spoc-504: 5.x -> 6.x upgrade path and version safety nets#421

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Commits on May 8, 2026

patches: expose SpockCorePatchsetVersion from PG core

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spock: refuse to load against a mismatched core patchset

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sql: align extension upgrade chain with v5_STABLE

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spock: add node_version safety net in spock.local_node

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spock: model delta-apply columns as SECURITY LABELs

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spock: install ProcessUtility shim for 5.x->6.x binary upgrades

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tests: drive 5.x -> 6.x pg_upgrade via TAP

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tests: 002_create_subscriber: use sync_event/wait_for_sync_event

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Commits on May 12, 2026

Fix the upgrade test to be executed locally as well as inside a workflow
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