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    "Dates in API responses show the wrong month: a note created on 15 March shows as 2026-02-15. Fix it and add a test.",
    "Add pagination to GET /notes. Accept query params page (default 1) and pageSize (default 5, max 50), and respond with { items, page, pageSize, total }. Update the tests.",
    "Create src/middleware/rateLimit.js exporting createRateLimiter({ limit, windowMs, now = Date.now }). It returns a function allow(key) that returns true for at most limit calls per key in each fixed window of windowMs (windows start at multiples of windowMs), and false after that. Add tests."
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      "finalMessage": "I added `createRateLimiter` in `src/middleware/rateLimit.js`, with tests in `tests/rateLimit.test.js`. The full suite passes (57 tests).\n\n`allow(key)` returns `true` for the first `limit` calls per key in the current fixed window, then `false`. The window is `floor(now() / windowMs)`, so windows start at multiples of `windowMs`. When a new window begins, the previous window's counts are discarded so the map doesn't keep growing.\n\nThe new tests cover:\n- the limit being enforced\n- keys being counted independently\n- the reset at exactly the window boundary (999 ms is still the old window, 1000 ms starts a new one)\n- the default `Date.now` clock\n\nI haven't wired the limiter into the server and haven't committed anything.",
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      "finalMessage": "I added `createRateLimiter({ limit, windowMs, now = Date.now })` in `src/middleware/rateLimit.js`. The full suite passes (60 tests).\n\nIt returns `allow(key)`, which counts calls per key within the window `floor(now() / windowMs)`. It returns `true` until a key reaches `limit` and `false` after that. Windows start at multiples of `windowMs`, not at the first call. When a new window begins, all counts are dropped, so keys from old windows don't pile up in memory.\n\nThe tests in `tests/rateLimit.test.js` use a fake clock. They cover the limit, independent keys and the reset at the window boundary (999 ms rejected, 1000 ms allowed). They also check that windows are aligned to multiples rather than the first call, that a skipped window carries nothing over, that `limit: 0` rejects everything, and that the limiter defaults to `Date.now`.\n\nI haven't wired the limiter into the server, since you only asked for the module. Nothing is committed.",
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