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node_id/page_id/user_id are lookup and ordering only -- all three
nullify on delete, so an entry outlives its actor and its subject.
Everything that must survive those deletions lives in a mandatory
metadata jsonb written once at creation: the actor's username, the
node's human-readable name (pinned to the default locale), and
action-specific extras such as publish's title from/to.
NodeAction.record! is the single constructor, so every entry gets
the same baseline metadata without each call site re-implementing
it. occurred_at is one field for live and backfilled entries alike;
inferred_from distinguishes them -- nil means witnessed at the
moment it happened, populated names how a backfilled entry was
estimated.
Instrumented so far: publish (crediting the actual publisher,
threaded through from the controller -- previously nobody had the
act of publishing recorded anywhere), revert's discard_autosave and
destroy_draft branches, and translation destroy. publish_draft! now
runs in a transaction so the promotion and its log entry land
together. The remaining verbs follow once this mechanism has proven
itself.
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