ZXDB: Releases browser filters, schema lists, and fixes

- UI: Add /zxdb hub cards for Entries and Releases; implement Releases browser
  with URL‑synced filters (q, year, sort, DL language/machine, file/scheme/source/case, demo)
  and a paginated table (Entry ID, Title, Release #, Year).
- API: Add GET /api/zxdb/releases/search (Zod‑validated, Node runtime) supporting
  title, year, sort, and downloads‑based filters; return paged JSON.
- Repo: Rewrite searchReleases to Drizzle QB; correct ORDER BY on releases.release_year;
  implement EXISTS on downloads using explicit "from downloads as d"; return JSON‑safe rows.
- Schema: Align Drizzle models with ZXDB for releases/downloads; add lookups
  availabletypes, currencies, roletypes, and roles relation.
- API (lookups): Add GET /api/zxdb/{availabletypes,currencies,roletypes} for dropdowns.
- Stability: JSON‑clone SSR payloads before passing to Client Components to avoid
  RowDataPacket serialization errors.

Signed-off-by: Junie@lucy.xalior.com

src/app/api/zxdb/availabletypes/route.ts

@@ -0,0 +1,10 @@
+import { listAvailabletypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listAvailabletypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/casetypes/route.ts

@@ -0,0 +1,10 @@
+import { listCasetypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listCasetypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/currencies/route.ts

@@ -0,0 +1,10 @@
+import { listCurrencies } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listCurrencies();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/filetypes/route.ts

@@ -0,0 +1,10 @@
+import { listFiletypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listFiletypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/releases/search/route.ts

@@ -0,0 +1,48 @@
+import { NextRequest } from "next/server";
+import { z } from "zod";
+import { searchReleases } from "@/server/repo/zxdb";
+
+const querySchema = z.object({
+  q: z.string().optional(),
+  page: z.coerce.number().int().positive().optional(),
+  pageSize: z.coerce.number().int().positive().max(100).optional(),
+  year: z.coerce.number().int().optional(),
+  sort: z.enum(["year_desc", "year_asc", "title", "entry_id_desc"]).optional(),
+  dLanguageId: z.string().trim().length(2).optional(),
+  dMachinetypeId: z.coerce.number().int().positive().optional(),
+  filetypeId: z.coerce.number().int().positive().optional(),
+  schemetypeId: z.string().trim().length(2).optional(),
+  sourcetypeId: z.string().trim().length(1).optional(),
+  casetypeId: z.string().trim().length(1).optional(),
+  isDemo: z.coerce.boolean().optional(),
+});
+
+export async function GET(req: NextRequest) {
+  const { searchParams } = new URL(req.url);
+  const parsed = querySchema.safeParse({
+    q: searchParams.get("q") ?? undefined,
+    page: searchParams.get("page") ?? undefined,
+    pageSize: searchParams.get("pageSize") ?? undefined,
+    year: searchParams.get("year") ?? undefined,
+    sort: searchParams.get("sort") ?? undefined,
+    dLanguageId: searchParams.get("dLanguageId") ?? undefined,
+    dMachinetypeId: searchParams.get("dMachinetypeId") ?? undefined,
+    filetypeId: searchParams.get("filetypeId") ?? undefined,
+    schemetypeId: searchParams.get("schemetypeId") ?? undefined,
+    sourcetypeId: searchParams.get("sourcetypeId") ?? undefined,
+    casetypeId: searchParams.get("casetypeId") ?? undefined,
+    isDemo: searchParams.get("isDemo") ?? undefined,
+  });
+  if (!parsed.success) {
+    return new Response(JSON.stringify({ error: parsed.error.flatten() }), {
+      status: 400,
+      headers: { "content-type": "application/json" },
+    });
+  }
+  const data = await searchReleases(parsed.data);
+  return new Response(JSON.stringify(data), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/roletypes/route.ts

@@ -0,0 +1,10 @@
+import { listRoletypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listRoletypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/schemetypes/route.ts

@@ -0,0 +1,10 @@
+import { listSchemetypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listSchemetypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/api/zxdb/sourcetypes/route.ts

@@ -0,0 +1,10 @@
+import { listSourcetypes } from "@/server/repo/zxdb";
+
+export async function GET() {
+  const items = await listSourcetypes();
+  return new Response(JSON.stringify({ items }), {
+    headers: { "content-type": "application/json" },
+  });
+}
+
+export const runtime = "nodejs";

src/app/zxdb/entries/EntriesExplorer.tsx

@@ -0,0 +1,324 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import Link from "next/link";
+import { usePathname, useRouter } from "next/navigation";
+
+type Item = {
+  id: number;
+  title: string;
+  isXrated: number;
+  machinetypeId: number | null;
+  machinetypeName?: string | null;
+  languageId: string | null;
+  languageName?: string | null;
+};
+
+type Paged<T> = {
+  items: T[];
+  page: number;
+  pageSize: number;
+  total: number;
+};
+
+export default function EntriesExplorer({
+  initial,
+  initialGenres,
+  initialLanguages,
+  initialMachines,
+  initialUrlState,
+}: {
+  initial?: Paged<Item>;
+  initialGenres?: { id: number; name: string }[];
+  initialLanguages?: { id: string; name: string }[];
+  initialMachines?: { id: number; name: string }[];
+  initialUrlState?: {
+    q: string;
+    page: number;
+    genreId: string | number | "";
+    languageId: string | "";
+    machinetypeId: string | number | "";
+    sort: "title" | "id_desc";
+  };
+}) {
+  const router = useRouter();
+  const pathname = usePathname();
+
+  const [q, setQ] = useState(initialUrlState?.q ?? "");
+  const [page, setPage] = useState(initial?.page ?? initialUrlState?.page ?? 1);
+  const [loading, setLoading] = useState(false);
+  const [data, setData] = useState<Paged<Item> | null>(initial ?? null);
+  const [genres, setGenres] = useState<{ id: number; name: string }[]>(initialGenres ?? []);
+  const [languages, setLanguages] = useState<{ id: string; name: string }[]>(initialLanguages ?? []);
+  const [machines, setMachines] = useState<{ id: number; name: string }[]>(initialMachines ?? []);
+  const [genreId, setGenreId] = useState<number | "">(
+    initialUrlState?.genreId === "" ? "" : initialUrlState?.genreId ? Number(initialUrlState.genreId) : ""
+  );
+  const [languageId, setLanguageId] = useState<string | "">(initialUrlState?.languageId ?? "");
+  const [machinetypeId, setMachinetypeId] = useState<number | "">(
+    initialUrlState?.machinetypeId === "" ? "" : initialUrlState?.machinetypeId ? Number(initialUrlState.machinetypeId) : ""
+  );
+  const [sort, setSort] = useState<"title" | "id_desc">(initialUrlState?.sort ?? "id_desc");
+
+  const pageSize = 20;
+  const totalPages = useMemo(() => (data ? Math.max(1, Math.ceil(data.total / data.pageSize)) : 1), [data]);
+
+  function updateUrl(nextPage = page) {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(nextPage));
+    if (genreId !== "") params.set("genreId", String(genreId));
+    if (languageId !== "") params.set("languageId", String(languageId));
+    if (machinetypeId !== "") params.set("machinetypeId", String(machinetypeId));
+    if (sort) params.set("sort", sort);
+    const qs = params.toString();
+    router.replace(qs ? `${pathname}?${qs}` : pathname);
+  }
+
+  async function fetchData(query: string, p: number) {
+    setLoading(true);
+    try {
+      const params = new URLSearchParams();
+      if (query) params.set("q", query);
+      params.set("page", String(p));
+      params.set("pageSize", String(pageSize));
+      if (genreId !== "") params.set("genreId", String(genreId));
+      if (languageId !== "") params.set("languageId", String(languageId));
+      if (machinetypeId !== "") params.set("machinetypeId", String(machinetypeId));
+      if (sort) params.set("sort", sort);
+      const res = await fetch(`/api/zxdb/search?${params.toString()}`);
+      if (!res.ok) throw new Error(`Failed: ${res.status}`);
+      const json: Paged<Item> = await res.json();
+      setData(json);
+    } catch (e) {
+      // eslint-disable-next-line no-console
+      console.error(e);
+      setData({ items: [], page: 1, pageSize, total: 0 });
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  // Sync from SSR payload on navigation
+  useEffect(() => {
+    if (initial) {
+      setData(initial);
+      setPage(initial.page);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [initial]);
+
+  // Client fetch when filters/paging/sort change; also keep URL in sync
+  useEffect(() => {
+    // Avoid extra fetch if SSR already matches this exact default state
+    const initialPage = initial?.page ?? 1;
+    if (
+      initial &&
+      page === initialPage &&
+      (initialUrlState?.q ?? "") === q &&
+      (initialUrlState?.genreId === "" ? "" : Number(initialUrlState?.genreId ?? "")) === (genreId === "" ? "" : Number(genreId)) &&
+      (initialUrlState?.languageId ?? "") === (languageId ?? "") &&
+      (initialUrlState?.machinetypeId === "" ? "" : Number(initialUrlState?.machinetypeId ?? "")) ===
+        (machinetypeId === "" ? "" : Number(machinetypeId)) &&
+      sort === (initialUrlState?.sort ?? "id_desc")
+    ) {
+      updateUrl(page);
+      return;
+    }
+    updateUrl(page);
+    fetchData(q, page);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [page, genreId, languageId, machinetypeId, sort]);
+
+  // Load filter lists on mount only if not provided by server
+  useEffect(() => {
+    if (initialGenres && initialLanguages && initialMachines) return;
+    async function loadLists() {
+      try {
+        const [g, l, m] = await Promise.all([
+          fetch("/api/zxdb/genres", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/languages", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/machinetypes", { cache: "force-cache" }).then((r) => r.json()),
+        ]);
+        setGenres(g.items ?? []);
+        setLanguages(l.items ?? []);
+        setMachines(m.items ?? []);
+      } catch {}
+    }
+    loadLists();
+  }, [initialGenres, initialLanguages, initialMachines]);
+
+  function onSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setPage(1);
+    updateUrl(1);
+    fetchData(q, 1);
+  }
+
+  const prevHref = useMemo(() => {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(Math.max(1, (data?.page ?? 1) - 1)));
+    if (genreId !== "") params.set("genreId", String(genreId));
+    if (languageId !== "") params.set("languageId", String(languageId));
+    if (machinetypeId !== "") params.set("machinetypeId", String(machinetypeId));
+    if (sort) params.set("sort", sort);
+    return `/zxdb/entries?${params.toString()}`;
+  }, [q, data?.page, genreId, languageId, machinetypeId, sort]);
+
+  const nextHref = useMemo(() => {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(Math.max(1, (data?.page ?? 1) + 1)));
+    if (genreId !== "") params.set("genreId", String(genreId));
+    if (languageId !== "") params.set("languageId", String(languageId));
+    if (machinetypeId !== "") params.set("machinetypeId", String(machinetypeId));
+    if (sort) params.set("sort", sort);
+    return `/zxdb/entries?${params.toString()}`;
+  }, [q, data?.page, genreId, languageId, machinetypeId, sort]);
+
+  return (
+    <div>
+      <h1 className="mb-3">Entries</h1>
+      <form className="row gy-2 gx-2 align-items-center" onSubmit={onSubmit}>
+        <div className="col-sm-8 col-md-6 col-lg-4">
+          <input
+            type="text"
+            className="form-control"
+            placeholder="Search titles..."
+            value={q}
+            onChange={(e) => setQ(e.target.value)}
+          />
+        </div>
+        <div className="col-auto">
+          <button className="btn btn-primary" type="submit" disabled={loading}>Search</button>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={genreId as any} onChange={(e) => { setGenreId(e.target.value === "" ? "" : Number(e.target.value)); setPage(1); }}>
+            <option value="">Genre</option>
+            {genres.map((g) => (
+              <option key={g.id} value={g.id}>{g.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={languageId as any} onChange={(e) => { setLanguageId(e.target.value); setPage(1); }}>
+            <option value="">Language</option>
+            {languages.map((l) => (
+              <option key={l.id} value={l.id}>{l.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={machinetypeId as any} onChange={(e) => { setMachinetypeId(e.target.value === "" ? "" : Number(e.target.value)); setPage(1); }}>
+            <option value="">Machine</option>
+            {machines.map((m) => (
+              <option key={m.id} value={m.id}>{m.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={sort} onChange={(e) => { setSort(e.target.value as any); setPage(1); }}>
+            <option value="title">Sort: Title</option>
+            <option value="id_desc">Sort: Newest</option>
+          </select>
+        </div>
+        {loading && (
+          <div className="col-auto text-secondary">Loading...</div>
+        )}
+      </form>
+
+      <div className="mt-3">
+        {data && data.items.length === 0 && !loading && (
+          <div className="alert alert-warning">No results.</div>
+        )}
+        {data && data.items.length > 0 && (
+          <div className="table-responsive">
+            <table className="table table-striped table-hover align-middle">
+              <thead>
+                <tr>
+                  <th style={{width: 80}}>ID</th>
+                  <th>Title</th>
+                  <th style={{width: 160}}>Machine</th>
+                  <th style={{width: 120}}>Language</th>
+                </tr>
+              </thead>
+              <tbody>
+                {data.items.map((it) => (
+                  <tr key={it.id}>
+                    <td>{it.id}</td>
+                    <td>
+                      <Link href={`/zxdb/entries/${it.id}`}>{it.title}</Link>
+                    </td>
+                    <td>
+                      {it.machinetypeId != null ? (
+                        it.machinetypeName ? (
+                          <Link href={`/zxdb/machinetypes/${it.machinetypeId}`}>{it.machinetypeName}</Link>
+                        ) : (
+                          <span>{it.machinetypeId}</span>
+                        )
+                      ) : (
+                        <span className="text-secondary">-</span>
+                      )}
+                    </td>
+                    <td>
+                      {it.languageId ? (
+                        it.languageName ? (
+                          <Link href={`/zxdb/languages/${it.languageId}`}>{it.languageName}</Link>
+                        ) : (
+                          <span>{it.languageId}</span>
+                        )
+                      ) : (
+                        <span className="text-secondary">-</span>
+                      )}
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+
+      <div className="d-flex align-items-center gap-2 mt-2">
+        <span>
+          Page {data?.page ?? 1} / {totalPages}
+        </span>
+        <div className="ms-auto d-flex gap-2">
+          <Link
+            className={`btn btn-outline-secondary ${!data || (data.page <= 1) ? "disabled" : ""}`}
+            aria-disabled={!data || data.page <= 1}
+            href={prevHref}
+            onClick={(e) => {
+              if (!data || data.page <= 1) return;
+              e.preventDefault();
+              setPage((p) => Math.max(1, p - 1));
+            }}
+          >
+            Prev
+          </Link>
+          <Link
+            className={`btn btn-outline-secondary ${!data || (data.page >= totalPages) ? "disabled" : ""}`}
+            aria-disabled={!data || data.page >= totalPages}
+            href={nextHref}
+            onClick={(e) => {
+              if (!data || data.page >= totalPages) return;
+              e.preventDefault();
+              setPage((p) => Math.min(totalPages, p + 1));
+            }}
+          >
+            Next
+          </Link>
+        </div>
+      </div>
+
+      <hr />
+      <div className="d-flex flex-wrap gap-2">
+        <Link className="btn btn-sm btn-outline-secondary" href="/zxdb/labels">Browse Labels</Link>
+        <Link className="btn btn-sm btn-outline-secondary" href="/zxdb/genres">Browse Genres</Link>
+        <Link className="btn btn-sm btn-outline-secondary" href="/zxdb/languages">Browse Languages</Link>
+        <Link className="btn btn-sm btn-outline-secondary" href="/zxdb/machinetypes">Browse Machines</Link>
+      </div>
+    </div>
+  );
+}

src/app/zxdb/entries/page.tsx

@@ -0,0 +1,43 @@
+import EntriesExplorer from "./EntriesExplorer";
+import { listGenres, listLanguages, listMachinetypes, searchEntries } from "@/server/repo/zxdb";
+
+export const metadata = {
+  title: "ZXDB Entries",
+};
+
+export const dynamic = "force-dynamic";
+
+export default async function Page({ searchParams }: { searchParams: Promise<{ [key: string]: string | string[] | undefined }> }) {
+  const sp = await searchParams;
+  const page = Math.max(1, Number(Array.isArray(sp.page) ? sp.page[0] : sp.page) || 1);
+  const genreId = (Array.isArray(sp.genreId) ? sp.genreId[0] : sp.genreId) ?? "";
+  const languageId = (Array.isArray(sp.languageId) ? sp.languageId[0] : sp.languageId) ?? "";
+  const machinetypeId = (Array.isArray(sp.machinetypeId) ? sp.machinetypeId[0] : sp.machinetypeId) ?? "";
+  const sort = ((Array.isArray(sp.sort) ? sp.sort[0] : sp.sort) as any) ?? "id_desc";
+  const q = (Array.isArray(sp.q) ? sp.q[0] : sp.q) ?? "";
+
+  const [initial, genres, langs, machines] = await Promise.all([
+    searchEntries({
+      page,
+      pageSize: 20,
+      sort,
+      q,
+      genreId: genreId ? Number(genreId) : undefined,
+      languageId: languageId || undefined,
+      machinetypeId: machinetypeId ? Number(machinetypeId) : undefined,
+    }),
+    listGenres(),
+    listLanguages(),
+    listMachinetypes(),
+  ]);
+
+  return (
+    <EntriesExplorer
+      initial={initial as any}
+      initialGenres={genres as any}
+      initialLanguages={langs as any}
+      initialMachines={machines as any}
+      initialUrlState={{ q, page, genreId, languageId, machinetypeId, sort }}
+    />
+  );
+}

src/app/zxdb/page.tsx

@@ -1,30 +1,60 @@
-import ZxdbExplorer from "./ZxdbExplorer";
-import { searchEntries, listGenres, listLanguages, listMachinetypes } from "@/server/repo/zxdb";
+import Link from "next/link";
 
 export const metadata = {
   title: "ZXDB Explorer",
 };
 
-// This page depends on searchParams (?page=, filters in future). Force dynamic
-// rendering so ISR doesn’t cache a single HTML for all query strings.
-export const dynamic = "force-dynamic";
+export const revalidate = 3600;
 
-export default async function Page({ searchParams }: { searchParams: Promise<{ [key: string]: string | string[] | undefined }> }) {
-  const sp = await searchParams;
-  const page = Math.max(1, Number(Array.isArray(sp.page) ? sp.page[0] : sp.page) || 1);
-  // Server-render initial page based on URL to avoid first client fetch and keep counter in sync
-  const [initial, genres, langs, machines] = await Promise.all([
-    searchEntries({ page, pageSize: 20, sort: "id_desc" }),
-    listGenres(),
-    listLanguages(),
-    listMachinetypes(),
-  ]);
+export default async function Page() {
   return (
-    <ZxdbExplorer
-      initial={initial as any}
-      initialGenres={genres as any}
-      initialLanguages={langs as any}
-      initialMachines={machines as any}
-    />
+    <div>
+      <h1 className="mb-3">ZXDB Explorer</h1>
+      <p className="text-secondary">Choose what you want to explore.</p>
+
+      <div className="row g-3">
+        <div className="col-sm-6 col-lg-4">
+          <Link href="/zxdb/entries" className="text-decoration-none">
+            <div className="card h-100 shadow-sm">
+              <div className="card-body d-flex align-items-center">
+                <div className="me-3" aria-hidden>
+                  <span className="bi bi-collection" style={{ fontSize: 28 }} />
+                </div>
+                <div>
+                  <h5 className="card-title mb-1">Entries</h5>
+                  <div className="card-text text-secondary">Browse software entries with filters</div>
+                </div>
+              </div>
+            </div>
+          </Link>
+        </div>
+
+        <div className="col-sm-6 col-lg-4">
+          <Link href="/zxdb/releases" className="text-decoration-none">
+            <div className="card h-100 shadow-sm">
+              <div className="card-body d-flex align-items-center">
+                <div className="me-3" aria-hidden>
+                  <span className="bi bi-box-arrow-down" style={{ fontSize: 28 }} />
+                </div>
+                <div>
+                  <h5 className="card-title mb-1">Releases</h5>
+                  <div className="card-text text-secondary">Drill into releases and downloads</div>
+                </div>
+              </div>
+            </div>
+          </Link>
+        </div>
+      </div>
+
+      <div className="mt-4">
+        <h2 className="h5 mb-2">Categories</h2>
+        <div className="d-flex flex-wrap gap-2">
+          <Link className="btn btn-outline-secondary btn-sm" href="/zxdb/genres">Genres</Link>
+          <Link className="btn btn-outline-secondary btn-sm" href="/zxdb/languages">Languages</Link>
+          <Link className="btn btn-outline-secondary btn-sm" href="/zxdb/machinetypes">Machine Types</Link>
+          <Link className="btn btn-outline-secondary btn-sm" href="/zxdb/labels">Labels</Link>
+        </div>
+      </div>
+    </div>
   );
 }

src/app/zxdb/releases/ReleasesExplorer.tsx

@@ -0,0 +1,366 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import Link from "next/link";
+import { usePathname, useRouter } from "next/navigation";
+
+type Item = {
+  entryId: number;
+  releaseSeq: number;
+  entryTitle: string;
+  year: number | null;
+};
+
+type Paged<T> = {
+  items: T[];
+  page: number;
+  pageSize: number;
+  total: number;
+};
+
+export default function ReleasesExplorer({
+  initial,
+  initialUrlState,
+}: {
+  initial?: Paged<Item>;
+  initialUrlState?: {
+    q: string;
+    page: number;
+    year: string;
+    sort: "year_desc" | "year_asc" | "title" | "entry_id_desc";
+    dLanguageId?: string;
+    dMachinetypeId?: string; // keep as string for URL/state consistency
+    filetypeId?: string;
+    schemetypeId?: string;
+    sourcetypeId?: string;
+    casetypeId?: string;
+    isDemo?: string; // "1" or "true"
+  };
+}) {
+  const router = useRouter();
+  const pathname = usePathname();
+
+  const [q, setQ] = useState(initialUrlState?.q ?? "");
+  const [page, setPage] = useState(initial?.page ?? initialUrlState?.page ?? 1);
+  const [loading, setLoading] = useState(false);
+  const [data, setData] = useState<Paged<Item> | null>(initial ?? null);
+  const [year, setYear] = useState<string>(initialUrlState?.year ?? "");
+  const [sort, setSort] = useState<"year_desc" | "year_asc" | "title" | "entry_id_desc">(initialUrlState?.sort ?? "year_desc");
+
+  // Download-based filters and their option lists
+  const [dLanguageId, setDLanguageId] = useState<string>(initialUrlState?.dLanguageId ?? "");
+  const [dMachinetypeId, setDMachinetypeId] = useState<string>(initialUrlState?.dMachinetypeId ?? "");
+  const [filetypeId, setFiletypeId] = useState<string>(initialUrlState?.filetypeId ?? "");
+  const [schemetypeId, setSchemetypeId] = useState<string>(initialUrlState?.schemetypeId ?? "");
+  const [sourcetypeId, setSourcetypeId] = useState<string>(initialUrlState?.sourcetypeId ?? "");
+  const [casetypeId, setCasetypeId] = useState<string>(initialUrlState?.casetypeId ?? "");
+  const [isDemo, setIsDemo] = useState<boolean>(!!(initialUrlState?.isDemo && (initialUrlState.isDemo === "1" || initialUrlState.isDemo === "true")));
+
+  const [langs, setLangs] = useState<{ id: string; name: string }[]>([]);
+  const [machines, setMachines] = useState<{ id: number; name: string }[]>([]);
+  const [filetypes, setFiletypes] = useState<{ id: number; name: string }[]>([]);
+  const [schemes, setSchemes] = useState<{ id: string; name: string }[]>([]);
+  const [sources, setSources] = useState<{ id: string; name: string }[]>([]);
+  const [cases, setCases] = useState<{ id: string; name: string }[]>([]);
+
+  const pageSize = 20;
+  const totalPages = useMemo(() => (data ? Math.max(1, Math.ceil(data.total / data.pageSize)) : 1), [data]);
+
+  function updateUrl(nextPage = page) {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(nextPage));
+    if (year) params.set("year", year);
+    if (sort) params.set("sort", sort);
+    if (dLanguageId) params.set("dLanguageId", dLanguageId);
+    if (dMachinetypeId) params.set("dMachinetypeId", dMachinetypeId);
+    if (filetypeId) params.set("filetypeId", filetypeId);
+    if (schemetypeId) params.set("schemetypeId", schemetypeId);
+    if (sourcetypeId) params.set("sourcetypeId", sourcetypeId);
+    if (casetypeId) params.set("casetypeId", casetypeId);
+    if (isDemo) params.set("isDemo", "1");
+    const qs = params.toString();
+    router.replace(qs ? `${pathname}?${qs}` : pathname);
+  }
+
+  async function fetchData(query: string, p: number) {
+    setLoading(true);
+    try {
+      const params = new URLSearchParams();
+      if (query) params.set("q", query);
+      params.set("page", String(p));
+      params.set("pageSize", String(pageSize));
+      if (year) params.set("year", String(Number(year)));
+      if (sort) params.set("sort", sort);
+      if (dLanguageId) params.set("dLanguageId", dLanguageId);
+      if (dMachinetypeId) params.set("dMachinetypeId", dMachinetypeId);
+      if (filetypeId) params.set("filetypeId", filetypeId);
+      if (schemetypeId) params.set("schemetypeId", schemetypeId);
+      if (sourcetypeId) params.set("sourcetypeId", sourcetypeId);
+      if (casetypeId) params.set("casetypeId", casetypeId);
+      if (isDemo) params.set("isDemo", "1");
+      const res = await fetch(`/api/zxdb/releases/search?${params.toString()}`);
+      if (!res.ok) throw new Error(`Failed: ${res.status}`);
+      const json: Paged<Item> = await res.json();
+      setData(json);
+    } catch (e) {
+      // eslint-disable-next-line no-console
+      console.error(e);
+      setData({ items: [], page: 1, pageSize, total: 0 });
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  useEffect(() => {
+    if (initial) {
+      setData(initial);
+      setPage(initial.page);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [initial]);
+
+  useEffect(() => {
+    const initialPage = initial?.page ?? 1;
+    if (
+      initial &&
+      page === initialPage &&
+      (initialUrlState?.q ?? "") === q &&
+      (initialUrlState?.year ?? "") === (year ?? "") &&
+      sort === (initialUrlState?.sort ?? "year_desc") &&
+      (initialUrlState?.dLanguageId ?? "") === dLanguageId &&
+      (initialUrlState?.dMachinetypeId ?? "") === dMachinetypeId &&
+      (initialUrlState?.filetypeId ?? "") === filetypeId &&
+      (initialUrlState?.schemetypeId ?? "") === schemetypeId &&
+      (initialUrlState?.sourcetypeId ?? "") === sourcetypeId &&
+      (initialUrlState?.casetypeId ?? "") === casetypeId &&
+      (!!initialUrlState?.isDemo === isDemo)
+    ) {
+      updateUrl(page);
+      return;
+    }
+    updateUrl(page);
+    fetchData(q, page);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [page, year, sort, dLanguageId, dMachinetypeId, filetypeId, schemetypeId, sourcetypeId, casetypeId, isDemo]);
+
+  function onSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setPage(1);
+    updateUrl(1);
+    fetchData(q, 1);
+  }
+
+  // Load filter option lists on mount
+  useEffect(() => {
+    async function loadLists() {
+      try {
+        const [l, m, ft, sc, so, ca] = await Promise.all([
+          fetch("/api/zxdb/languages", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/machinetypes", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/filetypes", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/schemetypes", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/sourcetypes", { cache: "force-cache" }).then((r) => r.json()),
+          fetch("/api/zxdb/casetypes", { cache: "force-cache" }).then((r) => r.json()),
+        ]);
+        setLangs(l.items ?? []);
+        setMachines(m.items ?? []);
+        setFiletypes(ft.items ?? []);
+        setSchemes(sc.items ?? []);
+        setSources(so.items ?? []);
+        setCases(ca.items ?? []);
+      } catch {
+        // ignore
+      }
+    }
+    loadLists();
+  }, []);
+
+  const prevHref = useMemo(() => {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(Math.max(1, (data?.page ?? 1) - 1)));
+    if (year) params.set("year", year);
+    if (sort) params.set("sort", sort);
+    if (dLanguageId) params.set("dLanguageId", dLanguageId);
+    if (dMachinetypeId) params.set("dMachinetypeId", dMachinetypeId);
+    if (filetypeId) params.set("filetypeId", filetypeId);
+    if (schemetypeId) params.set("schemetypeId", schemetypeId);
+    if (sourcetypeId) params.set("sourcetypeId", sourcetypeId);
+    if (casetypeId) params.set("casetypeId", casetypeId);
+    if (isDemo) params.set("isDemo", "1");
+    return `/zxdb/releases?${params.toString()}`;
+  }, [q, data?.page, year, sort, dLanguageId, dMachinetypeId, filetypeId, schemetypeId, sourcetypeId, casetypeId, isDemo]);
+
+  const nextHref = useMemo(() => {
+    const params = new URLSearchParams();
+    if (q) params.set("q", q);
+    params.set("page", String(Math.max(1, (data?.page ?? 1) + 1)));
+    if (year) params.set("year", year);
+    if (sort) params.set("sort", sort);
+    if (dLanguageId) params.set("dLanguageId", dLanguageId);
+    if (dMachinetypeId) params.set("dMachinetypeId", dMachinetypeId);
+    if (filetypeId) params.set("filetypeId", filetypeId);
+    if (schemetypeId) params.set("schemetypeId", schemetypeId);
+    if (sourcetypeId) params.set("sourcetypeId", sourcetypeId);
+    if (casetypeId) params.set("casetypeId", casetypeId);
+    if (isDemo) params.set("isDemo", "1");
+    return `/zxdb/releases?${params.toString()}`;
+  }, [q, data?.page, year, sort, dLanguageId, dMachinetypeId, filetypeId, schemetypeId, sourcetypeId, casetypeId, isDemo]);
+
+  return (
+    <div>
+      <h1 className="mb-3">Releases</h1>
+      <form className="row gy-2 gx-2 align-items-center" onSubmit={onSubmit}>
+        <div className="col-sm-8 col-md-6 col-lg-4">
+          <input
+            type="text"
+            className="form-control"
+            placeholder="Filter by entry title..."
+            value={q}
+            onChange={(e) => setQ(e.target.value)}
+          />
+        </div>
+        <div className="col-auto">
+          <button className="btn btn-primary" type="submit" disabled={loading}>Search</button>
+        </div>
+        <div className="col-auto">
+          <input
+            type="number"
+            className="form-control"
+            placeholder="Year"
+            value={year}
+            onChange={(e) => { setYear(e.target.value); setPage(1); }}
+          />
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={dLanguageId} onChange={(e) => { setDLanguageId(e.target.value); setPage(1); }}>
+            <option value="">DL Language</option>
+            {langs.map((l) => (
+              <option key={l.id} value={l.id}>{l.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={dMachinetypeId} onChange={(e) => { setDMachinetypeId(e.target.value); setPage(1); }}>
+            <option value="">DL Machine</option>
+            {machines.map((m) => (
+              <option key={m.id} value={m.id}>{m.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={filetypeId} onChange={(e) => { setFiletypeId(e.target.value); setPage(1); }}>
+            <option value="">File type</option>
+            {filetypes.map((ft) => (
+              <option key={ft.id} value={ft.id}>{ft.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={schemetypeId} onChange={(e) => { setSchemetypeId(e.target.value); setPage(1); }}>
+            <option value="">Scheme</option>
+            {schemes.map((s) => (
+              <option key={s.id} value={s.id}>{s.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={sourcetypeId} onChange={(e) => { setSourcetypeId(e.target.value); setPage(1); }}>
+            <option value="">Source</option>
+            {sources.map((s) => (
+              <option key={s.id} value={s.id}>{s.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={casetypeId} onChange={(e) => { setCasetypeId(e.target.value); setPage(1); }}>
+            <option value="">Case</option>
+            {cases.map((c) => (
+              <option key={c.id} value={c.id}>{c.name}</option>
+            ))}
+          </select>
+        </div>
+        <div className="col-auto form-check ms-2">
+          <input id="demoCheck" className="form-check-input" type="checkbox" checked={isDemo} onChange={(e) => { setIsDemo(e.target.checked); setPage(1); }} />
+          <label className="form-check-label" htmlFor="demoCheck">Demo only</label>
+        </div>
+        <div className="col-auto">
+          <select className="form-select" value={sort} onChange={(e) => { setSort(e.target.value as any); setPage(1); }}>
+            <option value="year_desc">Sort: Newest</option>
+            <option value="year_asc">Sort: Oldest</option>
+            <option value="title">Sort: Title</option>
+            <option value="entry_id_desc">Sort: Entry ID</option>
+          </select>
+        </div>
+        {loading && (
+          <div className="col-auto text-secondary">Loading...</div>
+        )}
+      </form>
+
+      <div className="mt-3">
+        {data && data.items.length === 0 && !loading && (
+          <div className="alert alert-warning">No results.</div>
+        )}
+        {data && data.items.length > 0 && (
+          <div className="table-responsive">
+            <table className="table table-striped table-hover align-middle">
+              <thead>
+                <tr>
+                  <th style={{width: 80}}>Entry ID</th>
+                  <th>Title</th>
+                  <th style={{width: 110}}>Release #</th>
+                  <th style={{width: 100}}>Year</th>
+                </tr>
+              </thead>
+              <tbody>
+                {data.items.map((it) => (
+                  <tr key={`${it.entryId}-${it.releaseSeq}`}>
+                    <td>{it.entryId}</td>
+                    <td>
+                      <Link href={`/zxdb/entries/${it.entryId}`}>{it.entryTitle}</Link>
+                    </td>
+                    <td>#{it.releaseSeq}</td>
+                    <td>{it.year ?? <span className="text-secondary">-</span>}</td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+
+      <div className="d-flex align-items-center gap-2 mt-2">
+        <span>
+          Page {data?.page ?? 1} / {totalPages}
+        </span>
+        <div className="ms-auto d-flex gap-2">
+          <Link
+            className={`btn btn-outline-secondary ${!data || (data.page <= 1) ? "disabled" : ""}`}
+            aria-disabled={!data || data.page <= 1}
+            href={prevHref}
+            onClick={(e) => {
+              if (!data || data.page <= 1) return;
+              e.preventDefault();
+              setPage((p) => Math.max(1, p - 1));
+            }}
+          >
+            Prev
+          </Link>
+          <Link
+            className={`btn btn-outline-secondary ${!data || (data.page >= totalPages) ? "disabled" : ""}`}
+            aria-disabled={!data || data.page >= totalPages}
+            href={nextHref}
+            onClick={(e) => {
+              if (!data || data.page >= totalPages) return;
+              e.preventDefault();
+              setPage((p) => Math.min(totalPages, p + 1));
+            }}
+          >
+            Next
+          </Link>
+        </div>
+      </div>
+    </div>
+  );
+}

src/app/zxdb/releases/page.tsx

@@ -0,0 +1,41 @@
+import ReleasesExplorer from "./ReleasesExplorer";
+import { searchReleases } from "@/server/repo/zxdb";
+
+export const metadata = {
+  title: "ZXDB Releases",
+};
+
+export const dynamic = "force-dynamic";
+
+export default async function Page({ searchParams }: { searchParams: Promise<{ [key: string]: string | string[] | undefined }> }) {
+  const sp = await searchParams;
+  const page = Math.max(1, Number(Array.isArray(sp.page) ? sp.page[0] : sp.page) || 1);
+  const q = (Array.isArray(sp.q) ? sp.q[0] : sp.q) ?? "";
+  const yearStr = (Array.isArray(sp.year) ? sp.year[0] : sp.year) ?? "";
+  const year = yearStr ? Number(yearStr) : undefined;
+  const sort = ((Array.isArray(sp.sort) ? sp.sort[0] : sp.sort) as any) ?? "year_desc";
+  const dLanguageId = (Array.isArray(sp.dLanguageId) ? sp.dLanguageId[0] : sp.dLanguageId) ?? "";
+  const dMachinetypeIdStr = (Array.isArray(sp.dMachinetypeId) ? sp.dMachinetypeId[0] : sp.dMachinetypeId) ?? "";
+  const dMachinetypeId = dMachinetypeIdStr ? Number(dMachinetypeIdStr) : undefined;
+  const filetypeIdStr = (Array.isArray(sp.filetypeId) ? sp.filetypeId[0] : sp.filetypeId) ?? "";
+  const filetypeId = filetypeIdStr ? Number(filetypeIdStr) : undefined;
+  const schemetypeId = (Array.isArray(sp.schemetypeId) ? sp.schemetypeId[0] : sp.schemetypeId) ?? "";
+  const sourcetypeId = (Array.isArray(sp.sourcetypeId) ? sp.sourcetypeId[0] : sp.sourcetypeId) ?? "";
+  const casetypeId = (Array.isArray(sp.casetypeId) ? sp.casetypeId[0] : sp.casetypeId) ?? "";
+  const isDemoStr = (Array.isArray(sp.isDemo) ? sp.isDemo[0] : sp.isDemo) ?? "";
+  const isDemo = isDemoStr ? (isDemoStr === "true" || isDemoStr === "1") : undefined;
+
+  const [initial] = await Promise.all([
+    searchReleases({ page, pageSize: 20, q, year, sort, dLanguageId: dLanguageId || undefined, dMachinetypeId, filetypeId, schemetypeId: schemetypeId || undefined, sourcetypeId: sourcetypeId || undefined, casetypeId: casetypeId || undefined, isDemo }),
+  ]);
+
+  // Ensure the object passed to a Client Component is a plain JSON value
+  const initialPlain = JSON.parse(JSON.stringify(initial));
+
+  return (
+    <ReleasesExplorer
+      initial={initialPlain as any}
+      initialUrlState={{ q, page, year: yearStr, sort, dLanguageId, dMachinetypeId: dMachinetypeIdStr, filetypeId: filetypeIdStr, schemetypeId, sourcetypeId, casetypeId, isDemo: isDemoStr }}
+    />
+  );
+}