Add interactive SSH portfolio features

test/database.test.js

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+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { PortfolioDatabase } from '../src/database.js';
+
+test('database rate-limits posts and stores leaderboard scores', t => {
+  const directory = fs.mkdtempSync(path.join(os.tmpdir(), 'ssh-portfolio-'));
+  const db = new PortfolioDatabase(path.join(directory, 'test.sqlite'));
+  t.after(() => { db.close(); fs.rmSync(directory, { recursive: true, force: true }); });
+  assert.equal(db.addBoardPost({ author: 'visitor', body: 'hello', ip: '127.0.0.1', now: 100000 }).ok, true);
+  assert.match(db.addBoardPost({ author: 'visitor', body: 'again', ip: '127.0.0.1', now: 100001 }).reason, /wait/);
+  assert.equal(db.listBoardPosts()[0].body, 'hello');
+  db.addScore('flappy', 'visitor', 3);
+  db.addScore('flappy', 'visitor', 7);
+  assert.equal(db.getLeaderboard('flappy')[0].score, 7);
+  assert.equal(db.getPlayerBest('flappy', 'visitor'), 7);
+});