This PR implements flat-file storage for finalized block access lists,
specifically:
* The freezer is extended with the notion of tail groups, allowing
different groups within a single freezer instance to maintain
independent tails, while all tables within the same group remain
tail-aligned.
* The freezer can now dynamically attach new tables to an existing
freezer instance, with both the table head and tail initialized to the
freezer's common head.
* A new freezer table, **bals**, has been added to the chain freezer
with its own dedicated tail group, preserving the flexibility to deploy
a tail-pruning policy different from the main chain data group.
Additionally, the BALs in the key-value store will be migrated to the
freezer instance once they are finalized or there are at least 90K block
confirmations on top acting as a "soft finalization". This freezing
policy is same with all chain segment data.
Fixes https://github.com/ethereum/go-ethereum/issues/33907
Notably there is a behavioral change:
- Previously Geth will refuse to restart if the existing trienode
history is gapped with the state data
- With this PR, the gapped trienode history will be entirely reset and
being constructed from scratch
This implements a backing store for chain history based on era1 files.
The new store is integrated with the freezer. Queries for blocks and receipts
below the current freezer tail are handled by the era store.
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Co-authored-by: Gary Rong <garyrong0905@gmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>
Co-authored-by: lightclient <lightclient@protonmail.com>
