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origin_visit_add: Fix crash when adding multiple visits to the same origin simultaneously

vlorentz requested to merge generated-differential-D8250-source into generated-differential-D8250-target

This works by adding a RW lock on the row of the latest visit, which should block other transactions until the insertion is committed; so other transactions will generate a different (larger) visit id

This commit also slightly rewrites how the max visit id is computed, as we need to actually select a row to lock it, instead of using the max() aggregate function.

Resolves #4444 (closed).

Migrated from D8250 (view on Phabricator)

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