wip party impl

api/src/db/schema.ts

@@ -3,6 +3,7 @@ import {
   boolean,
   index,
   integer,
+  json,
   pgEnum,
   pgTable,
   primaryKey,
@@ -10,11 +11,49 @@ import {
   timestamp,
   uniqueIndex,
   uuid,
-  varchar,
 } from "drizzle-orm/pg-core";
 import { user } from "./auth-schema";
 export * from "./auth-schema";
 
+export const partyStatus = pgEnum("party_status", [
+  "created",
+  "started",
+  "ended",
+]);
+
+export const party = pgTable("party", {
+  id: uuid().defaultRandom().primaryKey().notNull(),
+  hostId: text()
+    .references(() => user.id)
+    .notNull(),
+  data: json(),
+  analysisData: json(),
+  createdAt: timestamp().defaultNow().notNull(),
+  lastUpdated: timestamp().defaultNow().notNull(),
+  status: partyStatus().notNull(),
+});
+
+export const memberStatus = pgEnum("member_status", [
+  "connected",
+  "disconnected",
+]);
+
+export const partyMember = pgTable(
+  "party_member",
+  {
+    id: uuid().defaultRandom().primaryKey().notNull(),
+    partyId: uuid()
+      .references(() => party.id)
+      .notNull(),
+    userId: uuid()
+      .references(() => user.id)
+      .notNull(),
+    joinedAt: timestamp().defaultNow().notNull(),
+    lastSeen: timestamp().defaultNow().notNull(),
+  },
+  (partyMember) => [uniqueIndex().on(partyMember.partyId, partyMember.userId)],
+);
+
 export const platform = pgEnum("enum_platform", ["spotify", "apple"]);
 
 export const artist = pgTable("artist", {
@@ -308,6 +347,8 @@ export const relations = defineRelations(
     artistImage,
     followedArtist,
     genre,
+    party,
+    partyMember,
     platformImage,
     playbackHistory,
     savedAlbum,
@@ -377,6 +418,23 @@ export const relations = defineRelations(
         to: r.album.id.through(r.albumImage.albumId),
       }),
     },
+    party: {
+      members: r.many.partyMember(),
+      host: r.one.user({
+        from: r.party.hostId,
+        to: r.user.id,
+      }),
+    },
+    partyMember: {
+      party: r.one.party({
+        from: r.partyMember.partyId,
+        to: r.party.id,
+      }),
+      user: r.one.user({
+        from: r.partyMember.userId,
+        to: r.user.id,
+      }),
+    },
     artistImage: {
       artist: r.one.artist({
         from: r.artistImage.artistId,
@@ -520,5 +578,12 @@ export const relations = defineRelations(
         to: r.user.id,
       }),
     },
+    user: {
+      partyMembers: r.many.partyMember(),
+      hostedParties: r.many.party({
+        from: r.user.id,
+        to: r.party.hostId,
+      }),
+    },
   }),
 );

api/src/db/spotify.ts

@@ -29,7 +29,7 @@ import {
   track,
   trackArtist,
 } from "./schema";
-import { and, eq, inArray } from "drizzle-orm";
+import { and, eq, inArray, sql } from "drizzle-orm";
 import { defaultSdk } from "../auth";
 
 export const PLATFORM_SPOTIFY = "spotify" as const;
@@ -43,30 +43,38 @@ type DbTransaction = Parameters<typeof db.transaction>[0] extends (
 type DbLike = DbClient | DbTransaction;
 
 export async function upsertImages(images: Image[], dbClient: DbLike = db) {
-  await dbClient.insert(platformImage).values(
-    images.map(({ url, height, width }) => ({
-      platform: PLATFORM_SPOTIFY,
-      url,
-      height,
-      width,
-    })),
-  );
+  await dbClient
+    .insert(platformImage)
+    .values(
+      images.map(({ url, height, width }) => ({
+        platform: PLATFORM_SPOTIFY,
+        url,
+        height,
+        width,
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertGenres(genres: string[], dbClient: DbLike = db) {
-  await dbClient.insert(genre).values(genres.map((name) => ({ name })));
+  const values = genres.filter(Boolean).map((name) => ({ name }));
+  if (values.length === 0) return;
+  await dbClient.insert(genre).values(values).onConflictDoNothing();
 }
 
 export async function upsertArtists(artists: Artist[], dbClient: DbLike = db) {
-  await dbClient.insert(artist).values(
-    artists.map(({ id, name, images, genres, popularity, type }) => ({
-      platform: PLATFORM_SPOTIFY,
-      platform_id: id,
-      name,
-      popularity,
-      type,
-    })),
-  );
+  await dbClient
+    .insert(artist)
+    .values(
+      artists.map(({ id, name, images, genres, popularity, type }) => ({
+        platform: PLATFORM_SPOTIFY,
+        platform_id: id,
+        name,
+        popularity,
+        type,
+      })),
+    )
+    .onConflictDoNothing();
   await upsertImages(
     artists.flatMap((a) => a.images),
     dbClient,
@@ -76,34 +84,40 @@ export async function upsertArtists(artists: Artist[], dbClient: DbLike = db) {
     dbClient,
   );
   for (const spotifyArtist of artists) {
-    await dbClient.insert(artistImage).select(
-      dbClient
-        .select({
-          artistId: artist.id,
-          imageId: platformImage.id,
-        })
-        .from(platformImage)
-        .where(
-          and(
-            eq(platformImage.platform, PLATFORM_SPOTIFY),
-            inArray(
-              platformImage.url,
-              spotifyArtist.images.map((t) => t.url),
+    await dbClient
+      .insert(artistImage)
+      .select(
+        dbClient
+          .select({
+            artistId: artist.id,
+            imageId: platformImage.id,
+          })
+          .from(platformImage)
+          .where(
+            and(
+              eq(platformImage.platform, PLATFORM_SPOTIFY),
+              inArray(
+                platformImage.url,
+                spotifyArtist.images.map((t) => t.url),
+              ),
             ),
-          ),
-        )
-        .innerJoin(artist, eq(artist.platform_id, spotifyArtist.id)),
-    );
-    await dbClient.insert(artistGenre).select(
-      dbClient
-        .select({
-          artistId: artist.id,
-          genreId: genre.id,
-        })
-        .from(genre)
-        .where(inArray(genre.name, spotifyArtist.genres))
-        .innerJoin(artist, eq(artist.platform_id, spotifyArtist.id)),
-    );
+          )
+          .innerJoin(artist, eq(artist.platform_id, spotifyArtist.id)),
+      )
+      .onConflictDoNothing();
+    await dbClient
+      .insert(artistGenre)
+      .select(
+        dbClient
+          .select({
+            artistId: artist.id,
+            genreId: genre.id,
+          })
+          .from(genre)
+          .where(inArray(genre.name, spotifyArtist.genres))
+          .innerJoin(artist, eq(artist.platform_id, spotifyArtist.id)),
+      )
+      .onConflictDoNothing();
   }
 }
 
@@ -121,7 +135,14 @@ async function lookupMissingArtists(
 ) {
   const missingArtistIds = await getMissingArtists(artistIds, dbClient);
   if (missingArtistIds.length === 0) return [];
-  const missingArtists = await defaultSdk.artists.get(missingArtistIds);
+  let missingArtists: Artist[] = [];
+  for (let i = 0; i < missingArtistIds.length / 50; i++) {
+    missingArtists.push(
+      ...(await defaultSdk.artists.get(
+        missingArtistIds.slice(i * 50, (i + 1) * 50),
+      )),
+    );
+  }
   await upsertArtists(missingArtists, dbClient);
   return missingArtists;
 }
@@ -191,17 +212,20 @@ export async function upsertAlbums(
     albums.flatMap((a) => a.artists),
     dbClient,
   );
-  await dbClient.insert(album).values(
-    albums.map(({ id, name, type, popularity, release_date, label }) => ({
-      platform: PLATFORM_SPOTIFY,
-      platform_id: id,
-      name,
-      type,
-      popularity,
-      release_date: new Date(release_date),
-      label,
-    })),
-  );
+  await dbClient
+    .insert(album)
+    .values(
+      albums.map(({ id, name, type, popularity, release_date, label }) => ({
+        platform: PLATFORM_SPOTIFY,
+        platform_id: id,
+        name,
+        type,
+        popularity,
+        release_date: new Date(release_date),
+        label,
+      })),
+    )
+    .onConflictDoNothing();
   await upsertImages(
     albums.flatMap((a) => a.images),
     dbClient,
@@ -211,49 +235,59 @@ export async function upsertAlbums(
     dbClient,
   );
   for (const spotifyAlbum of albums) {
-    await dbClient.insert(albumImage).select(
-      dbClient
-        .select({
-          albumId: album.id,
-          imageId: platformImage.id,
-        })
-        .from(platformImage)
-        .where(
-          and(
-            eq(platformImage.platform, PLATFORM_SPOTIFY),
-            inArray(
-              platformImage.url,
-              spotifyAlbum.images.map((t) => t.url),
+    await dbClient
+      .insert(albumImage)
+      .select(
+        dbClient
+          .select({
+            albumId: album.id,
+            imageId: platformImage.id,
+          })
+          .from(platformImage)
+          .where(
+            and(
+              eq(platformImage.platform, PLATFORM_SPOTIFY),
+              inArray(
+                platformImage.url,
+                spotifyAlbum.images.map((t) => t.url),
+              ),
             ),
-          ),
+          )
+          .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
+      )
+      .onConflictDoNothing();
+    await dbClient
+      .insert(albumArtist)
+      .select(
+        dbClient
+          .select({
+            albumId: album.id,
+            artistId: artist.id,
+          })
+          .from(artist)
+          .where(
+            inArray(
+              artist.platform_id,
+              spotifyAlbum.artists.map((t) => t.id),
+            ),
+          )
+          .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
+      )
+      .onConflictDoNothing();
+    if (spotifyAlbum.genres?.length > 0)
+      await dbClient
+        .insert(albumGenre)
+        .select(
+          dbClient
+            .select({
+              albumId: album.id,
+              genreId: genre.id,
+            })
+            .from(genre)
+            .where(inArray(genre.name, sql`${spotifyAlbum.genres}`))
+            .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
         )
-        .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
-    );
-    await dbClient.insert(albumArtist).select(
-      dbClient
-        .select({
-          albumId: album.id,
-          artistId: artist.id,
-        })
-        .from(artist)
-        .where(
-          inArray(
-            artist.platform_id,
-            spotifyAlbum.artists.map((t) => t.id),
-          ),
-        )
-        .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
-    );
-    await dbClient.insert(albumGenre).select(
-      dbClient
-        .select({
-          albumId: album.id,
-          genreId: genre.id,
-        })
-        .from(genre)
-        .where(inArray(genre.name, spotifyAlbum.genres))
-        .innerJoin(album, eq(album.platform_id, spotifyAlbum.id)),
-    );
+        .onConflictDoNothing();
   }
 }
 
@@ -271,35 +305,41 @@ export async function upsertTracks(tracks: Track[], dbClient: DbLike = db) {
     tracks.map((t) => t.album.id),
     dbClient,
   );
-  await dbClient.insert(track).values(
-    tracks.map((spotifyTrack) => ({
-      albumId: albumIdMap.get(spotifyTrack.album.id)!,
-      name: spotifyTrack.name,
-      platform: PLATFORM_SPOTIFY,
-      platform_id: spotifyTrack.id,
-      popularity: spotifyTrack.popularity,
-      duration: spotifyTrack.duration_ms,
-      explicit: spotifyTrack.explicit,
-      disc_number: spotifyTrack.disc_number,
-      track_number: spotifyTrack.track_number,
-    })),
-  );
+  await dbClient
+    .insert(track)
+    .values(
+      tracks.map((spotifyTrack) => ({
+        albumId: albumIdMap.get(spotifyTrack.album.id)!,
+        name: spotifyTrack.name,
+        platform: PLATFORM_SPOTIFY,
+        platform_id: spotifyTrack.id,
+        popularity: spotifyTrack.popularity,
+        duration: spotifyTrack.duration_ms,
+        explicit: spotifyTrack.explicit,
+        disc_number: spotifyTrack.disc_number,
+        track_number: spotifyTrack.track_number,
+      })),
+    )
+    .onConflictDoNothing();
   for (const spotifyTrack of tracks) {
-    await dbClient.insert(trackArtist).select(
-      dbClient
-        .select({
-          trackId: track.id,
-          artistId: artist.id,
-        })
-        .from(artist)
-        .where(
-          inArray(
-            artist.platform_id,
-            spotifyTrack.artists.map((t) => t.id),
-          ),
-        )
-        .innerJoin(track, eq(track.platform_id, spotifyTrack.id)),
-    );
+    await dbClient
+      .insert(trackArtist)
+      .select(
+        dbClient
+          .select({
+            trackId: track.id,
+            artistId: artist.id,
+          })
+          .from(artist)
+          .where(
+            inArray(
+              artist.platform_id,
+              spotifyTrack.artists.map((t) => t.id),
+            ),
+          )
+          .innerJoin(track, eq(track.platform_id, spotifyTrack.id)),
+      )
+      .onConflictDoNothing();
   }
 }
 
@@ -315,14 +355,17 @@ export async function upsertTopArtists(
     artists.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(topArtist).values(
-    artists.map((spotifyArtist, index) => ({
-      artistId: artistIdMap.get(spotifyArtist.id)!,
-      position: index + 1,
-      userId,
-      timeline,
-    })),
-  );
+  await dbClient
+    .insert(topArtist)
+    .values(
+      artists.map((spotifyArtist, index) => ({
+        artistId: artistIdMap.get(spotifyArtist.id)!,
+        position: index + 1,
+        userId,
+        timeline,
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertTopTracks(
@@ -337,14 +380,17 @@ export async function upsertTopTracks(
     tracks.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(topTrack).values(
-    tracks.map((spotifyTrack, index) => ({
-      trackId: trackIdMap.get(spotifyTrack.id)!,
-      position: index + 1,
-      userId,
-      timeline,
-    })),
-  );
+  await dbClient
+    .insert(topTrack)
+    .values(
+      tracks.map((spotifyTrack, index) => ({
+        trackId: trackIdMap.get(spotifyTrack.id)!,
+        position: index + 1,
+        userId,
+        timeline,
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertSavedAlbums(
@@ -359,13 +405,16 @@ export async function upsertSavedAlbums(
     albums.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(savedAlbum).values(
-    saved.map((item) => ({
-      albumId: albumIdMap.get(item.album.id)!,
-      userId,
-      saved_at: new Date(item.added_at),
-    })),
-  );
+  await dbClient
+    .insert(savedAlbum)
+    .values(
+      saved.map((item) => ({
+        albumId: albumIdMap.get(item.album.id)!,
+        userId,
+        saved_at: new Date(item.added_at),
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertSavedTracks(
@@ -380,13 +429,16 @@ export async function upsertSavedTracks(
     tracks.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(savedTrack).values(
-    saved.map((item) => ({
-      trackId: trackIdMap.get(item.track.id)!,
-      userId,
-      saved_at: new Date(item.added_at),
-    })),
-  );
+  await dbClient
+    .insert(savedTrack)
+    .values(
+      saved.map((item) => ({
+        trackId: trackIdMap.get(item.track.id)!,
+        userId,
+        saved_at: new Date(item.added_at),
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertFollowedArtists(
@@ -400,12 +452,15 @@ export async function upsertFollowedArtists(
     artists.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(followedArtist).values(
-    artists.map((spotifyArtist) => ({
-      artistId: artistIdMap.get(spotifyArtist.id)!,
-      userId,
-    })),
-  );
+  await dbClient
+    .insert(followedArtist)
+    .values(
+      artists.map((spotifyArtist) => ({
+        artistId: artistIdMap.get(spotifyArtist.id)!,
+        userId,
+      })),
+    )
+    .onConflictDoNothing();
 }
 
 export async function upsertPlaybackHistory(
@@ -420,11 +475,14 @@ export async function upsertPlaybackHistory(
     tracks.map((t) => t.id),
     dbClient,
   );
-  await dbClient.insert(playbackHistory).values(
-    items.map((item) => ({
-      trackId: trackIdMap.get(item.track.id)!,
-      userId,
-      played_at: new Date(item.played_at),
-    })),
-  );
+  await dbClient
+    .insert(playbackHistory)
+    .values(
+      items.map((item) => ({
+        trackId: trackIdMap.get(item.track.id)!,
+        userId,
+        played_at: new Date(item.played_at),
+      })),
+    )
+    .onConflictDoNothing();
 }

api/src/index.ts

@@ -4,10 +4,12 @@ import { syncApp } from "./routes/sync";
 import { DBOS } from "@dbos-inc/dbos-sdk";
 import "./workflows/sync";
 import "./dbos.ts";
+import { statsApp } from "./routes/stats.ts";
+import { partyApp } from "./routes/party";
 
 const app = new Elysia()
   .use(betterAuthElysia)
-  .group("/api", (app) => app.use(syncApp))
+  .group("/api", (app) => app.use(syncApp).use(statsApp).use(partyApp))
   .listen(4000);
 
 export type App = typeof app;

api/src/routes/party.ts

@@ -0,0 +1,298 @@
+import Elysia, { t } from "elysia";
+import { and, eq } from "drizzle-orm";
+import { betterAuthElysia } from "../auth";
+import { db } from "../db";
+import { party, partyMember } from "../db/schema";
+
+const PARTY_STATUS = ["created", "started", "ended"] as const;
+
+type PartyStatus = (typeof PARTY_STATUS)[number];
+
+type DbClient = typeof db;
+type DbTransaction = Parameters<typeof db.transaction>[0] extends (
+  tx: infer T,
+) => Promise<any>
+  ? T
+  : never;
+type DbLike = DbClient | DbTransaction;
+
+async function getPartyForUser(userId: string) {
+  const memberships = await db.query.partyMember.findMany({
+    where: {
+      userId,
+    },
+    with: {
+      party: true,
+    },
+    limit: 1,
+  });
+  return memberships[0]?.party ?? null;
+}
+
+async function getMemberRecord(dbClient: DbLike, userId: string) {
+  return (
+    (await dbClient.query.partyMember.findFirst({
+      where: {
+        userId,
+      },
+    })) ?? null
+  );
+}
+
+async function getPartyStatus(partyId: string) {
+  const party = await db.query.party.findFirst({
+    where: {
+      id: partyId,
+    },
+  });
+  if (!party) return null;
+  const members = await db.query.partyMember.findMany({
+    where: {
+      partyId,
+    },
+    with: {
+      user: true,
+    },
+    orderBy: {
+      joinedAt: "asc",
+    },
+  });
+  return {
+    party,
+    members,
+  };
+}
+
+async function cleanupPartyIfEmpty(dbClient: DbLike, partyId: string) {
+  const members = await dbClient.query.partyMember.findMany({
+    where: {
+      partyId,
+    },
+    limit: 1,
+  });
+  if (members.length > 0) return;
+  await dbClient.delete(party).where(eq(party.id, partyId));
+}
+
+async function leaveParty(dbClient: DbLike, userId: string) {
+  const member = await getMemberRecord(dbClient, userId);
+  if (!member) return null;
+  await dbClient.delete(partyMember).where(eq(partyMember.id, member.id));
+  const nextHost = await dbClient.query.partyMember.findFirst({
+    where: {
+      partyId: member.partyId,
+    },
+    orderBy: {
+      joinedAt: "asc",
+    },
+  });
+  if (nextHost) {
+    const currentParty = await dbClient.query.party.findFirst({
+      where: {
+        id: member.partyId,
+      },
+    });
+    if (currentParty?.hostId === userId) {
+      await dbClient
+        .update(party)
+        .set({
+          hostId: nextHost.userId,
+          lastUpdated: new Date(),
+        })
+        .where(eq(party.id, member.partyId));
+    }
+  }
+  await cleanupPartyIfEmpty(dbClient, member.partyId);
+  return member.partyId;
+}
+
+function isValidStatus(status: string): status is PartyStatus {
+  return PARTY_STATUS.includes(status as PartyStatus);
+}
+
+export const partyApp = new Elysia()
+  .use(betterAuthElysia)
+  .group("/party", (app) =>
+    app
+      .get(
+        "/status",
+        async ({ user }) => {
+          const currentParty = await getPartyForUser(user.id);
+          if (!currentParty) return { party: null, members: [] };
+          const status = await getPartyStatus(currentParty.id);
+          return status ?? { party: null, members: [] };
+        },
+        { auth: true },
+      )
+      .post(
+        "/join",
+        async ({ user, body, set }) => {
+          const targetUserId = body.targetUserId;
+          const targetUser = await db.query.user.findFirst({
+            where: {
+              id: targetUserId,
+            },
+          });
+          if (!targetUser) {
+            set.status = 404;
+            return { error: "Target user not found." };
+          }
+
+          let partyId: string | null = null;
+          await db.transaction(async (tx) => {
+            await leaveParty(tx, user.id);
+
+            const targetMembership = await getMemberRecord(tx, targetUserId);
+            if (targetMembership) {
+              partyId = targetMembership.partyId;
+              await tx
+                .update(party)
+                .set({
+                  hostId: targetUserId,
+                  lastUpdated: new Date(),
+                })
+                .where(eq(party.id, partyId));
+            } else {
+              const created = await tx
+                .insert(party)
+                .values({
+                  status: "created",
+                  hostId: targetUserId,
+                })
+                .returning({ id: party.id });
+              partyId = created[0]!.id;
+              await tx.insert(partyMember).values({
+                partyId,
+                userId: targetUserId,
+              });
+            }
+
+            await tx
+              .insert(partyMember)
+              .values({ partyId, userId: user.id })
+              .onConflictDoNothing();
+          });
+
+          if (!partyId) return { party: null, members: [] };
+          const status = await getPartyStatus(partyId);
+          return status ?? { party: null, members: [] };
+        },
+        {
+          auth: true,
+          body: t.Object({
+            targetUserId: t.String(),
+          }),
+        },
+      )
+      .post(
+        "/leave",
+        async ({ user }) => {
+          const partyId = await db.transaction(async (tx) => {
+            return await leaveParty(tx, user.id);
+          });
+          if (!partyId) return { party: null, members: [] };
+          const status = await getPartyStatus(partyId);
+          return status ?? { party: null, members: [] };
+        },
+        { auth: true },
+      )
+      .post(
+        "/kick",
+        async ({ user, body, set }) => {
+          const currentMembership = await getMemberRecord(db, user.id);
+          if (!currentMembership) {
+            set.status = 400;
+            return { error: "You are not in a party." };
+          }
+
+          const currentParty = await db.query.party.findFirst({
+            where: {
+              id: currentMembership.partyId,
+            },
+          });
+          if (!currentParty || currentParty.hostId !== user.id) {
+            set.status = 403;
+            return { error: "Only the host can kick members." };
+          }
+
+          if (body.memberUserId === user.id) {
+            set.status = 400;
+            return { error: "Host cannot kick themselves." };
+          }
+
+          await db.transaction(async (tx) => {
+            await tx
+              .delete(partyMember)
+              .where(
+                and(
+                  eq(partyMember.partyId, currentMembership.partyId),
+                  eq(partyMember.userId, body.memberUserId),
+                ),
+              );
+            await cleanupPartyIfEmpty(tx, currentMembership.partyId);
+          });
+          const status = await getPartyStatus(currentMembership.partyId);
+          return status ?? { party: null, members: [] };
+        },
+        {
+          auth: true,
+          body: t.Object({
+            memberUserId: t.String(),
+          }),
+        },
+      )
+      .post(
+        "/status",
+        async ({ user, body, set }) => {
+          const currentMembership = await getMemberRecord(db, user.id);
+          if (!currentMembership) {
+            set.status = 400;
+            return { error: "You are not in a party." };
+          }
+
+          const currentParty = await db.query.party.findFirst({
+            where: {
+              id: currentMembership.partyId,
+            },
+          });
+          if (!currentParty || currentParty.hostId !== user.id) {
+            set.status = 403;
+            return { error: "Only the host can update party status." };
+          }
+
+          if (!isValidStatus(body.status)) {
+            set.status = 400;
+            return { error: "Invalid party status." };
+          }
+
+          const currentData =
+            currentParty?.data && typeof currentParty.data === "object"
+              ? currentParty.data
+              : {};
+          const nextData = body.data
+            ? { ...currentData, ...body.data }
+            : currentData;
+
+          await db.transaction(async (tx) => {
+            await tx
+              .update(party)
+              .set({
+                status: body.status,
+                data: nextData,
+                lastUpdated: new Date(),
+              })
+              .where(eq(party.id, currentMembership.partyId));
+          });
+
+          const status = await getPartyStatus(currentMembership.partyId);
+          return status ?? { party: null, members: [] };
+        },
+        {
+          auth: true,
+          body: t.Object({
+            status: t.Enum({ created: "created", started: "started" }),
+            data: t.Optional(t.Any()),
+          }),
+        },
+      ),
+  );

api/src/routes/stats.ts

@@ -0,0 +1,104 @@
+import Elysia from "elysia";
+import { sql } from "drizzle-orm";
+import { betterAuthElysia } from "../auth";
+import { db } from "../db";
+import {
+  artistGenre,
+  genre,
+  savedTrack,
+  topTrack,
+  trackArtist,
+} from "../db/schema";
+
+export const statsApp = new Elysia().use(betterAuthElysia).get(
+  "/stats",
+  async ({ user }) => {
+    const topArtists = await db.query.topArtist.findMany({
+      limit: 10,
+      with: {
+        artist: {
+          with: {
+            genres: true,
+            images: true,
+          },
+        },
+      },
+      where: {
+        userId: user.id,
+      },
+    });
+    const topTracks = await db.query.topTrack.findMany({
+      limit: 10,
+      with: {
+        track: {
+          with: {
+            album: {
+              with: {
+                images: true,
+              },
+            },
+            artists: {
+              with: {
+                genres: true,
+              },
+            },
+          },
+        },
+      },
+      where: {
+        userId: user.id,
+        timeline: "medium_term",
+      },
+      orderBy: {
+        position: "desc",
+      },
+    });
+    const recentTracks = await db.query.playbackHistory.findMany({
+      limit: 10,
+      with: {
+        track: {
+          with: {
+            album: {
+              with: {
+                images: true,
+              },
+            },
+          },
+        },
+      },
+      where: {
+        userId: user.id,
+      },
+    });
+    const topGenresResult = await db.execute<{
+      name: string;
+      count: number;
+    }>(sql`
+      select ${genre.name} as name, count(*)::int as count
+      from (
+        select distinct ${trackArtist.trackId} as track_id, ${artistGenre.genreId} as genre_id
+        from ${trackArtist}
+        inner join ${artistGenre} on ${artistGenre.artistId} = ${trackArtist.artistId}
+        inner join (
+          select ${topTrack.trackId} as track_id
+          from ${topTrack}
+          where ${topTrack.userId} = ${user.id}
+            and ${topTrack.timeline} = 'medium_term'
+          union
+          select ${savedTrack.trackId} as track_id
+          from ${savedTrack}
+          where ${savedTrack.userId} = ${user.id}
+        ) as selected_tracks on selected_tracks.track_id = ${trackArtist.trackId}
+      ) as genre_tracks
+      inner join ${genre} on ${genre.id} = genre_tracks.genre_id
+      group by ${genre.name}
+      order by count desc
+      limit 10
+    `);
+    const topGenres = topGenresResult.rows;
+    return { topArtists, topTracks, recentTracks, topGenres };
+  },
+  {
+    auth: true,
+  },
+);

api/src/workflows/sync.ts

@@ -70,34 +70,79 @@ export class SpotifySyncWorkflow extends ConfiguredInstance {
     };
   }
 
-  @DBOS.step()
   private async persistSpotifyData(userId: string, data: SyncPayload) {
+    await this.persistTopArtists(userId, data.topArtistsByTimeline);
+    await this.persistTopTracks(userId, data.topTracksByTimeline);
+    await this.persistFollowedArtists(userId, data.followedArtists);
+    await this.persistSavedAlbums(userId, data.savedAlbums);
+    await this.persistSavedTracks(userId, data.savedTracks);
+    await this.persistPlaybackHistory(userId, data.recentlyPlayed);
+  }
+
+  @DBOS.step()
+  private async persistTopArtists(
+    userId: string,
+    topArtistsByTimeline: Record<Timeline, Artist[]>,
+  ) {
     await db.transaction(async (tx) => {
       await tx.delete(topArtist).where(eq(topArtist.userId, userId));
-      await tx.delete(topTrack).where(eq(topTrack.userId, userId));
-      await tx.delete(savedAlbum).where(eq(savedAlbum.userId, userId));
-      await tx.delete(savedTrack).where(eq(savedTrack.userId, userId));
-      await tx.delete(followedArtist).where(eq(followedArtist.userId, userId));
       for (const timeline of timelines) {
         await upsertTopArtists(
           userId,
           timeline,
-          data.topArtistsByTimeline[timeline],
+          topArtistsByTimeline[timeline],
           tx,
         );
       }
+    });
+  }
+
+  @DBOS.step()
+  private async persistTopTracks(
+    userId: string,
+    topTracksByTimeline: Record<Timeline, Track[]>,
+  ) {
+    await db.transaction(async (tx) => {
+      await tx.delete(topTrack).where(eq(topTrack.userId, userId));
       for (const timeline of timelines) {
         await upsertTopTracks(
           userId,
           timeline,
-          data.topTracksByTimeline[timeline],
+          topTracksByTimeline[timeline],
           tx,
         );
       }
-      await upsertFollowedArtists(userId, data.followedArtists, tx);
-      await upsertSavedAlbums(userId, data.savedAlbums, tx);
-      await upsertSavedTracks(userId, data.savedTracks, tx);
-      await upsertPlaybackHistory(userId, data.recentlyPlayed, tx);
+    });
+  }
+
+  @DBOS.step()
+  private async persistFollowedArtists(userId: string, artists: Artist[]) {
+    await db.transaction(async (tx) => {
+      await tx.delete(followedArtist).where(eq(followedArtist.userId, userId));
+      await upsertFollowedArtists(userId, artists, tx);
+    });
+  }
+
+  @DBOS.step()
+  private async persistSavedAlbums(userId: string, albums: SavedAlbum[]) {
+    await db.transaction(async (tx) => {
+      await tx.delete(savedAlbum).where(eq(savedAlbum.userId, userId));
+      await upsertSavedAlbums(userId, albums, tx);
+    });
+  }
+
+  @DBOS.step()
+  private async persistSavedTracks(userId: string, tracks: SavedTrack[]) {
+    await db.transaction(async (tx) => {
+      await tx.delete(savedTrack).where(eq(savedTrack.userId, userId));
+      await upsertSavedTracks(userId, tracks, tx);
+    });
+  }
+
+  @DBOS.step()
+  private async persistPlaybackHistory(userId: string, items: PlayHistory[]) {
+    await db.transaction(async (tx) => {
+      await upsertPlaybackHistory(userId, items, tx);
     });
   }
 
@@ -140,8 +185,8 @@ export class SpotifySyncWorkflow extends ConfiguredInstance {
       const page = await sdk.currentUser.followedArtists(after, 50);
       const artists = page.artists;
       followed.push(...artists.items);
-      if (!artists.next) break;
-      after = artists.next;
+      if (!artists.next || artists.items.length === 0) break;
+      after = artists.items[artists.items.length - 1]!.id;
     }
     return followed;
   }

web/src/components/quick-stats.tsx

@@ -0,0 +1,107 @@
+import { client } from "#/lib/eden";
+import { useQuery } from "@tanstack/react-query";
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "#/components/ui/card";
+import { Avatar, AvatarGroup, AvatarImage } from "#/components/ui/avatar";
+import {
+  Item,
+  ItemContent,
+  ItemDescription,
+  ItemGroup,
+  ItemMedia,
+  ItemTitle,
+} from "#/components/ui/item";
+import { Badge } from "#/components/ui/badge";
+import { Spinner } from "#/components/ui/spinner";
+import { Section, SectionTitle } from "./ui/section";
+
+const MAX_AVATARS = 6;
+
+export function QuickStats() {
+  const { isLoading, data } = useQuery({
+    queryFn: () => client.api.stats.get(),
+    queryKey: ["stats"],
+  });
+
+  if (isLoading) {
+    return (
+      <Card size="sm">
+        <CardHeader>
+          <CardTitle>Quick stats</CardTitle>
+          <CardDescription>Loading your music highlights.</CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="flex items-center gap-2 text-muted-foreground">
+            <Spinner />
+            Fetching stats
+          </div>
+        </CardContent>
+      </Card>
+    );
+  }
+
+  const topArtists = data?.data?.topArtists ?? [];
+  const topTracks = data?.data?.topTracks ?? [];
+  const topGenres = data?.data?.topGenres ?? [];
+
+  return (
+    <Section>
+      <SectionTitle>Data overview</SectionTitle>
+      <ItemGroup>
+        <Item size="sm" variant="muted">
+          <ItemMedia>
+            <AvatarGroup>
+              {topArtists.slice(0, MAX_AVATARS).map((entry) => (
+                <Avatar key={entry.artistId} size="sm">
+                  <AvatarImage
+                    src={entry.artist?.images?.[0]?.url || undefined}
+                    alt={entry.artist?.name || ""}
+                  />
+                </Avatar>
+              ))}
+            </AvatarGroup>
+          </ItemMedia>
+          <ItemContent>
+            <ItemTitle>Artists</ItemTitle>
+          </ItemContent>
+        </Item>
+        <Item size="sm" variant="muted">
+          <ItemMedia>
+            <AvatarGroup>
+              {topTracks.slice(0, MAX_AVATARS).map((entry) => (
+                <Avatar key={entry.trackId} size="sm">
+                  <AvatarImage
+                    src={entry.track?.album?.images?.[0]?.url || undefined}
+                    alt={entry.track?.name || ""}
+                  />
+                </Avatar>
+              ))}
+            </AvatarGroup>
+          </ItemMedia>
+          <ItemContent>
+            <ItemTitle>Tracks</ItemTitle>
+          </ItemContent>
+        </Item>
+        <Item size="sm" variant="muted">
+          <ItemContent>
+            <ItemTitle>Genres</ItemTitle>
+            <ItemDescription className="flex flex-wrap gap-2">
+              {topGenres.length === 0
+                ? "No genres yet."
+                : topGenres.slice(0, 8).map((genre) => (
+                    <Badge key={genre.name} variant="outline">
+                      {genre.name}
+                    </Badge>
+                  ))}
+            </ItemDescription>
+          </ItemContent>
+        </Item>
+      </ItemGroup>
+    </Section>
+  );
+}

web/src/components/sync-button.tsx

@@ -1,22 +1,33 @@
 import { client } from "#/lib/eden";
 import { toast } from "sonner";
 import { Button } from "./ui/button";
+import { useQueryClient } from "@tanstack/react-query";
+import { Item, ItemActions, ItemDescription, ItemTitle } from "./ui/item";
 
 export function SyncButton() {
+  const query = useQueryClient();
   return (
-    <Button
-      onClick={async () => {
-        toast.promise(
-          client.api.sync.post().then((data) => console.log(data)),
-          {
-            loading: "Syncing...",
-            success: "Synced!",
-            error: "Sync failed",
-          },
-        );
-      }}
-    >
-      Sync
-    </Button>
+    <Item className="px-0 justify-between">
+      <ItemDescription>Sync your data</ItemDescription>
+      <ItemActions>
+        <Button
+          onClick={async () => {
+            toast.promise(
+              (async () => {
+                await client.api.sync.post();
+                query.invalidateQueries();
+              })(),
+              {
+                loading: "Syncing...",
+                success: "Synced!",
+                error: "Sync failed",
+              },
+            );
+          }}
+        >
+          Sync
+        </Button>
+      </ItemActions>
+    </Item>
   );
 }

web/src/components/ui/main-content.tsx

@@ -0,0 +1,11 @@
+import { cn } from "#/lib/utils";
+
+export function MainContent({
+  children,
+  className,
+}: {
+  children: React.ReactNode;
+  className?: string;
+}) {
+  return <main className={cn("min-h-screen p-8", className)}>{children}</main>;
+}

web/src/components/ui/section.tsx

@@ -0,0 +1,25 @@
+import { cn } from "#/lib/utils";
+
+export function Section({
+  className,
+  children,
+}: {
+  className?: string;
+  children: React.ReactNode;
+}) {
+  return <section className={cn("", className)}>{children}</section>;
+}
+
+export function SectionTitle({
+  children,
+  className,
+}: {
+  children: React.ReactNode;
+  className?: string;
+}) {
+  return (
+    <h2 className={cn("font-heading text-base font-medium", className)}>
+      {children}
+    </h2>
+  );
+}

web/src/routes/index.tsx

@@ -1,4 +1,5 @@
 import { SyncButton } from "#/components/sync-button";
+import { MainContent } from "#/components/ui/main-content";
 import { UserInfo } from "#/components/user-info";
 import { createFileRoute } from "@tanstack/react-router";
 
@@ -6,9 +7,9 @@ export const Route = createFileRoute("/")({ component: App });
 
 function App() {
   return (
-    <main>
+    <MainContent>
       <UserInfo />
       <SyncButton />
-    </main>
+    </MainContent>
   );
 }