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Object table
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Rename version table to object table
In value handle the different versions
So that the table becomes (bucket, key) -> CRDT(list of versions)
CRDT merge rule:
- keep one complete version (the one with the highest timestamp)
- keep all incomplete versions with timestamps higher than the complete version
Cleanup rule: remove incomplete versions after a given delay (say 24h)
Block table
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Table is version_UUID -> BTreeMap<(offset, block hash)> OR Deleted (= CRDT top)
Block reference table
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Table is block_Hash + Sort key: version_UUID -> boolean (true when deleted)
Since the hash key is the same as for the blocks themselves,
we can simply consider the updates to this table as events that increase/decrease a reference counter.
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