One developer runs a real-time chess platform. Without writing the plumbing.

export const qConversations = (db: Db) =>
  db
    .query("conversation")
    .related("user_a", (q) => q.select("id", "username"))
    .related("user_b", (q) => q.select("id", "username"))
    .orderBy("last_message_ms", "desc")
    .build();

const conversations = createQuery(() => qConversations(db), {
  enabled: () => !!auth.userId(),
  deregisterOnCleanup: true,
});

// Already newest first: the order is part of the live query.
return (
  <For each={conversations.data()}>
    {(c) => <ConversationRow conversation={c} />}
  </For>
);

// One local write. On screen now, synced after.
await db.create(draft.id, {
  conversation: toRecordId(convId),
  sender: toRecordId(myId),
  recipient: toRecordId(peerId),
  text,
  kind,
  created_ms: now,
});

-- Runs in the database for every new message,
-- whichever client or agent wrote it.
DEFINE EVENT bump_conversation ON TABLE message
  WHEN $event = "CREATE"
  THEN {
    LET $conv = (SELECT user_a, user_b, last_message_ms
      FROM ONLY $after.conversation);
    LET $members = [$conv.user_a, $conv.user_b];
    IF $after.sender IN $members
      AND $after.recipient IN $members {
      ...
      IF $at >= ($conv.last_message_ms ?? 0) {
        UPDATE $after.conversation SET
          last_message_text =
            string::slice($after.text, 0, 120),
          last_message_ms = $at,
          last_message_sender = $after.sender;
      };
    };
  };

static QueryBuilder conversationQuery(Sp00kyClient c) =>
    c
        .query('conversation')
        .related(
          'user_a',
          (q) => q.select(const ['id', 'username']),
        )
        .related(
          'user_b',
          (q) => q.select(const ['id', 'username']),
        );

await _spooky.db.friendship.create(Friendship(
  id: 'friendship:FS_${customAlphabet(_idAlphabet, 7)}',
  requester: me,
  addressee: _fullUserId(otherId),
  status: statusPending,
  created_at: DateTime.now().toUtc(),
  created_ms: DateTime.now().millisecondsSinceEpoch,
));

-- Club logos, post images and event covers.
-- Anyone may read; a signed-in user may write.
DEFINE BUCKET club_covers
  BACKEND "file:/buckets/club_covers"
  PERMISSIONS
    WHERE $action IN ['get', 'head', 'exists']
    OR ($auth != NONE AND $action IN ['put', 'delete']);

const upload = useFileUpload("club_covers");
...
// One key names both renditions: <key>_f.webp and <key>_t.webp.
const key = coverKeyFor(club().id);
const paths = coverPaths(key);
for (const [path, blob] of [
  [paths.full, full],
  [paths.thumb, thumb],
]) {
  await upload.upload(path, blob);
  if (upload.error()) throw upload.error();
}
// The club row stores only the key.
await updateClub(db, club().id, { cover_key: key });

// ClubCrest.jsx renders the thumbnail from that key
<BucketImage
  bucket="club_covers"
  path={coverThumbPath(club.cover_key)}
  alt=""
/>

schedules:
  game-sync:
    every: 1m
    backend: gamesync
    route: /syncGames
    forEach:
      query: >
        SELECT id FROM connection
        WHERE provider IN ['lichess', 'chesscom']
          AND sync_error = NONE
          AND (last_synced_at = NONE
            OR last_synced_at < time::now() - 15m)
          AND (sync_failed_at = NONE
            OR sync_failed_at < time::now() - 15m)
      key: id
    concurrency: skip
    retry: { max: 2, strategy: linear }
    quarantineAfter: 5

export async function pokeSync(db, connId) {
  await db.run(
    BACKEND,
    PATH,
    { connection: connId },
    { assignedTo: connId, delay: MANUAL_SYNC_DELAY_MS }
  );
}

apps:
  web:
    path: ../../apps/solid-app
  gamesync:
    path: ../../apps/gamesync-api
  gameanalysis:
    path: ../../apps/gameanalysis-api
  ...

pools:
  render:
    provider: hetzner
    machine:
      type: cx33
      fallbackTypes: [cx43, cpx32]
      locations: [fsn1, nbg1, hel1]
    min: 0
    max: 5
    autoscale: true
    idleTimeout: 1m
    recycle: job

spky deploy