Add index on ATXs that makes epoch ATX requests faster (#5618)

## Motivation Based on #5591, it appears that epoch ATX SQL requests can be made faster by adding another index on ATXs
spacemeshos · Feb 28, 2024 · 432019e · 432019e
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commit 432019e
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diff --git a/sql/migrations/state/0014_atxs_extra_index.sql b/sql/migrations/state/0014_atxs_extra_index.sql
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+-- retrieve epoch info faster
+CREATE INDEX atxs_by_epoch_id on atxs (epoch, id);