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Fix CardinalityViolation in grab_next_visits on duplicate origins

vlorentz requested to merge generated-differential-D6664-source into generated-differential-D6664-target

grab_next_visits grabs from listed_origins, whose primary key is (lister_id, url, visit_type) and uses it to upsert in origin_visit_stats, whose primary key is (url, visit_type). This causes the error ON CONFLICT DO UPDATE command cannot affect row a second time when the same (origin, type) pair is grabbed twice.

This commit deduplicates the (origin, type) pairs before upserting.

Resolves SWH-SCHEDULER-6A

Migrated from D6664 (view on Phabricator)

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