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A manual link merges two resources for display, and the durable identity pin was written from that merged identity. A link primary was pinned with the folded resource's machine key, and the store's one-owner-per-key rule then deleted the folded resource's own pin. A Proxmox node's pin records its qualified endpoint as the hostname, so on the next rebuild the node completed the linked agent's machine key from that pin, minted the agent's machine-derived ID and merged with the agent by ID before the link applied. With the node as primary, succession then rewrote the link into a self-link on the agent's ID; in either direction, removing the link left the pair merged. The registry now captures each link side's own pin when the link first joins it in a rebuild, and PersistIdentityPins writes those instead of the merged projection, keeping a pinnable folded side under its own canonical ID. Proxmox auto-links merge by identity before any manual link applies, so their boot-window pins are unchanged. A link side rewrites its whole row through a new ReplaceResourceIdentityPins. Like an upsert it keeps stored fields its own pin leaves empty, but it drops a strong key another resource holds, since an earlier release borrowed that key from the merged identity and the store's one-owner rule would otherwise delete one row or the other. A folded side drops a strong key a live resource or an earlier folded side already holds, so the two never trade it on every rebuild, and writes no pin when that would leave it without its machine evidence. A node row an earlier release filled with the agent's machine key is handed back only when the node cannot complete from it. With a qualified endpoint or a cluster name, completion still supplies the borrowed key before the link applies, so such a pair stays merged.