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Clarify __NEOFS__EXPIRATION_EPOCH semantics in object expiration spec #116

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roman-khimov merged 3 commits into from
May 15, 2026
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Clarify __NEOFS__EXPIRATION_EPOCH semantics in object expiration spec #116

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Copilot May 14, 2026
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docs: clarify when __NEOFS__EXPIRATION_EPOCH takes effect
Copilot May 14, 2026
6cf92e4
docs: use clearer epoch end wording in expiration section
Copilot May 14, 2026
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2 changes: 1 addition & 1 deletion 03-storage/10-expiration.md
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### Object Expiration

In NeoFS, Objects may have an "expiration date". When an Object expires, it is marked for deletion and isn't available anymore. There is a well-known `__NEOFS__EXPIRATION_EPOCH` attribute which specifies the expiration date. Only a Regular Object may expire.
In NeoFS, Objects may have an "expiration date". When an Object expires, it is marked for deletion and isn't available anymore. There is a well-known `__NEOFS__EXPIRATION_EPOCH` attribute which specifies the expiration date: the Object remains available throughout that epoch and expires after it ends. Only a Regular Object may expire.

A Tombstone object is created upon Regular Object or Storage Group deletion. Every Tombstone object has the `__NEOFS__EXPIRATION_EPOCH` attribute as well. Thereby Storage Engine is able to filter Tombstones and select ones for total cleanup.

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