsx b/src/components/LeaderboardTable.tsx
new file mode 100644
index 0000000..52bf380
--- /dev/null
+++ b/src/components/LeaderboardTable.tsx
@@ -0,0 +1,189 @@
+"use client";
+
+import { useState } from "react";
+import { UserStat } from "@/lib/types";
+
+type SortKey = "totalBytes" | "requestCount" | "avgGB" | "plays" | "watchHours";
+
+interface LeaderboardTableProps {
+  users: UserStat[];
+  hasTautulli: boolean;
+}
+
+function formatGB(gb: number): string {
+  return gb >= 1000 ? `${(gb / 1000).toFixed(2)} TB` : `${gb.toFixed(1)} GB`;
+}
+
+function formatHours(h: number): string {
+  if (h >= 1000) return `${(h / 1000).toFixed(1)}k h`;
+  return `${h.toFixed(0)}h`;
+}
+
+function Rank({ rank, total }: { rank: number | null; total: number }) {
+  if (rank === null) return <span className="text-slate-700">—</span>;
+  return (
+    <span className="text-xs font-mono text-slate-500">
+      #{rank}<span className="text-slate-700">/{total}</span>
+    </span>
+  );
+}
+
+function SortChevrons({ active, asc }: { active: boolean; asc: boolean }) {
+  return (
+    <span className="ml-1 inline-flex flex-col gap-px opacity-0 group-hover:opacity-100 transition-opacity">
+      {active ? (
+        <svg
+          className="h-3 w-3 text-yellow-400"
+          viewBox="0 0 12 12"
+          fill="currentColor"
+        >
+          {asc
+            ? <path d="M6 2 L10 8 L2 8 Z" />
+            : <path d="M6 10 L10 4 L2 4 Z" />
+          }
+        </svg>
+      ) : (
+        <svg className="h-3 w-3 text-slate-600" viewBox="0 0 12 12" fill="currentColor">
+          <path d="M6 1 L9 5 L3 5 Z M6 11 L9 7 L3 7 Z" />
+        </svg>
+      )}
+    </span>
+  );
+}
+
+export default function LeaderboardTable({
+  users,
+  hasTautulli,
+}: LeaderboardTableProps) {
+  const [sortKey, setSortKey] = useState<SortKey>("totalBytes");
+  const [sortAsc, setSortAsc] = useState(false);
+
+  const sorted = [...users].sort((a, b) => {
+    const av = (a[sortKey] ?? -1) as number;
+    const bv = (b[sortKey] ?? -1) as number;
+    return sortAsc ? av - bv : bv - av;
+  });
+
+  function handleSort(key: SortKey) {
+    if (key === sortKey) setSortAsc((p) => !p);
+    else { setSortKey(key); setSortAsc(false); }
+  }
+
+  function Th({
+    label,
+    col,
+    right,
+  }: {
+    label: string;
+    col?: SortKey;
+    right?: boolean;
+  }) {
+    const active = col === sortKey;
+    return (
+      <th
+        onClick={col ? () => handleSort(col) : undefined}
+        className={[
+          "group py-3 px-4 text-xs font-semibold uppercase tracking-wider whitespace-nowrap select-none",
+          right ? "text-right" : "text-left",
+          col ? "cursor-pointer" : "",
+          active ? "text-yellow-400" : "text-slate-500 hover:text-slate-300",
+        ].join(" ")}
+      >
+        {label}
+        {col && <SortChevrons active={active} asc={sortAsc} />}
+      </th>
+    );
+  }
+
+  const total = users.length;
+
+  return (
+    <div className="overflow-x-auto rounded-xl border border-slate-700/60">
+      <table className="w-full text-sm">
+        <thead className="bg-slate-800/80 border-b border-slate-700/60">
+          <tr>
+            <Th label="#" />
+            <Th label="User" />
+            <Th label="Requests" col="requestCount" right />
+            <Th label="Storage" col="totalBytes" right />
+            <Th label="Avg / Req" col="avgGB" right />
+            {hasTautulli && <Th label="Plays" col="plays" right />}
+            {hasTautulli && <Th label="Watch Time" col="watchHours" right />}
+          </tr>
+        </thead>
+        <tbody className="divide-y divide-slate-700/30">
+          {sorted.map((user, idx) => (
+            <tr
+              key={user.userId}
+              className="bg-slate-900 hover:bg-slate-800/50 transition-colors"
+            >
+              {/* Row index */}
+              <td className="py-3 px-4 text-slate-700 font-mono text-xs w-10 tabular-nums">
+                {idx + 1}
+              </td>
+
+              {/* User */}
+              <td className="py-3 px-4">
+                <div className="font-medium text-white leading-snug">{user.displayName}</div>
+                <div className="text-xs text-slate-600 mt-0.5">{user.email}</div>
+              </td>
+
+              {/* Requests */}
+              <td className="py-3 px-4 text-right">
+                <div className="text-slate-300 font-mono tabular-nums">
+                  {user.requestCount.toLocaleString()}
+                </div>
+                <div className="mt-0.5 flex justify-end">
+                  <Rank rank={user.requestRank} total={total} />
+                </div>
+              </td>
+
+              {/* Storage */}
+              <td className="py-3 px-4 text-right">
+                <div className="text-white font-semibold font-mono tabular-nums">
+                  {formatGB(user.totalGB)}
+                </div>
+                <div className="mt-0.5 flex justify-end">
+                  <Rank rank={user.storageRank} total={total} />
+                </div>
+              </td>
+
+              {/* Avg / Request */}
+              <td className="py-3 px-4 text-right text-slate-500 font-mono text-xs tabular-nums">
+                {user.requestCount > 0 ? formatGB(user.avgGB) : "—"}
+              </td>
+
+              {/* Plays */}
+              {hasTautulli && (
+                <td className="py-3 px-4 text-right">
+                  <div className="text-slate-300 font-mono tabular-nums">
+                    {user.plays !== null ? user.plays.toLocaleString() : "—"}
+                  </div>
+                  <div className="mt-0.5 flex justify-end">
+                    <Rank rank={user.playsRank} total={total} />
+                  </div>
+                </td>
+              )}
+
+              {/* Watch Time */}
+              {hasTautulli && (
+                <td className="py-3 px-4 text-right">
+                  <div className="text-slate-500 font-mono text-xs tabular-nums">
+                    {user.watchHours !== null && user.watchHours > 0
+                      ? formatHours(user.watchHours)
+                      : user.watchHours === 0
+                      ? "0h"
+                      : "—"}
+                  </div>
+                  <div className="mt-0.5 flex justify-end">
+                    <Rank rank={user.watchRank} total={total} />
+                  </div>
+                </td>
+              )}
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+}
diff --git a/src/components/PercentileBadge.tsx b/src/components/PercentileBadge.tsx
new file mode 100644
index 0000000..90240ba
--- /dev/null
+++ b/src/components/PercentileBadge.tsx
@@ -0,0 +1,23 @@
+interface PercentileBadgeProps {
+  label: string;
+}
+
+const colorMap: Record<string, string> = {
+  "Top 1%": "bg-yellow-400 text-black",
+  "Top 5%": "bg-yellow-500 text-black",
+  "Top 10%": "bg-green-500 text-white",
+  "Top 25%": "bg-green-700 text-white",
+  "Top 50%": "bg-blue-600 text-white",
+  "Bottom 50%": "bg-slate-600 text-slate-300",
+};
+
+export default function PercentileBadge({ label }: PercentileBadgeProps) {
+  const colorClass = colorMap[label] ?? "bg-slate-600 text-slate-300";
+  return (
+    <span
+      className={`inline-block rounded-full px-2.5 py-0.5 text-xs font-semibold ${colorClass}`}
+    >
+      {label}
+    </span>
+  );
+}
diff --git a/src/components/RefreshButton.tsx b/src/components/RefreshButton.tsx
new file mode 100644
index 0000000..559be79
--- /dev/null
+++ b/src/components/RefreshButton.tsx
@@ -0,0 +1,32 @@
+"use client";
+
+interface RefreshButtonProps {
+  onRefresh: () => void;
+  loading: boolean;
+}
+
+export default function RefreshButton({ onRefresh, loading }: RefreshButtonProps) {
+  return (
+    <button
+      onClick={onRefresh}
+      disabled={loading}
+      className="flex items-center gap-2 rounded-lg bg-slate-800 hover:bg-slate-700 border border-slate-700 hover:border-slate-600 disabled:opacity-40 disabled:cursor-not-allowed px-3.5 py-1.5 text-sm font-medium text-slate-300 hover:text-white transition-colors"
+    >
+      <svg
+        className={`h-3.5 w-3.5 ${loading ? "animate-spin" : ""}`}
+        xmlns="http://www.w3.org/2000/svg"
+        fill="none"
+        viewBox="0 0 24 24"
+        stroke="currentColor"
+        strokeWidth={2}
+      >
+        <path
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"
+        />
+      </svg>
+      {loading ? "Loading…" : "Refresh"}
+    </button>
+  );
+}
diff --git a/src/components/SummaryCards.tsx b/src/components/SummaryCards.tsx
new file mode 100644
index 0000000..cb6e32f
--- /dev/null
+++ b/src/components/SummaryCards.tsx
@@ -0,0 +1,123 @@
+interface SummaryCardsProps {
+  totalUsers: number;
+  totalRequests: number;
+  totalStorageGB: number;
+  totalWatchHours: number | null;
+  openAlertCount: number;
+  onAlertsClick?: () => void;
+}
+
+function formatStorage(gb: number): string {
+  if (gb >= 1000) return `${(gb / 1000).toFixed(1)} TB`;
+  return `${gb.toFixed(1)} GB`;
+}
+
+function formatHours(h: number): string {
+  if (h >= 1000) return `${(h / 1000).toFixed(1)}k hrs`;
+  return `${h.toFixed(0)} hrs`;
+}
+
+// Heroicons outline paths
+const ICONS = {
+  users: "M15 19.128a9.38 9.38 0 0 0 2.625.372 9.337 9.337 0 0 0 4.121-.952 4.125 4.125 0 0 0-7.533-2.493M15 19.128v-.003c0-1.113-.285-2.16-.786-3.07M15 19.128v.106A12.318 12.318 0 0 1 8.624 21c-2.331 0-4.512-.645-6.374-1.766l-.001-.109a6.375 6.375 0 0 1 11.964-3.07M12 6.375a3.375 3.375 0 1 1-6.75 0 3.375 3.375 0 0 1 6.75 0Zm8.25 2.25a2.625 2.625 0 1 1-5.25 0 2.625 2.625 0 0 1 5.25 0Z",
+  requests: "M3.75 9.776c.112-.017.227-.026.344-.026h15.812c.117 0 .232.009.344.026m-16.5 0a2.25 2.25 0 0 0-1.883 2.542l.857 6a2.25 2.25 0 0 0 2.227 1.932H19.05a2.25 2.25 0 0 0 2.227-1.932l.857-6a2.25 2.25 0 0 0-1.883-2.542m-16.5 0V6A2.25 2.25 0 0 1 6 3.75h3.879a1.5 1.5 0 0 1 1.06.44l2.122 2.12a1.5 1.5 0 0 0 1.06.44H18A2.25 2.25 0 0 1 20.25 9v.776",
+  storage: "M20.25 6.375c0 2.278-3.694 4.125-8.25 4.125S3.75 8.653 3.75 6.375m16.5 0c0-2.278-3.694-4.125-8.25-4.125S3.75 4.097 3.75 6.375m16.5 0v11.25c0 2.278-3.694 4.125-8.25 4.125s-8.25-1.847-8.25-4.125V6.375m16.5 2.625c0 2.278-3.694 4.125-8.25 4.125s-8.25-1.847-8.25-4.125m16.5 2.625c0 2.278-3.694 4.125-8.25 4.125s-8.25-1.847-8.25-4.125",
+  watch: "M3.375 19.5h17.25m-17.25 0a1.125 1.125 0 0 1-1.125-1.125M3.375 19.5h1.5C5.496 19.5 6 18.996 6 18.375m-3.75.125v-6.375c0-.621.504-1.125 1.125-1.125H4.5m0-3.375v3.375m0-3.375h12M4.5 7.5H18a.75.75 0 0 1 .75.75v9.375c0 .621-.504 1.125-1.125 1.125h-1.5m-13.5 0h13.5m0 0v-3.375m0 3.375v-9.375c0-.621.504-1.125 1.125-1.125H21",
+  alert: "M12 9v3.75m-9.303 3.376c-.866 1.5.217 3.374 1.948 3.374h14.71c1.73 0 2.813-1.874 1.948-3.374L13.949 3.378c-.866-1.5-3.032-1.5-3.898 0L2.697 16.126ZM12 15.75h.007v.008H12v-.008Z",
+};
+
+function Card({
+  label,
+  value,
+  sub,
+  icon,
+  accent,
+  onClick,
+}: {
+  label: string;
+  value: string;
+  sub?: string;
+  icon: keyof typeof ICONS;
+  accent?: "yellow" | "green";
+  onClick?: () => void;
+}) {
+  const base = "rounded-xl border p-5 flex flex-col gap-2 transition-colors";
+  const interactive = onClick ? "cursor-pointer" : "";
+
+  let colorClass: string;
+  if (accent === "yellow") {
+    colorClass = "bg-yellow-950/30 border-yellow-700/50 hover:bg-yellow-950/50";
+  } else if (accent === "green") {
+    colorClass = "bg-green-950/30 border-green-800/50";
+  } else {
+    colorClass = `bg-slate-800/60 border-slate-700/60 ${onClick ? "hover:bg-slate-800 hover:border-slate-600" : ""}`;
+  }
+
+  return (
+    <div onClick={onClick} className={`${base} ${colorClass} ${interactive}`}>
+      <div className="flex items-center justify-between">
+        <span className="text-xs font-semibold uppercase tracking-widest text-slate-500">
+          {label}
+        </span>
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          fill="none"
+          viewBox="0 0 24 24"
+          strokeWidth={1.5}
+          stroke="currentColor"
+          className={`h-4 w-4 ${
+            accent === "yellow"
+              ? "text-yellow-500/70"
+              : accent === "green"
+              ? "text-green-500/70"
+              : "text-slate-600"
+          }`}
+        >
+          <path strokeLinecap="round" strokeLinejoin="round" d={ICONS[icon]} />
+        </svg>
+      </div>
+      <span className={`text-3xl font-bold tabular-nums ${accent === "yellow" ? "text-yellow-300" : "text-white"}`}>
+        {value}
+      </span>
+      {sub && (
+        <span className={`text-xs ${accent === "yellow" ? "text-yellow-600" : "text-slate-600"}`}>
+          {sub}
+        </span>
+      )}
+    </div>
+  );
+}
+
+export default function SummaryCards({
+  totalUsers,
+  totalRequests,
+  totalStorageGB,
+  totalWatchHours,
+  openAlertCount,
+  onAlertsClick,
+}: SummaryCardsProps) {
+  const colCount = (totalWatchHours !== null ? 1 : 0) + 4;
+
+  return (
+    <div
+      className={`grid grid-cols-2 gap-3 ${
+        colCount >= 5 ? "sm:grid-cols-5" : "sm:grid-cols-4"
+      }`}
+    >
+      <Card label="Users" value={totalUsers.toLocaleString()} icon="users" />
+      <Card label="Requests" value={totalRequests.toLocaleString()} icon="requests" />
+      <Card label="Storage" value={formatStorage(totalStorageGB)} icon="storage" />
+      {totalWatchHours !== null && (
+        <Card label="Watch Time" value={formatHours(totalWatchHours)} icon="watch" accent="green" />
+      )}
+      <Card
+        label="Open Alerts"
+        value={openAlertCount.toString()}
+        sub={openAlertCount > 0 ? "Tap to review" : "All clear"}
+        icon="alert"
+        accent={openAlertCount > 0 ? "yellow" : undefined}
+        onClick={openAlertCount > 0 ? onAlertsClick : undefined}
+      />
+    </div>
+  );
+}
diff --git a/src/lib/aggregate.ts b/src/lib/aggregate.ts
new file mode 100644
index 0000000..544595d
--- /dev/null
+++ b/src/lib/aggregate.ts
@@ -0,0 +1,146 @@
+import {
+  OverseerrUser,
+  OverseerrRequest,
+  TautulliUser,
+  MediaEntry,
+  UserStat,
+  DashboardStats,
+} from "@/lib/types";
+import { lookupTautulliUser } from "@/lib/tautulli";
+import { generateAlertCandidates } from "@/lib/alerts";
+import { upsertAlerts } from "@/lib/db";
+
+export function bytesToGB(bytes: number): number {
+  return Math.round((bytes / 1024 / 1024 / 1024) * 10) / 10;
+}
+
+/** Compute dense rank (1 = highest value, ties share the same rank). */
+function computeRanks(
+  items: Array<{ userId: number; value: number | null }>
+): Map<number, number> {
+  const withValues = items.filter((i) => i.value !== null) as Array<{
+    userId: number;
+    value: number;
+  }>;
+  const sorted = [...withValues].sort((a, b) => b.value - a.value);
+  const rankMap = new Map<number, number>();
+  let currentRank = 1;
+  for (let i = 0; i < sorted.length; i++) {
+    if (i > 0 && sorted[i].value < sorted[i - 1].value) {
+      currentRank = i + 1;
+    }
+    rankMap.set(sorted[i].userId, currentRank);
+  }
+  return rankMap;
+}
+
+export function computeStats(
+  users: OverseerrUser[],
+  allRequests: Map<number, OverseerrRequest[]>,
+  radarrMap: Map<number, MediaEntry>,
+  sonarrMap: Map<number, MediaEntry>,
+  tautulliMap: Map<string, TautulliUser> | null
+): DashboardStats {
+  const hasTautulli = tautulliMap !== null;
+
+  // Compute raw per-user totals
+  const rawStats = users.map((user) => {
+    const requests = allRequests.get(user.id) ?? [];
+    let totalBytes = 0;
+
+    for (const req of requests) {
+      if (req.type === "movie") {
+        totalBytes += radarrMap.get(req.media.tmdbId)?.sizeOnDisk ?? 0;
+      } else if (req.type === "tv" && req.media.tvdbId) {
+        totalBytes += sonarrMap.get(req.media.tvdbId)?.sizeOnDisk ?? 0;
+      }
+    }
+
+    let plays: number | null = null;
+    let watchHours: number | null = null;
+
+    if (hasTautulli && tautulliMap) {
+      const tu = lookupTautulliUser(tautulliMap, user.email, user.displayName);
+      plays = tu?.plays ?? 0;
+      watchHours = tu ? Math.round((tu.duration / 3600) * 10) / 10 : 0;
+    }
+
+    return {
+      userId: user.id,
+      displayName: user.displayName,
+      email: user.email,
+      requestCount: requests.length,
+      totalBytes,
+      plays,
+      watchHours,
+    };
+  });
+
+  const totalUsers = rawStats.length;
+
+  // Compute per-metric ranks
+  const storageRanks = computeRanks(
+    rawStats.map((r) => ({ userId: r.userId, value: r.totalBytes }))
+  );
+  const requestRanks = computeRanks(
+    rawStats.map((r) => ({ userId: r.userId, value: r.requestCount }))
+  );
+  const playsRanks = hasTautulli
+    ? computeRanks(rawStats.map((r) => ({ userId: r.userId, value: r.plays })))
+    : null;
+  const watchRanks = hasTautulli
+    ? computeRanks(
+        rawStats.map((r) => ({ userId: r.userId, value: r.watchHours }))
+      )
+    : null;
+
+  const userStats: UserStat[] = rawStats.map((raw) => {
+    const totalGB = bytesToGB(raw.totalBytes);
+    const avgGB =
+      raw.requestCount > 0
+        ? Math.round((totalGB / raw.requestCount) * 10) / 10
+        : 0;
+
+    return {
+      ...raw,
+      totalGB,
+      avgGB,
+      storageRank: storageRanks.get(raw.userId) ?? totalUsers,
+      requestRank: requestRanks.get(raw.userId) ?? totalUsers,
+      playsRank: playsRanks?.get(raw.userId) ?? null,
+      watchRank: watchRanks?.get(raw.userId) ?? null,
+      totalUsers,
+    };
+  });
+
+  // Generate alert candidates and persist to DB
+  const candidates = generateAlertCandidates(
+    userStats,
+    allRequests,
+    radarrMap,
+    sonarrMap,
+    hasTautulli
+  );
+  const openAlertCount = upsertAlerts(candidates);
+
+  const totalRequests = userStats.reduce((s, u) => s + u.requestCount, 0);
+  const totalStorageGB = bytesToGB(
+    userStats.reduce((s, u) => s + u.totalBytes, 0)
+  );
+  const totalWatchHours = hasTautulli
+    ? Math.round(userStats.reduce((s, u) => s + (u.watchHours ?? 0), 0) * 10) /
+      10
+    : null;
+
+  return {
+    users: userStats,
+    summary: {
+      totalUsers,
+      totalRequests,
+      totalStorageGB,
+      totalWatchHours,
+      openAlertCount,
+    },
+    generatedAt: new Date().toISOString(),
+  };
+}
diff --git a/src/lib/alerts.ts b/src/lib/alerts.ts
new file mode 100644
index 0000000..c343ca9
--- /dev/null
+++ b/src/lib/alerts.ts
@@ -0,0 +1,319 @@
+import { UserStat, OverseerrRequest, MediaEntry, AlertCandidate } from "@/lib/types";
+
+// ─── Tunables ─────────────────────────────────────────────────────────────────
+
+/** A movie/show must have been approved this many days ago before we alert on it */
+const UNFULFILLED_MIN_AGE_DAYS = 3;
+
+/** A pending request must be this old before we alert on it */
+const PENDING_MIN_AGE_DAYS = 7;
+
+/** User must have made their first request at least this long ago before ghost/watchrate alerts */
+const USER_MIN_AGE_DAYS = 14;
+
+/** Minimum requests before ghost/watchrate alerts */
+const MIN_REQUESTS_GHOST = 5;
+const MIN_REQUESTS_WATCHRATE = 10;
+
+/** Watch-rate threshold — below this fraction (plays/requests) triggers a warning */
+const LOW_WATCH_RATE = 0.2;
+
+/** Minimum declines in the lookback window to flag */
+const MIN_DECLINES = 3;
+const DECLINE_LOOKBACK_DAYS = 60;
+
+// ─── Helpers ──────────────────────────────────────────────────────────────────
+
+function daysSince(iso: string): number {
+  return (Date.now() - new Date(iso).getTime()) / 86_400_000;
+}
+
+// ─── Generator ───────────────────────────────────────────────────────────────
+
+export function generateAlertCandidates(
+  userStats: UserStat[],
+  allRequests: Map<number, OverseerrRequest[]>,
+  radarrMap: Map<number, MediaEntry>,
+  sonarrMap: Map<number, MediaEntry>,
+  hasTautulli: boolean
+): AlertCandidate[] {
+  const candidates: AlertCandidate[] = [];
+
+  // ── CONTENT-CENTRIC: one alert per piece of media ──────────────────────────
+
+  // Track which content we've already flagged to avoid duplicate per-user alerts
+  const flaggedMovies = new Set<number>();
+  const flaggedShows = new Set<number>();
+
+  // Collect all unfulfilled content across all users
+  // Key: tmdbId/tvdbId → { entry, requestedBy: string[], oldestApproval: Date }
+  interface UnfilledEntry {
+    entry: MediaEntry;
+    requestedBy: string[];
+    oldestAge: number; // days since oldest qualifying request
+  }
+  const unfilledMovies = new Map<number, UnfilledEntry>();
+  const unfilledShows = new Map<number, UnfilledEntry>();
+
+  for (const user of userStats) {
+    const requests = allRequests.get(user.userId) ?? [];
+
+    for (const req of requests) {
+      // Only look at approved requests old enough to have been expected to download
+      if (req.status !== 2) continue;
+      const age = daysSince(req.createdAt);
+      if (age < UNFULFILLED_MIN_AGE_DAYS) continue;
+
+      if (req.type === "movie") {
+        const entry = radarrMap.get(req.media.tmdbId);
+        // Skip if not yet released (Radarr's isAvailable = false)
+        if (entry && !entry.available) continue;
+        const isUnfilled = !entry || entry.sizeOnDisk === 0;
+        if (!isUnfilled) continue;
+
+        const title =
+          entry?.title ?? req.media.title ?? `Movie #${req.media.tmdbId}`;
+        const existing = unfilledMovies.get(req.media.tmdbId);
+        if (existing) {
+          if (!existing.requestedBy.includes(user.displayName))
+            existing.requestedBy.push(user.displayName);
+          existing.oldestAge = Math.max(existing.oldestAge, age);
+        } else {
+          unfilledMovies.set(req.media.tmdbId, {
+            entry: { title, sizeOnDisk: 0, available: true },
+            requestedBy: [user.displayName],
+            oldestAge: age,
+          });
+        }
+      } else if (req.type === "tv" && req.media.tvdbId) {
+        const entry = sonarrMap.get(req.media.tvdbId);
+        // Skip if series hasn't started airing yet (Sonarr status = "upcoming")
+        if (entry && !entry.available) continue;
+
+        const isNothingDownloaded = !entry || entry.sizeOnDisk === 0;
+        // Partial: ended series with < 90% of episodes on disk
+        const isPartiallyDownloaded =
+          entry !== undefined &&
+          entry.sizeOnDisk > 0 &&
+          entry.seriesStatus === "ended" &&
+          entry.percentOfEpisodes !== undefined &&
+          entry.percentOfEpisodes < 90;
+        const isUnfilled = isNothingDownloaded || isPartiallyDownloaded;
+        if (!isUnfilled) continue;
+
+        const title =
+          entry?.title ?? req.media.title ?? `Show #${req.media.tvdbId}`;
+        const partial = !isNothingDownloaded && isPartiallyDownloaded;
+        const existing = unfilledShows.get(req.media.tvdbId);
+        if (existing) {
+          if (!existing.requestedBy.includes(user.displayName))
+            existing.requestedBy.push(user.displayName);
+          existing.oldestAge = Math.max(existing.oldestAge, age);
+          // Upgrade to partial flag if we now know it's partial
+          if (partial) (existing as UnfilledEntry & { partial?: boolean }).partial = true;
+        } else {
+          const record: UnfilledEntry & { partial?: boolean } = {
+            entry: { title, sizeOnDisk: entry?.sizeOnDisk ?? 0, available: true },
+            requestedBy: [user.displayName],
+            oldestAge: age,
+          };
+          if (partial) record.partial = true;
+          unfilledShows.set(req.media.tvdbId, record);
+        }
+      }
+    }
+  }
+
+  for (const [tmdbId, { entry, requestedBy, oldestAge }] of unfilledMovies) {
+    if (flaggedMovies.has(tmdbId)) continue;
+    flaggedMovies.add(tmdbId);
+    const daysStr = Math.floor(oldestAge) === 1 ? "1 day" : `${Math.floor(oldestAge)} days`;
+    const byStr = requestedBy.slice(0, 3).join(", ") + (requestedBy.length > 3 ? ` +${requestedBy.length - 3}` : "");
+    candidates.push({
+      key: `unfulfilled:movie:${tmdbId}`,
+      category: "unfulfilled",
+      severity: "warning",
+      title: `Not Downloaded: ${entry.title}`,
+      description: `Approved ${daysStr} ago but no file found in Radarr. Requested by ${byStr}.`,
+      mediaId: tmdbId,
+      mediaType: "movie",
+      mediaTitle: entry.title,
+    });
+  }
+
+  for (const [tvdbId, data] of unfilledShows) {
+    if (flaggedShows.has(tvdbId)) continue;
+    flaggedShows.add(tvdbId);
+    const { entry, requestedBy, oldestAge } = data;
+    const partial = (data as UnfilledEntry & { partial?: boolean }).partial ?? false;
+    const sonarrEntry = sonarrMap.get(tvdbId);
+    const daysStr = Math.floor(oldestAge) === 1 ? "1 day" : `${Math.floor(oldestAge)} days`;
+    const byStr = requestedBy.slice(0, 3).join(", ") + (requestedBy.length > 3 ? ` +${requestedBy.length - 3}` : "");
+    const pct = partial && sonarrEntry?.episodeFileCount !== undefined && sonarrEntry.totalEpisodeCount
+      ? Math.round((sonarrEntry.episodeFileCount / sonarrEntry.totalEpisodeCount) * 100)
+      : null;
+    const description = partial && pct !== null
+      ? `Only ${pct}% of episodes downloaded (${sonarrEntry!.episodeFileCount}/${sonarrEntry!.totalEpisodeCount}). Approved ${daysStr} ago. Requested by ${byStr}.`
+      : `Approved ${daysStr} ago but no files found in Sonarr. Requested by ${byStr}.`;
+    candidates.push({
+      key: `unfulfilled:tv:${tvdbId}`,
+      category: "unfulfilled",
+      severity: "warning",
+      title: partial ? `Incomplete Download: ${entry.title}` : `Not Downloaded: ${entry.title}`,
+      description,
+      mediaId: tvdbId,
+      mediaType: "tv",
+      mediaTitle: entry.title,
+    });
+  }
+
+  // ── CONTENT-CENTRIC: stale pending requests ───────────────────────────────
+  // One alert per pending request item (not per user)
+  const flaggedPending = new Set<number>();
+
+  for (const user of userStats) {
+    const requests = allRequests.get(user.userId) ?? [];
+    for (const req of requests) {
+      if (req.status !== 1) continue;
+      if (daysSince(req.createdAt) < PENDING_MIN_AGE_DAYS) continue;
+
+      const age = Math.floor(daysSince(req.createdAt));
+      const ageStr = age === 1 ? "1 day" : `${age} days`;
+
+      if (req.type === "movie" && !flaggedPending.has(req.id)) {
+        // Skip if movie isn't released yet
+        const movieEntry = radarrMap.get(req.media.tmdbId);
+        if (movieEntry && !movieEntry.available) continue;
+        flaggedPending.add(req.id);
+        const title =
+          radarrMap.get(req.media.tmdbId)?.title ??
+          req.media.title ??
+          `Movie #${req.media.tmdbId}`;
+        candidates.push({
+          key: `pending:req:${req.id}`,
+          category: "pending",
+          severity: "warning",
+          title: `Pending Approval: ${title}`,
+          description: `Awaiting approval for ${ageStr}. Requested by ${user.displayName}.`,
+          mediaId: req.media.tmdbId,
+          mediaType: "movie",
+          mediaTitle: title,
+          userId: user.userId,
+          userName: user.displayName,
+        });
+      } else if (req.type === "tv" && req.media.tvdbId && !flaggedPending.has(req.id)) {
+        // Skip if show hasn't started airing yet
+        const showEntry = sonarrMap.get(req.media.tvdbId);
+        if (showEntry && !showEntry.available) continue;
+        flaggedPending.add(req.id);
+        const title =
+          showEntry?.title ?? req.media.title ?? `Show #${req.media.tvdbId}`;
+        candidates.push({
+          key: `pending:req:${req.id}`,
+          category: "pending",
+          severity: "warning",
+          title: `Pending Approval: ${title}`,
+          description: `Awaiting approval for ${ageStr}. Requested by ${user.displayName}.`,
+          mediaId: req.media.tvdbId,
+          mediaType: "tv",
+          mediaTitle: title,
+          userId: user.userId,
+          userName: user.displayName,
+        });
+      }
+    }
+  }
+
+  // ── USER-BEHAVIOR: one category per user, most severe wins ───────────────
+  // Ghost Requester takes priority over Low Watch Rate for the same user.
+  // Only generate these alerts if the user is "established" (old enough account).
+
+  for (const user of userStats) {
+    const requests = allRequests.get(user.userId) ?? [];
+    if (requests.length === 0) continue;
+
+    // Check if user is established (has at least one request old enough)
+    const oldestRequestAge = Math.max(...requests.map((r) => daysSince(r.createdAt)));
+    const isEstablished = oldestRequestAge >= USER_MIN_AGE_DAYS;
+    if (!isEstablished) continue;
+
+    // ── Ghost Requester ───────────────────────────────────────────────────
+    if (
+      hasTautulli &&
+      user.plays === 0 &&
+      user.requestCount >= MIN_REQUESTS_GHOST
+    ) {
+      candidates.push({
+        key: `ghost:${user.userId}`,
+        category: "ghost",
+        severity: "warning",
+        title: `Ghost Requester`,
+        description: `${user.displayName} has ${user.requestCount} requests but has never watched anything on Plex.`,
+        userId: user.userId,
+        userName: user.displayName,
+      });
+      // Ghost takes priority — skip watch-rate check for this user
+      continue;
+    }
+
+    // ── Low Watch Rate ────────────────────────────────────────────────────
+    if (
+      hasTautulli &&
+      user.plays !== null &&
+      user.plays > 0 &&
+      user.requestCount >= MIN_REQUESTS_WATCHRATE
+    ) {
+      const ratio = user.plays / user.requestCount;
+      if (ratio < LOW_WATCH_RATE) {
+        const pct = Math.round(ratio * 100);
+        candidates.push({
+          key: `watchrate:${user.userId}`,
+          category: "watchrate",
+          severity: "info",
+          title: `Low Watch Rate`,
+          description: `${user.displayName} watches ~${pct}% of what they request (${user.plays.toLocaleString()} plays, ${user.requestCount} requests).`,
+          userId: user.userId,
+          userName: user.displayName,
+        });
+        continue; // don't also check declines for same priority slot
+      }
+    }
+
+    // ── Declined Streak ───────────────────────────────────────────────────
+    const recentDeclines = requests.filter(
+      (r) => r.status === 3 && daysSince(r.createdAt) <= DECLINE_LOOKBACK_DAYS
+    );
+    if (recentDeclines.length >= MIN_DECLINES) {
+      candidates.push({
+        key: `declined:${user.userId}`,
+        category: "declined",
+        severity: "info",
+        title: `Frequent Declines`,
+        description: `${user.displayName} has had ${recentDeclines.length} requests declined in the last ${DECLINE_LOOKBACK_DAYS} days.`,
+        userId: user.userId,
+        userName: user.displayName,
+      });
+    }
+  }
+
+  // ── SYSTEM: Tautulli configured but no matches ────────────────────────────
+  if (hasTautulli) {
+    const totalPlays = userStats.reduce((s, u) => s + (u.plays ?? 0), 0);
+    if (totalPlays === 0 && userStats.length > 0) {
+      candidates.push({
+        key: "tautulli-no-matches",
+        category: "tautulli-no-matches",
+        severity: "danger",
+        title: "No Tautulli Watch Data",
+        description:
+          "Tautulli is configured but no plays were matched to any user. Check that emails align between Overseerr and Tautulli.",
+      });
+    }
+  }
+
+  // Sort: danger → warning → info
+  const order: Record<string, number> = { danger: 0, warning: 1, info: 2 };
+  candidates.sort((a, b) => order[a.severity] - order[b.severity]);
+
+  return candidates;
+}
diff --git a/src/lib/db.ts b/src/lib/db.ts
new file mode 100644
index 0000000..730ee78
--- /dev/null
+++ b/src/lib/db.ts
@@ -0,0 +1,243 @@
+/**
+ * Lightweight JSON file store for alert persistence.
+ * Lives at data/alerts.json (gitignored, created on first run).
+ */
+
+import { readFileSync, writeFileSync, mkdirSync, existsSync } from "fs";
+import { join } from "path";
+import {
+  AlertCandidate,
+  AlertStatus,
+  AlertCloseReason,
+  AlertComment,
+  Alert,
+} from "./types";
+
+const DATA_DIR = join(process.cwd(), "data");
+const DB_PATH = join(DATA_DIR, "alerts.json");
+
+// Cooldown days applied on MANUAL close — suppresses re-opening for this long.
+// Auto-resolved alerts have no cooldown and can reopen immediately if the
+// condition returns.
+const COOLDOWN: Record<string, number> = {
+  unfulfilled: 3,
+  pending: 3,
+  ghost: 14,
+  watchrate: 14,
+  declined: 14,
+  "tautulli-no-matches": 1,
+  "dark-library": 30,
+};
+const DEFAULT_COOLDOWN = 7;
+
+interface Store {
+  nextId: number;
+  nextCommentId: number;
+  alerts: Record<string, StoredAlert>; // keyed by alert.key
+}
+
+interface StoredAlert {
+  id: number;
+  key: string;
+  category: string;
+  severity: string;
+  title: string;
+  description: string;
+  userId?: number;
+  userName?: string;
+  mediaId?: number;
+  mediaType?: string;
+  mediaTitle?: string;
+  status: AlertStatus;
+  closeReason: AlertCloseReason | null;
+  suppressedUntil: string | null;
+  firstSeen: string;
+  lastSeen: string;
+  closedAt: string | null;
+  comments: Array<{ id: number; body: string; createdAt: string }>;
+}
+
+function load(): Store {
+  if (!existsSync(DATA_DIR)) mkdirSync(DATA_DIR, { recursive: true });
+  if (!existsSync(DB_PATH)) {
+    const empty: Store = { nextId: 1, nextCommentId: 1, alerts: {} };
+    writeFileSync(DB_PATH, JSON.stringify(empty, null, 2));
+    return empty;
+  }
+  return JSON.parse(readFileSync(DB_PATH, "utf-8")) as Store;
+}
+
+function save(store: Store) {
+  writeFileSync(DB_PATH, JSON.stringify(store, null, 2));
+}
+
+function toAlert(s: StoredAlert): Alert {
+  return {
+    id: s.id,
+    key: s.key,
+    category: s.category,
+    severity: s.severity as Alert["severity"],
+    title: s.title,
+    description: s.description,
+    userId: s.userId,
+    userName: s.userName,
+    mediaId: s.mediaId,
+    mediaType: s.mediaType as Alert["mediaType"],
+    mediaTitle: s.mediaTitle,
+    status: s.status,
+    closeReason: s.closeReason ?? null,
+    suppressedUntil: s.suppressedUntil,
+    firstSeen: s.firstSeen,
+    lastSeen: s.lastSeen,
+    closedAt: s.closedAt,
+    comments: s.comments,
+  };
+}
+
+/**
+ * Merge generated candidates into the store, then auto-resolve any open alerts
+ * whose condition is no longer present (key not in this run's candidate set).
+ *
+ * Auto-resolved alerts:
+ * - Are marked closed with closeReason = "resolved"
+ * - Have NO suppressedUntil — they can reopen immediately if the condition returns
+ *
+ * Manually closed alerts:
+ * - Have suppressedUntil set (cooldown per category)
+ * - Won't be re-opened by upsertAlerts until that cooldown expires
+ *
+ * Returns the count of open alerts after the merge.
+ */
+export function upsertAlerts(candidates: AlertCandidate[]): number {
+  const store = load();
+  const now = new Date();
+  const nowISO = now.toISOString();
+  const candidateKeys = new Set(candidates.map((c) => c.key));
+
+  // ── Step 1: upsert candidates ─────────────────────────────────────────────
+  for (const c of candidates) {
+    const existing = store.alerts[c.key];
+
+    if (existing) {
+      const isSuppressed =
+        existing.status === "closed" &&
+        existing.suppressedUntil !== null &&
+        new Date(existing.suppressedUntil) > now;
+
+      if (isSuppressed) continue;
+
+      // Re-open if previously closed (manually or resolved) and not suppressed
+      if (existing.status === "closed") {
+        existing.status = "open";
+        existing.closeReason = null;
+        existing.closedAt = null;
+        existing.suppressedUntil = null;
+        existing.firstSeen = nowISO; // treat as a new occurrence
+        existing.comments = [];
+      }
+
+      // Refresh content and lastSeen
+      existing.lastSeen = nowISO;
+      existing.title = c.title;
+      existing.description = c.description;
+      if (c.userName) existing.userName = c.userName;
+      if (c.mediaTitle) existing.mediaTitle = c.mediaTitle;
+    } else {
+      store.alerts[c.key] = {
+        id: store.nextId++,
+        key: c.key,
+        category: c.category,
+        severity: c.severity,
+        title: c.title,
+        description: c.description,
+        userId: c.userId,
+        userName: c.userName,
+        mediaId: c.mediaId,
+        mediaType: c.mediaType,
+        mediaTitle: c.mediaTitle,
+        status: "open",
+        closeReason: null,
+        suppressedUntil: null,
+        firstSeen: nowISO,
+        lastSeen: nowISO,
+        closedAt: null,
+        comments: [],
+      };
+    }
+  }
+
+  // ── Step 2: auto-resolve alerts whose condition is gone ───────────────────
+  for (const alert of Object.values(store.alerts)) {
+    if (alert.status !== "open") continue;
+    if (candidateKeys.has(alert.key)) continue;
+
+    // Condition no longer exists — resolve it automatically, no cooldown
+    alert.status = "closed";
+    alert.closeReason = "resolved";
+    alert.closedAt = nowISO;
+    alert.suppressedUntil = null;
+  }
+
+  save(store);
+
+  return Object.values(store.alerts).filter((a) => a.status === "open").length;
+}
+
+export function getAllAlerts(): Alert[] {
+  const store = load();
+  return Object.values(store.alerts)
+    .sort((a, b) => {
+      if (a.status !== b.status) return a.status === "open" ? -1 : 1;
+      return new Date(b.lastSeen).getTime() - new Date(a.lastSeen).getTime();
+    })
+    .map(toAlert);
+}
+
+export function getAlertById(id: number): Alert | null {
+  const store = load();
+  const found = Object.values(store.alerts).find((a) => a.id === id);
+  return found ? toAlert(found) : null;
+}
+
+export function closeAlert(id: number): Alert | null {
+  const store = load();
+  const alert = Object.values(store.alerts).find((a) => a.id === id);
+  if (!alert) return null;
+
+  const cooldownDays = COOLDOWN[alert.category] ?? DEFAULT_COOLDOWN;
+  const suppressUntil = new Date();
+  suppressUntil.setDate(suppressUntil.getDate() + cooldownDays);
+
+  alert.status = "closed";
+  alert.closeReason = "manual";
+  alert.closedAt = new Date().toISOString();
+  alert.suppressedUntil = suppressUntil.toISOString();
+  save(store);
+  return toAlert(alert);
+}
+
+export function reopenAlert(id: number): Alert | null {
+  const store = load();
+  const alert = Object.values(store.alerts).find((a) => a.id === id);
+  if (!alert) return null;
+  alert.status = "open";
+  alert.closeReason = null;
+  alert.closedAt = null;
+  alert.suppressedUntil = null;
+  save(store);
+  return toAlert(alert);
+}
+
+export function addComment(alertId: number, body: string): AlertComment | null {
+  const store = load();
+  const alert = Object.values(store.alerts).find((a) => a.id === alertId);
+  if (!alert) return null;
+  const comment = {
+    id: store.nextCommentId++,
+    body,
+    createdAt: new Date().toISOString(),
+  };
+  alert.comments.push(comment);
+  save(store);
+  return comment;
+}
diff --git a/src/lib/overseerr.ts b/src/lib/overseerr.ts
new file mode 100644
index 0000000..45455d6
--- /dev/null
+++ b/src/lib/overseerr.ts
@@ -0,0 +1,51 @@
+import { OverseerrUser, OverseerrRequest } from "@/lib/types";
+
+const TAKE = 100;
+
+export async function fetchAllUsers(): Promise<OverseerrUser[]> {
+  const all: OverseerrUser[] = [];
+  let skip = 0;
+
+  while (true) {
+    const res = await fetch(
+      `${process.env.SEERR_URL}/api/v1/user?take=${TAKE}&skip=${skip}&sort=created`,
+      { headers: { "X-Api-Key": process.env.SEERR_API! } }
+    );
+
+    if (!res.ok) {
+      throw new Error(`Overseerr users API error: ${res.status} ${res.statusText}`);
+    }
+
+    const data: { results: OverseerrUser[] } = await res.json();
+    all.push(...data.results);
+
+    if (data.results.length < TAKE) break;
+    skip += TAKE;
+  }
+
+  return all;
+}
+
+export async function fetchUserRequests(userId: number): Promise<OverseerrRequest[]> {
+  const all: OverseerrRequest[] = [];
+  let skip = 0;
+
+  while (true) {
+    const res = await fetch(
+      `${process.env.SEERR_URL}/api/v1/request?requestedBy=${userId}&take=${TAKE}&skip=${skip}`,
+      { headers: { "X-Api-Key": process.env.SEERR_API! } }
+    );
+
+    if (!res.ok) {
+      throw new Error(`Overseerr requests API error for user ${userId}: ${res.status} ${res.statusText}`);
+    }
+
+    const data: { results: OverseerrRequest[] } = await res.json();
+    all.push(...data.results);
+
+    if (data.results.length < TAKE) break;
+    skip += TAKE;
+  }
+
+  return all;
+}
diff --git a/src/lib/radarr.ts b/src/lib/radarr.ts
new file mode 100644
index 0000000..8e00868
--- /dev/null
+++ b/src/lib/radarr.ts
@@ -0,0 +1,19 @@
+import { RadarrMovie, MediaEntry } from "@/lib/types";
+
+export async function buildRadarrMap(): Promise<Map<number, MediaEntry>> {
+  const res = await fetch(`${process.env.RADARR_URL}/api/v3/movie`, {
+    headers: { "X-Api-Key": process.env.RADARR_API! },
+  });
+
+  if (!res.ok) {
+    throw new Error(`Radarr API error: ${res.status} ${res.statusText}`);
+  }
+
+  const movies: RadarrMovie[] = await res.json();
+  return new Map(
+    movies.map((m) => [
+      m.tmdbId,
+      { title: m.title, sizeOnDisk: m.sizeOnDisk, available: m.isAvailable },
+    ])
+  );
+}
diff --git a/src/lib/sonarr.ts b/src/lib/sonarr.ts
new file mode 100644
index 0000000..215ce6e
--- /dev/null
+++ b/src/lib/sonarr.ts
@@ -0,0 +1,28 @@
+import { SonarrSeries, MediaEntry } from "@/lib/types";
+
+export async function buildSonarrMap(): Promise<Map<number, MediaEntry>> {
+  const res = await fetch(`${process.env.SONARR_URL}/api/v3/series`, {
+    headers: { "X-Api-Key": process.env.SONARR_API! },
+  });
+
+  if (!res.ok) {
+    throw new Error(`Sonarr API error: ${res.status} ${res.statusText}`);
+  }
+
+  const series: SonarrSeries[] = await res.json();
+  return new Map(
+    series.map((s) => [
+      s.tvdbId,
+      {
+        title: s.title,
+        sizeOnDisk: s.statistics.sizeOnDisk,
+        // "upcoming" = series hasn't started airing yet
+        available: s.status !== "upcoming",
+        episodeFileCount: s.statistics.episodeFileCount,
+        totalEpisodeCount: s.statistics.totalEpisodeCount,
+        percentOfEpisodes: s.statistics.percentOfEpisodes,
+        seriesStatus: s.status,
+      },
+    ])
+  );
+}
diff --git a/src/lib/tautulli.ts b/src/lib/tautulli.ts
new file mode 100644
index 0000000..84bfa2e
--- /dev/null
+++ b/src/lib/tautulli.ts
@@ -0,0 +1,78 @@
+import { TautulliUser } from "@/lib/types";
+
+interface TautulliRow {
+  friendly_name: string;
+  email: string;
+  plays: number;
+  duration: number;
+  last_seen: number | null;
+}
+
+interface TautulliResponse {
+  response: {
+    result: string;
+    data: {
+      data: TautulliRow[];
+    };
+  };
+}
+
+/**
+ * Returns a Map<lowercaseEmail, TautulliUser>.
+ * Returns null if TAUTULLI_URL/TAUTULLI_API are not set.
+ */
+export async function buildTautulliMap(): Promise<Map<string, TautulliUser> | null> {
+  const url = process.env.TAUTULLI_URL;
+  const key = process.env.TAUTULLI_API;
+
+  if (!url || !key) return null;
+
+  const res = await fetch(
+    `${url}/api/v2?apikey=${key}&cmd=get_users_table&length=1000&order_column=friendly_name&order_dir=asc`,
+    { cache: "no-store" }
+  );
+
+  if (!res.ok) {
+    throw new Error(`Tautulli API error: ${res.status} ${res.statusText}`);
+  }
+
+  const json: TautulliResponse = await res.json();
+
+  if (json.response.result !== "success") {
+    throw new Error(`Tautulli API returned non-success result`);
+  }
+
+  const map = new Map<string, TautulliUser>();
+
+  for (const row of json.response.data.data) {
+    const user: TautulliUser = {
+      friendly_name: row.friendly_name,
+      email: row.email ?? "",
+      plays: row.plays ?? 0,
+      duration: row.duration ?? 0,
+      last_seen: row.last_seen ?? null,
+    };
+
+    if (user.email) {
+      map.set(user.email.toLowerCase(), user);
+    }
+    // Also index by friendly_name as fallback key
+    if (user.friendly_name) {
+      map.set(`name:${user.friendly_name.toLowerCase()}`, user);
+    }
+  }
+
+  return map;
+}
+
+export function lookupTautulliUser(
+  tautulliMap: Map<string, TautulliUser>,
+  email: string,
+  displayName: string
+): TautulliUser | null {
+  return (
+    tautulliMap.get(email.toLowerCase()) ??
+    tautulliMap.get(`name:${displayName.toLowerCase()}`) ??
+    null
+  );
+}
diff --git a/src/lib/types.ts b/src/lib/types.ts
new file mode 100644
index 0000000..4544da7
--- /dev/null
+++ b/src/lib/types.ts
@@ -0,0 +1,134 @@
+// ─── Raw API shapes ───────────────────────────────────────────────────────────
+
+export interface OverseerrUser {
+  id: number;
+  displayName: string;
+  email: string;
+  requestCount: number;
+  userType: number;
+}
+
+export interface OverseerrRequest {
+  id: number;
+  type: "movie" | "tv";
+  status: number; // 1=pending, 2=approved, 3=declined, 4=available
+  createdAt: string; // ISO timestamp
+  media: {
+    tmdbId: number;
+    tvdbId?: number;
+    title?: string;
+  };
+}
+
+export interface RadarrMovie {
+  tmdbId: number;
+  title: string;
+  sizeOnDisk: number; // bytes
+  isAvailable: boolean; // false = unreleased / below minimum availability
+}
+
+export interface SonarrSeries {
+  tvdbId: number;
+  title: string;
+  status: string; // "continuing" | "ended" | "upcoming" | "deleted"
+  statistics: {
+    sizeOnDisk: number; // bytes
+    episodeFileCount: number;
+    totalEpisodeCount: number;
+    percentOfEpisodes: number; // 0–100
+  };
+}
+
+export interface TautulliUser {
+  friendly_name: string;
+  email: string;
+  plays: number;
+  duration: number; // seconds
+  last_seen: number | null; // unix timestamp
+}
+
+// ─── Richer map value types ───────────────────────────────────────────────────
+
+export interface MediaEntry {
+  title: string;
+  sizeOnDisk: number; // bytes
+  available: boolean; // false = unreleased, skip unfulfilled alerts
+  // TV-specific (undefined for movies)
+  episodeFileCount?: number;
+  totalEpisodeCount?: number;
+  percentOfEpisodes?: number; // 0–100
+  seriesStatus?: string; // "continuing" | "ended" | "upcoming" | "deleted"
+}
+
+// ─── Aggregated output ────────────────────────────────────────────────────────
+
+export interface UserStat {
+  userId: number;
+  displayName: string;
+  email: string;
+  requestCount: number;
+  totalBytes: number;
+  totalGB: number;
+  avgGB: number;
+  // Tautulli (null when not configured)
+  plays: number | null;
+  watchHours: number | null;
+  // Per-metric ranks (1 = top user for that metric, null = Tautulli not available)
+  storageRank: number;
+  requestRank: number;
+  playsRank: number | null;
+  watchRank: number | null;
+  totalUsers: number;
+}
+
+export interface DashboardStats {
+  users: UserStat[];
+  summary: {
+    totalUsers: number;
+    totalRequests: number;
+    totalStorageGB: number;
+    totalWatchHours: number | null;
+    openAlertCount: number;
+  };
+  generatedAt: string;
+}
+
+// ─── Alerts ───────────────────────────────────────────────────────────────────
+
+export type AlertSeverity = "danger" | "warning" | "info";
+export type AlertStatus = "open" | "closed";
+
+/** In-memory candidate produced by alert generation logic */
+export interface AlertCandidate {
+  key: string; // deterministic dedup key, e.g. "unfulfilled:movie:12345"
+  category: string; // e.g. "unfulfilled", "ghost", "pending"
+  severity: AlertSeverity;
+  title: string;
+  description: string;
+  // At most one of userId or mediaId is the "subject"
+  userId?: number;
+  userName?: string;
+  mediaId?: number;
+  mediaType?: "movie" | "tv";
+  mediaTitle?: string;
+}
+
+export interface AlertComment {
+  id: number;
+  body: string;
+  createdAt: string;
+}
+
+export type AlertCloseReason = "manual" | "resolved";
+
+/** Full persisted alert returned by the API */
+export interface Alert extends AlertCandidate {
+  id: number; // auto-increment DB id (used in URLs)
+  status: AlertStatus;
+  closeReason: AlertCloseReason | null; // null = still open
+  suppressedUntil: string | null;       // only set on manual close
+  firstSeen: string;
+  lastSeen: string;
+  closedAt: string | null;
+  comments: AlertComment[];
+}