fix(events): event index unique for tipset during backfill #12567
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This was left undone as part of the original fix for unique event indexes and shows up as a bug (e.g. "duplicate logIndex" for ETH APIs) where backfilling is involved.
I think this might also be implicated in the duplicate-events bugs we are seeing because we use the index in the "exists" check.
Ref: #11952
Ref: #12549