As collections and editions grow, retrieval functions become increasingly expensive and may exceed RPC gas limits. Frontends can become unable to query user holdings.

getUserMemorabiliaDetailed() performs:

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(https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L269)

https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L270

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resulting in: O(collections × items) complexity.

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The function scans every collection and every minted edition regardless of whether the user owns any of them.

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As the ecosystem grows, execution cost scales linearly with total protocol activity.

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A sufficiently large number of collections can make the function practically unusable.

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(https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L269)

https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L270

https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L271

https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L272

https://github.com/CodeHawks-Contests/2025-07-beatland-festival/blob/5034ccf16e4c0be96de2b91d19c69963ec7e3ee3/src/FestivalPass.sol#L273

As collections and editions grows and become large this is surely to happen.

Frontends can become unable to query user holdings.

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Store user-owned memorabilia directly and update ownership during minting/transfers.

mapping(address => uint256[]) ownedMemorabilia; + add this code