swh-journal: Complete missing snapshot insertion event from storage to journal
Most of the events are installed except for the snapshot (which came later).
Adaptations needed:
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install the current trigger in the storage db
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update the storage listener to subscribe (storage subscriber) to this event and push the identifier in the kafka topic (kafka producer) [2]
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update the reifier layer which as a first approximation will fetch those new id and reify naively the full snapshot (some are huge) [3]
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[1] sql/70-swh-trigger.sql
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[2] swh.storage.listener
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[3] swh.journal.publisher
Migrated from T1275 (view on Phabricator)