import time
from collections import OrderedDict


class DedupeTracker:
    def __init__(self, max_size: int = 2000, ttl_seconds: int = 300):
        self._cache: OrderedDict[str, float] = OrderedDict()
        self._max_size = max_size
        self._ttl = ttl_seconds

    def has(self, key: str) -> bool:
        if not key:
            return False
        if key in self._cache:
            return True
        self._expire()
        return key in self._cache

    def add(self, key: str) -> None:
        if not key:
            return
        self._expire()
        self._cache[key] = time.monotonic()
        self._cache.move_to_end(key)
        while len(self._cache) > self._max_size:
            self._cache.popitem(last=False)

    def _expire(self) -> None:
        now = time.monotonic()
        expired = [k for k, ts in self._cache.items() if now - ts > self._ttl]
        for k in expired:
            del self._cache[k]