Implement band/artist management with version history

Full CRUD for bands and artists: UUID + slug URLs, dynamic link
editor, band-artist associations with roles, per-edit revision
snapshots (message + IP). Add README and CLAUDE.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

11 files changed, 1163 insertions, 3 deletions

diff --git a/app/routes/artist-by-slug.tsx b/app/routes/artist-by-slug.tsx
new file mode 100644
index 0000000..5b38df2
--- /dev/null
+++ b/app/routes/artist-by-slug.tsx
@@ -0,0 +1,13 @@
+import { data, redirect } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import { getArtistBySlug } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const artist = getArtistBySlug(params.slug!);
+  if (!artist) throw data("Not found", { status: 404 });
+  return redirect(`/artists/of/${artist.id}`);
+}
+
+export default function ArtistBySlug() {
+  return null;
+}
diff --git a/app/routes/artist-by-uuid.tsx b/app/routes/artist-by-uuid.tsx
new file mode 100644
index 0000000..9b8a4b1
--- /dev/null
+++ b/app/routes/artist-by-uuid.tsx
@@ -0,0 +1,100 @@
+import { data, Link, useLoaderData } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import { getArtistBands, getArtistById, getArtistLinks, getArtistRevisions } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const artist = getArtistById(params.uuid!);
+  if (!artist) throw data("Not found", { status: 404 });
+  const links = getArtistLinks(artist.id);
+  const bands = getArtistBands(artist.id);
+  const revisions = getArtistRevisions(artist.id);
+  return { artist, links, bands, latest: revisions[0] ?? null };
+}
+
+export default function ArtistDetail() {
+  const { artist, links, bands, latest } = useLoaderData<typeof loader>();
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-start justify-between mb-6">
+        <h1 className="text-2xl font-bold">{artist.name}</h1>
+        <div className="flex items-center gap-3 text-sm shrink-0 ml-4">
+          <Link
+            to={`/artists/of/${artist.id}/history`}
+            className="text-gray-400 hover:text-gray-200 transition-colors"
+          >
+            履歴
+          </Link>
+          <Link
+            to={`/artists/of/${artist.id}/edit`}
+            className="bg-gray-800 hover:bg-gray-700 text-gray-200 px-3 py-1.5 rounded transition-colors"
+          >
+            編集
+          </Link>
+        </div>
+      </div>
+
+      {bands.length > 0 && (
+        <section className="mb-6">
+          <h2 className="text-xs font-medium text-gray-500 uppercase tracking-wider mb-3">
+            バンド
+          </h2>
+          <ul className="space-y-2">
+            {bands.map((b) => (
+              <li key={b.band_id} className="flex items-center gap-3">
+                <Link
+                  to={`/bands/of/${b.band_id}`}
+                  className="text-blue-400 hover:text-blue-300 transition-colors font-medium"
+                >
+                  {b.band_name}
+                </Link>
+                {b.role && (
+                  <span className="text-gray-400 text-sm">{b.role}</span>
+                )}
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+
+      {links.length > 0 && (
+        <section className="mb-6">
+          <h2 className="text-xs font-medium text-gray-500 uppercase tracking-wider mb-3">
+            リンク
+          </h2>
+          <ul className="space-y-1.5">
+            {links.map((l) => (
+              <li key={l.id}>
+                <a
+                  href={l.url}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-blue-400 hover:text-blue-300 transition-colors text-sm"
+                >
+                  {l.label}
+                </a>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+
+      <hr className="border-gray-800 my-6" />
+      <div className="text-xs text-gray-600 space-y-1 font-mono">
+        <p>/artists/of/{artist.id}</p>
+        <p>
+          <Link
+            to={`/artists/named/${artist.slug}`}
+            className="hover:text-gray-400 transition-colors"
+          >
+            /artists/named/{artist.slug}
+          </Link>
+        </p>
+        {latest && (
+          <p className="font-sans text-gray-500 mt-2">
+            最終更新: {latest.created_at} — {latest.message}
+          </p>
+        )}
+      </div>
+    </main>
+  );
+}
diff --git a/app/routes/artist-edit.tsx b/app/routes/artist-edit.tsx
new file mode 100644
index 0000000..f2e5c18
--- /dev/null
+++ b/app/routes/artist-edit.tsx
@@ -0,0 +1,165 @@
+import { useState } from "react";
+import { data, Form, Link, redirect, useActionData, useLoaderData } from "react-router";
+import type { ActionFunctionArgs, LoaderFunctionArgs } from "react-router";
+import { getArtistById, getArtistLinks, getIpAddress, updateArtist } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const artist = getArtistById(params.uuid!);
+  if (!artist) throw data("Not found", { status: 404 });
+  const links = getArtistLinks(artist.id);
+  return { artist, links };
+}
+
+export async function action({ params, request }: ActionFunctionArgs) {
+  const artist = getArtistById(params.uuid!);
+  if (!artist) throw data("Not found", { status: 404 });
+
+  const fd = await request.formData();
+  const name = (fd.get("name") as string).trim();
+  const slug = (fd.get("slug") as string).trim();
+  const message = (fd.get("message") as string).trim();
+  const links: { label: string; url: string }[] = JSON.parse(
+    (fd.get("links") as string) || "[]"
+  );
+
+  const errors: Record<string, string> = {};
+  if (!name) errors.name = "必須です";
+  if (!slug) errors.slug = "必須です";
+  if (!message) errors.message = "必須です";
+  if (Object.keys(errors).length > 0) return { errors };
+
+  try {
+    updateArtist(artist.id, { slug, name, links, message, ip_address: getIpAddress(request) });
+  } catch (e) {
+    if (e instanceof Error && e.message.includes("UNIQUE constraint failed: artists.slug")) {
+      return { errors: { slug: "このslugは既に使用されています" } };
+    }
+    throw e;
+  }
+  return redirect(`/artists/of/${artist.id}`);
+}
+
+function toSlug(s: string) {
+  return s.trim().toLowerCase().replace(/\s+/g, "-").replace(/[^\w぀-ヿ一-鿿＀-￯-]/g, "").replace(/^-+|-+$/g, "");
+}
+
+export default function ArtistEdit() {
+  const { artist, links: initLinks } = useLoaderData<typeof loader>();
+  const actionData = useActionData<typeof action>();
+  const errors = actionData?.errors ?? {};
+
+  const [name, setName] = useState(artist.name);
+  const [slug, setSlug] = useState(artist.slug);
+  const [slugManual, setSlugManual] = useState(true);
+  const [links, setLinks] = useState(initLinks.map((l) => ({ label: l.label, url: l.url })));
+
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link
+          to={`/artists/of/${artist.id}`}
+          className="text-gray-400 hover:text-gray-200 transition-colors"
+        >
+          ←
+        </Link>
+        <h1 className="text-xl font-semibold">Edit Artist</h1>
+      </div>
+
+      <Form method="post" className="space-y-5">
+        <input type="hidden" name="links" value={JSON.stringify(links)} />
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            名前 <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="name"
+            value={name}
+            onChange={(e) => {
+              setName(e.target.value);
+              if (!slugManual) setSlug(toSlug(e.target.value));
+            }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.name && <p className="text-red-400 text-sm mt-1">{errors.name}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            Slug <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="slug"
+            value={slug}
+            onChange={(e) => { setSlugManual(true); setSlug(e.target.value); }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 font-mono text-sm"
+          />
+          {errors.slug && <p className="text-red-400 text-sm mt-1">{errors.slug}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">リンク</label>
+          <div className="space-y-2">
+            {links.map((link, i) => (
+              <div key={i} className="flex gap-2">
+                <input
+                  value={link.label}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, label: e.target.value } : l))}
+                  placeholder="ラベル (例: X)"
+                  className="w-28 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <input
+                  value={link.url}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, url: e.target.value } : l))}
+                  placeholder="https://..."
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setLinks(links.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          <button
+            type="button"
+            onClick={() => setLinks([...links, { label: "", url: "" }])}
+            className="mt-2 text-blue-400 hover:text-blue-300 text-sm transition-colors"
+          >
+            + リンクを追加
+          </button>
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            更新メッセージ <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="message"
+            placeholder="例: SNSリンク追加"
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.message && <p className="text-red-400 text-sm mt-1">{errors.message}</p>}
+        </div>
+
+        <div className="flex gap-3 pt-2">
+          <button
+            type="submit"
+            className="bg-blue-600 hover:bg-blue-500 text-white px-4 py-2 rounded font-medium transition-colors"
+          >
+            保存
+          </button>
+          <Link
+            to={`/artists/of/${artist.id}`}
+            className="bg-gray-800 hover:bg-gray-700 text-gray-300 px-4 py-2 rounded transition-colors"
+          >
+            キャンセル
+          </Link>
+        </div>
+      </Form>
+    </main>
+  );
+}
diff --git a/app/routes/artist-history.tsx b/app/routes/artist-history.tsx
new file mode 100644
index 0000000..c2fb4cb
--- /dev/null
+++ b/app/routes/artist-history.tsx
@@ -0,0 +1,57 @@
+import { data, Link, useLoaderData } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import { getArtistById, getArtistRevisions } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const artist = getArtistById(params.uuid!);
+  if (!artist) throw data("Not found", { status: 404 });
+  const revisions = getArtistRevisions(artist.id);
+  return { artist, revisions };
+}
+
+export default function ArtistHistory() {
+  const { artist, revisions } = useLoaderData<typeof loader>();
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link
+          to={`/artists/of/${artist.id}`}
+          className="text-gray-400 hover:text-gray-200 transition-colors"
+        >
+          ←
+        </Link>
+        <h1 className="text-xl font-semibold">{artist.name} — 編集履歴</h1>
+      </div>
+
+      {revisions.length === 0 ? (
+        <p className="text-gray-400">履歴がありません。</p>
+      ) : (
+        <ol className="space-y-4">
+          {revisions.map((rev, i) => {
+            let snap: { name?: string; links?: unknown[] } = {};
+            try { snap = JSON.parse(rev.snapshot); } catch { /* ignore */ }
+            return (
+              <li key={rev.id} className="bg-gray-900 rounded-lg p-4">
+                <div className="flex items-start justify-between gap-4">
+                  <div className="flex-1 min-w-0">
+                    <p className="font-medium text-gray-100 truncate">{rev.message}</p>
+                    <p className="text-xs text-gray-500 mt-1">
+                      {rev.created_at} · {rev.ip_address}
+                    </p>
+                  </div>
+                  {i === 0 && (
+                    <span className="text-xs text-blue-400 shrink-0">最新</span>
+                  )}
+                </div>
+                <div className="mt-3 text-xs text-gray-400 space-y-0.5">
+                  <p>名前: {snap.name ?? "—"}</p>
+                  <p>リンク: {snap.links?.length ?? 0}件</p>
+                </div>
+              </li>
+            );
+          })}
+        </ol>
+      )}
+    </main>
+  );
+}
diff --git a/app/routes/artist-new.tsx b/app/routes/artist-new.tsx
new file mode 100644
index 0000000..168a7cc
--- /dev/null
+++ b/app/routes/artist-new.tsx
@@ -0,0 +1,150 @@
+import { useState } from "react";
+import { Form, Link, redirect, useActionData } from "react-router";
+import type { ActionFunctionArgs } from "react-router";
+import { createArtist, getIpAddress } from "~/lib/db.server";
+
+export async function action({ request }: ActionFunctionArgs) {
+  const fd = await request.formData();
+  const name = (fd.get("name") as string).trim();
+  const slug = (fd.get("slug") as string).trim();
+  const message = (fd.get("message") as string).trim();
+  const links: { label: string; url: string }[] = JSON.parse(
+    (fd.get("links") as string) || "[]"
+  );
+
+  const errors: Record<string, string> = {};
+  if (!name) errors.name = "必須です";
+  if (!slug) errors.slug = "必須です";
+  if (!message) errors.message = "必須です";
+  if (Object.keys(errors).length > 0) return { errors };
+
+  const id = crypto.randomUUID();
+  try {
+    createArtist({ id, slug, name, links, message, ip_address: getIpAddress(request) });
+  } catch (e) {
+    if (e instanceof Error && e.message.includes("UNIQUE constraint failed: artists.slug")) {
+      return { errors: { slug: "このslugは既に使用されています" } };
+    }
+    throw e;
+  }
+  return redirect(`/artists/of/${id}`);
+}
+
+function toSlug(s: string) {
+  return s.trim().toLowerCase().replace(/\s+/g, "-").replace(/[^\w぀-ヿ一-鿿＀-￯-]/g, "").replace(/^-+|-+$/g, "");
+}
+
+export default function ArtistNew() {
+  const actionData = useActionData<typeof action>();
+  const errors = actionData?.errors ?? {};
+
+  const [name, setName] = useState("");
+  const [slug, setSlug] = useState("");
+  const [slugManual, setSlugManual] = useState(false);
+  const [links, setLinks] = useState<{ label: string; url: string }[]>([]);
+
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link to="/" className="text-gray-400 hover:text-gray-200 transition-colors">←</Link>
+        <h1 className="text-xl font-semibold">New Artist</h1>
+      </div>
+
+      <Form method="post" className="space-y-5">
+        <input type="hidden" name="links" value={JSON.stringify(links)} />
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            名前 <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="name"
+            value={name}
+            onChange={(e) => {
+              setName(e.target.value);
+              if (!slugManual) setSlug(toSlug(e.target.value));
+            }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.name && <p className="text-red-400 text-sm mt-1">{errors.name}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            Slug <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="slug"
+            value={slug}
+            onChange={(e) => { setSlugManual(true); setSlug(e.target.value); }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 font-mono text-sm"
+          />
+          {errors.slug && <p className="text-red-400 text-sm mt-1">{errors.slug}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">リンク</label>
+          <div className="space-y-2">
+            {links.map((link, i) => (
+              <div key={i} className="flex gap-2">
+                <input
+                  value={link.label}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, label: e.target.value } : l))}
+                  placeholder="ラベル (例: X)"
+                  className="w-28 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <input
+                  value={link.url}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, url: e.target.value } : l))}
+                  placeholder="https://..."
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setLinks(links.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          <button
+            type="button"
+            onClick={() => setLinks([...links, { label: "", url: "" }])}
+            className="mt-2 text-blue-400 hover:text-blue-300 text-sm transition-colors"
+          >
+            + リンクを追加
+          </button>
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            更新メッセージ <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="message"
+            placeholder="例: 初回登録"
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.message && <p className="text-red-400 text-sm mt-1">{errors.message}</p>}
+        </div>
+
+        <div className="flex gap-3 pt-2">
+          <button
+            type="submit"
+            className="bg-blue-600 hover:bg-blue-500 text-white px-4 py-2 rounded font-medium transition-colors"
+          >
+            作成
+          </button>
+          <Link
+            to="/"
+            className="bg-gray-800 hover:bg-gray-700 text-gray-300 px-4 py-2 rounded transition-colors"
+          >
+            キャンセル
+          </Link>
+        </div>
+      </Form>
+    </main>
+  );
+}
diff --git a/app/routes/band-by-slug.tsx b/app/routes/band-by-slug.tsx
new file mode 100644
index 0000000..9b432bf
--- /dev/null
+++ b/app/routes/band-by-slug.tsx
@@ -0,0 +1,13 @@
+import { data, redirect } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import { getBandBySlug } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const band = getBandBySlug(params.slug!);
+  if (!band) throw data("Not found", { status: 404 });
+  return redirect(`/bands/of/${band.id}`);
+}
+
+export default function BandBySlug() {
+  return null;
+}
diff --git a/app/routes/band-by-uuid.tsx b/app/routes/band-by-uuid.tsx
new file mode 100644
index 0000000..c55472e
--- /dev/null
+++ b/app/routes/band-by-uuid.tsx
@@ -0,0 +1,108 @@
+import { data, Link, useLoaderData } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import {
+  getBandById,
+  getBandLinks,
+  getBandArtists,
+  getBandRevisions,
+} from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const band = getBandById(params.uuid!);
+  if (!band) throw data("Not found", { status: 404 });
+  const links = getBandLinks(band.id);
+  const artists = getBandArtists(band.id);
+  const revisions = getBandRevisions(band.id);
+  return { band, links, artists, latest: revisions[0] ?? null };
+}
+
+export default function BandDetail() {
+  const { band, links, artists, latest } = useLoaderData<typeof loader>();
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-start justify-between mb-6">
+        <div>
+          <h1 className="text-2xl font-bold">{band.name}</h1>
+          {band.area && <p className="text-gray-400 mt-1 text-sm">{band.area}</p>}
+        </div>
+        <div className="flex items-center gap-3 text-sm shrink-0 ml-4">
+          <Link
+            to={`/bands/of/${band.id}/history`}
+            className="text-gray-400 hover:text-gray-200 transition-colors"
+          >
+            履歴
+          </Link>
+          <Link
+            to={`/bands/of/${band.id}/edit`}
+            className="bg-gray-800 hover:bg-gray-700 text-gray-200 px-3 py-1.5 rounded transition-colors"
+          >
+            編集
+          </Link>
+        </div>
+      </div>
+
+      {artists.length > 0 && (
+        <section className="mb-6">
+          <h2 className="text-xs font-medium text-gray-500 uppercase tracking-wider mb-3">
+            メンバー
+          </h2>
+          <ul className="space-y-2">
+            {artists.map((a) => (
+              <li key={a.artist_id} className="flex items-center gap-3">
+                <Link
+                  to={`/artists/of/${a.artist_id}`}
+                  className="text-blue-400 hover:text-blue-300 transition-colors font-medium"
+                >
+                  {a.artist_name}
+                </Link>
+                {a.role && (
+                  <span className="text-gray-400 text-sm">{a.role}</span>
+                )}
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+
+      {links.length > 0 && (
+        <section className="mb-6">
+          <h2 className="text-xs font-medium text-gray-500 uppercase tracking-wider mb-3">
+            リンク
+          </h2>
+          <ul className="space-y-1.5">
+            {links.map((l) => (
+              <li key={l.id}>
+                <a
+                  href={l.url}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="text-blue-400 hover:text-blue-300 transition-colors text-sm"
+                >
+                  {l.label}
+                </a>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+
+      <hr className="border-gray-800 my-6" />
+      <div className="text-xs text-gray-600 space-y-1 font-mono">
+        <p>/bands/of/{band.id}</p>
+        <p>
+          <Link
+            to={`/bands/named/${band.slug}`}
+            className="hover:text-gray-400 transition-colors"
+          >
+            /bands/named/{band.slug}
+          </Link>
+        </p>
+        {latest && (
+          <p className="font-sans text-gray-500 mt-2">
+            最終更新: {latest.created_at} — {latest.message}
+          </p>
+        )}
+      </div>
+    </main>
+  );
+}
diff --git a/app/routes/band-edit.tsx b/app/routes/band-edit.tsx
new file mode 100644
index 0000000..70e1d60
--- /dev/null
+++ b/app/routes/band-edit.tsx
@@ -0,0 +1,236 @@
+import { useState } from "react";
+import { data, Form, Link, redirect, useActionData, useLoaderData } from "react-router";
+import type { ActionFunctionArgs, LoaderFunctionArgs } from "react-router";
+import {
+  getBandArtists,
+  getBandById,
+  getBandLinks,
+  getIpAddress,
+  listArtists,
+  updateBand,
+} from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const band = getBandById(params.uuid!);
+  if (!band) throw data("Not found", { status: 404 });
+  const links = getBandLinks(band.id);
+  const bandArtists = getBandArtists(band.id);
+  const allArtists = listArtists();
+  return { band, links, bandArtists, allArtists };
+}
+
+export async function action({ params, request }: ActionFunctionArgs) {
+  const band = getBandById(params.uuid!);
+  if (!band) throw data("Not found", { status: 404 });
+
+  const fd = await request.formData();
+  const name = (fd.get("name") as string).trim();
+  const slug = (fd.get("slug") as string).trim();
+  const area = (fd.get("area") as string).trim() || null;
+  const message = (fd.get("message") as string).trim();
+  const links: { label: string; url: string }[] = JSON.parse(
+    (fd.get("links") as string) || "[]"
+  );
+  const artists: { id: string; role: string | null }[] = JSON.parse(
+    (fd.get("artists") as string) || "[]"
+  );
+
+  const errors: Record<string, string> = {};
+  if (!name) errors.name = "必須です";
+  if (!slug) errors.slug = "必須です";
+  if (!message) errors.message = "必須です";
+  if (Object.keys(errors).length > 0) return { errors };
+
+  try {
+    updateBand(band.id, { slug, name, area, links, artists, message, ip_address: getIpAddress(request) });
+  } catch (e) {
+    if (e instanceof Error && e.message.includes("UNIQUE constraint failed: bands.slug")) {
+      return { errors: { slug: "このslugは既に使用されています" } };
+    }
+    throw e;
+  }
+  return redirect(`/bands/of/${band.id}`);
+}
+
+function toSlug(s: string) {
+  return s.trim().toLowerCase().replace(/\s+/g, "-").replace(/[^\w぀-ヿ一-鿿＀-￯-]/g, "").replace(/^-+|-+$/g, "");
+}
+
+export default function BandEdit() {
+  const { band, links: initLinks, bandArtists: initArtists, allArtists } = useLoaderData<typeof loader>();
+  const actionData = useActionData<typeof action>();
+  const errors = actionData?.errors ?? {};
+
+  const [name, setName] = useState(band.name);
+  const [slug, setSlug] = useState(band.slug);
+  const [slugManual, setSlugManual] = useState(true);
+  const [links, setLinks] = useState(initLinks.map((l) => ({ label: l.label, url: l.url })));
+  const [picked, setPicked] = useState(
+    initArtists.map((a) => ({ id: a.artist_id, name: a.artist_name, role: a.role ?? "" }))
+  );
+
+  const available = allArtists.filter((a) => !picked.some((p) => p.id === a.id));
+
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link
+          to={`/bands/of/${band.id}`}
+          className="text-gray-400 hover:text-gray-200 transition-colors"
+        >
+          ←
+        </Link>
+        <h1 className="text-xl font-semibold">Edit Band</h1>
+      </div>
+
+      <Form method="post" className="space-y-5">
+        <input type="hidden" name="links" value={JSON.stringify(links)} />
+        <input
+          type="hidden"
+          name="artists"
+          value={JSON.stringify(picked.map((p) => ({ id: p.id, role: p.role || null })))}
+        />
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            バンド名 <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="name"
+            value={name}
+            onChange={(e) => {
+              setName(e.target.value);
+              if (!slugManual) setSlug(toSlug(e.target.value));
+            }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.name && <p className="text-red-400 text-sm mt-1">{errors.name}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            Slug <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="slug"
+            value={slug}
+            onChange={(e) => { setSlugManual(true); setSlug(e.target.value); }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 font-mono text-sm"
+          />
+          {errors.slug && <p className="text-red-400 text-sm mt-1">{errors.slug}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">活動拠点</label>
+          <input
+            name="area"
+            defaultValue={band.area ?? ""}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">リンク</label>
+          <div className="space-y-2">
+            {links.map((link, i) => (
+              <div key={i} className="flex gap-2">
+                <input
+                  value={link.label}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, label: e.target.value } : l))}
+                  placeholder="ラベル (例: X)"
+                  className="w-28 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <input
+                  value={link.url}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, url: e.target.value } : l))}
+                  placeholder="https://..."
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setLinks(links.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          <button
+            type="button"
+            onClick={() => setLinks([...links, { label: "", url: "" }])}
+            className="mt-2 text-blue-400 hover:text-blue-300 text-sm transition-colors"
+          >
+            + リンクを追加
+          </button>
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">メンバー</label>
+          <div className="space-y-2 mb-2">
+            {picked.map((p, i) => (
+              <div key={p.id} className="flex gap-2 items-center">
+                <span className="text-gray-200 text-sm w-32 truncate">{p.name}</span>
+                <input
+                  value={p.role}
+                  onChange={(e) => setPicked(picked.map((a, idx) => idx === i ? { ...a, role: e.target.value } : a))}
+                  placeholder="パート (例: Guitar)"
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setPicked(picked.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          {available.length > 0 && (
+            <select
+              onChange={(e) => {
+                const a = allArtists.find((x) => x.id === e.target.value);
+                if (a) { setPicked([...picked, { id: a.id, name: a.name, role: "" }]); e.target.value = ""; }
+              }}
+              defaultValue=""
+              className="bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-400 focus:outline-none focus:border-blue-500 text-sm"
+            >
+              <option value="">+ アーティストを追加...</option>
+              {available.map((a) => (
+                <option key={a.id} value={a.id}>{a.name}</option>
+              ))}
+            </select>
+          )}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            更新メッセージ <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="message"
+            placeholder="例: メンバー追加"
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.message && <p className="text-red-400 text-sm mt-1">{errors.message}</p>}
+        </div>
+
+        <div className="flex gap-3 pt-2">
+          <button
+            type="submit"
+            className="bg-blue-600 hover:bg-blue-500 text-white px-4 py-2 rounded font-medium transition-colors"
+          >
+            保存
+          </button>
+          <Link
+            to={`/bands/of/${band.id}`}
+            className="bg-gray-800 hover:bg-gray-700 text-gray-300 px-4 py-2 rounded transition-colors"
+          >
+            キャンセル
+          </Link>
+        </div>
+      </Form>
+    </main>
+  );
+}
diff --git a/app/routes/band-history.tsx b/app/routes/band-history.tsx
new file mode 100644
index 0000000..11e2f2f
--- /dev/null
+++ b/app/routes/band-history.tsx
@@ -0,0 +1,61 @@
+import { data, Link, useLoaderData } from "react-router";
+import type { LoaderFunctionArgs } from "react-router";
+import { getBandById, getBandRevisions } from "~/lib/db.server";
+
+export async function loader({ params }: LoaderFunctionArgs) {
+  const band = getBandById(params.uuid!);
+  if (!band) throw data("Not found", { status: 404 });
+  const revisions = getBandRevisions(band.id);
+  return { band, revisions };
+}
+
+export default function BandHistory() {
+  const { band, revisions } = useLoaderData<typeof loader>();
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link
+          to={`/bands/of/${band.id}`}
+          className="text-gray-400 hover:text-gray-200 transition-colors"
+        >
+          ←
+        </Link>
+        <h1 className="text-xl font-semibold">{band.name} — 編集履歴</h1>
+      </div>
+
+      {revisions.length === 0 ? (
+        <p className="text-gray-400">履歴がありません。</p>
+      ) : (
+        <ol className="space-y-4">
+          {revisions.map((rev, i) => {
+            let snap: { name?: string; area?: string; links?: unknown[]; artists?: unknown[] } = {};
+            try { snap = JSON.parse(rev.snapshot); } catch { /* ignore */ }
+            return (
+              <li key={rev.id} className="bg-gray-900 rounded-lg p-4">
+                <div className="flex items-start justify-between gap-4">
+                  <div className="flex-1 min-w-0">
+                    <p className="font-medium text-gray-100 truncate">{rev.message}</p>
+                    <p className="text-xs text-gray-500 mt-1">
+                      {rev.created_at} · {rev.ip_address}
+                    </p>
+                  </div>
+                  {i === 0 && (
+                    <span className="text-xs text-blue-400 shrink-0">最新</span>
+                  )}
+                </div>
+                <div className="mt-3 text-xs text-gray-400 space-y-0.5">
+                  <p>名前: {snap.name ?? "—"}</p>
+                  {snap.area && <p>拠点: {snap.area}</p>}
+                  <p>
+                    リンク: {snap.links?.length ?? 0}件 / メンバー:{" "}
+                    {snap.artists?.length ?? 0}人
+                  </p>
+                </div>
+              </li>
+            );
+          })}
+        </ol>
+      )}
+    </main>
+  );
+}
diff --git a/app/routes/band-new.tsx b/app/routes/band-new.tsx
new file mode 100644
index 0000000..b0325a3
--- /dev/null
+++ b/app/routes/band-new.tsx
@@ -0,0 +1,219 @@
+import { useState } from "react";
+import { Form, Link, redirect, useActionData, useLoaderData } from "react-router";
+import type { ActionFunctionArgs } from "react-router";
+import { createBand, getIpAddress, listArtists } from "~/lib/db.server";
+
+export function loader() {
+  return { artists: listArtists() };
+}
+
+export async function action({ request }: ActionFunctionArgs) {
+  const fd = await request.formData();
+  const name = (fd.get("name") as string).trim();
+  const slug = (fd.get("slug") as string).trim();
+  const area = (fd.get("area") as string).trim() || null;
+  const message = (fd.get("message") as string).trim();
+  const links: { label: string; url: string }[] = JSON.parse(
+    (fd.get("links") as string) || "[]"
+  );
+  const artists: { id: string; role: string | null }[] = JSON.parse(
+    (fd.get("artists") as string) || "[]"
+  );
+
+  const errors: Record<string, string> = {};
+  if (!name) errors.name = "必須です";
+  if (!slug) errors.slug = "必須です";
+  if (!message) errors.message = "必須です";
+  if (Object.keys(errors).length > 0) return { errors };
+
+  const id = crypto.randomUUID();
+  try {
+    createBand({ id, slug, name, area, links, artists, message, ip_address: getIpAddress(request) });
+  } catch (e) {
+    if (e instanceof Error && e.message.includes("UNIQUE constraint failed: bands.slug")) {
+      return { errors: { slug: "このslugは既に使用されています" } };
+    }
+    throw e;
+  }
+  return redirect(`/bands/of/${id}`);
+}
+
+function toSlug(s: string) {
+  return s.trim().toLowerCase().replace(/\s+/g, "-").replace(/[^\w぀-ヿ一-鿿＀-￯-]/g, "").replace(/^-+|-+$/g, "");
+}
+
+export default function BandNew() {
+  const { artists } = useLoaderData<typeof loader>();
+  const actionData = useActionData<typeof action>();
+  const errors = actionData?.errors ?? {};
+
+  const [name, setName] = useState("");
+  const [slug, setSlug] = useState("");
+  const [slugManual, setSlugManual] = useState(false);
+  const [links, setLinks] = useState<{ label: string; url: string }[]>([]);
+  const [picked, setPicked] = useState<{ id: string; name: string; role: string }[]>([]);
+
+  const available = artists.filter((a) => !picked.some((p) => p.id === a.id));
+
+  return (
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center gap-3 mb-6">
+        <Link to="/" className="text-gray-400 hover:text-gray-200 transition-colors">←</Link>
+        <h1 className="text-xl font-semibold">New Band</h1>
+      </div>
+
+      <Form method="post" className="space-y-5">
+        <input type="hidden" name="links" value={JSON.stringify(links)} />
+        <input
+          type="hidden"
+          name="artists"
+          value={JSON.stringify(picked.map((p) => ({ id: p.id, role: p.role || null })))}
+        />
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            バンド名 <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="name"
+            value={name}
+            onChange={(e) => {
+              setName(e.target.value);
+              if (!slugManual) setSlug(toSlug(e.target.value));
+            }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.name && <p className="text-red-400 text-sm mt-1">{errors.name}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            Slug <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="slug"
+            value={slug}
+            onChange={(e) => { setSlugManual(true); setSlug(e.target.value); }}
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 font-mono text-sm"
+          />
+          {errors.slug && <p className="text-red-400 text-sm mt-1">{errors.slug}</p>}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">活動拠点</label>
+          <input
+            name="area"
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">リンク</label>
+          <div className="space-y-2">
+            {links.map((link, i) => (
+              <div key={i} className="flex gap-2">
+                <input
+                  value={link.label}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, label: e.target.value } : l))}
+                  placeholder="ラベル (例: X)"
+                  className="w-28 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <input
+                  value={link.url}
+                  onChange={(e) => setLinks(links.map((l, idx) => idx === i ? { ...l, url: e.target.value } : l))}
+                  placeholder="https://..."
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setLinks(links.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          <button
+            type="button"
+            onClick={() => setLinks([...links, { label: "", url: "" }])}
+            className="mt-2 text-blue-400 hover:text-blue-300 text-sm transition-colors"
+          >
+            + リンクを追加
+          </button>
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-2">メンバー</label>
+          <div className="space-y-2 mb-2">
+            {picked.map((p, i) => (
+              <div key={p.id} className="flex gap-2 items-center">
+                <span className="text-gray-200 text-sm w-32 truncate">{p.name}</span>
+                <input
+                  value={p.role}
+                  onChange={(e) => setPicked(picked.map((a, idx) => idx === i ? { ...a, role: e.target.value } : a))}
+                  placeholder="パート (例: Guitar)"
+                  className="flex-1 bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500 text-sm"
+                />
+                <button
+                  type="button"
+                  onClick={() => setPicked(picked.filter((_, idx) => idx !== i))}
+                  className="text-gray-500 hover:text-red-400 px-2 transition-colors"
+                >
+                  ×
+                </button>
+              </div>
+            ))}
+          </div>
+          {available.length > 0 ? (
+            <select
+              onChange={(e) => {
+                const a = artists.find((x) => x.id === e.target.value);
+                if (a) { setPicked([...picked, { id: a.id, name: a.name, role: "" }]); e.target.value = ""; }
+              }}
+              defaultValue=""
+              className="bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-400 focus:outline-none focus:border-blue-500 text-sm"
+            >
+              <option value="">+ アーティストを追加...</option>
+              {available.map((a) => (
+                <option key={a.id} value={a.id}>{a.name}</option>
+              ))}
+            </select>
+          ) : artists.length === 0 ? (
+            <p className="text-gray-500 text-sm">
+              アーティストがいません。{" "}
+              <Link to="/artists/new" className="text-blue-400 hover:text-blue-300">先に作成</Link>
+            </p>
+          ) : null}
+        </div>
+
+        <div>
+          <label className="block text-sm font-medium text-gray-300 mb-1">
+            更新メッセージ <span className="text-red-400">*</span>
+          </label>
+          <input
+            name="message"
+            placeholder="例: 初回登録"
+            className="w-full bg-gray-800 border border-gray-700 rounded px-3 py-2 text-gray-100 focus:outline-none focus:border-blue-500"
+          />
+          {errors.message && <p className="text-red-400 text-sm mt-1">{errors.message}</p>}
+        </div>
+
+        <div className="flex gap-3 pt-2">
+          <button
+            type="submit"
+            className="bg-blue-600 hover:bg-blue-500 text-white px-4 py-2 rounded font-medium transition-colors"
+          >
+            作成
+          </button>
+          <Link
+            to="/"
+            className="bg-gray-800 hover:bg-gray-700 text-gray-300 px-4 py-2 rounded transition-colors"
+          >
+            キャンセル
+          </Link>
+        </div>
+      </Form>
+    </main>
+  );
+}
diff --git a/app/routes/home.tsx b/app/routes/home.tsx
index 03ae39a..3df4ab5 100644
--- a/app/routes/home.tsx
+++ b/app/routes/home.tsx
@@ -1,8 +1,46 @@
+import { Link, useLoaderData } from "react-router";
+import { listBands } from "~/lib/db.server";
+
+export function loader() {
+  return { bands: listBands() };
+}
+
 export default function Home() {
+  const { bands } = useLoaderData<typeof loader>();
   return (
-    <main className="container mx-auto px-4 py-16 text-center">
-      <h1 className="text-4xl font-bold tracking-tight">whois.band</h1>
-      <p className="mt-4 text-gray-400">Band identification service. Coming soon.</p>
+    <main className="max-w-3xl mx-auto px-4 py-8">
+      <div className="flex items-center justify-between mb-6">
+        <h1 className="text-xl font-semibold">Bands</h1>
+        <Link to="/bands/new" className="text-sm text-blue-400 hover:text-blue-300">
+          + New Band
+        </Link>
+      </div>
+      {bands.length === 0 ? (
+        <p className="text-gray-400">
+          まだバンドがありません。{" "}
+          <Link to="/bands/new" className="text-blue-400 hover:text-blue-300">
+            追加する
+          </Link>
+        </p>
+      ) : (
+        <ul className="divide-y divide-gray-800">
+          {bands.map((band) => (
+            <li key={band.id} className="py-3">
+              <Link
+                to={`/bands/of/${band.id}`}
+                className="flex items-baseline gap-3 group"
+              >
+                <span className="font-medium group-hover:text-blue-300 transition-colors">
+                  {band.name}
+                </span>
+                {band.area && (
+                  <span className="text-gray-400 text-sm">{band.area}</span>
+                )}
+              </Link>
+            </li>
+          ))}
+        </ul>
+      )}
     </main>
   );
 }