* do not use batch for SaveAttestations
* use snappy compression
* Encode / decode everything with snappy
* Add snappy migration path
* batch is probably fine...
* fix test
* gofmt
* Merge branch 'master' of github.com:prysmaticlabs/prysm into remove-batch-attestations
* add sanity check
* remove that thing
* gaz
* Merge branch 'master' of github.com:prysmaticlabs/prysm into remove-batch-attestations
* progress on fixing #3947
* upsert after, but only if not already exists
* return an error in some case
* format
* handle case where there has not been any finality yet
* it works
* remove todo
* use variable with comments
* regression test
* revert off by one issue, fix tests
* rename receiver
* @nisdas pr feedback
* checkpoint progress
* feature flag and test
* return true if feature flag is not on
* add lint msg
* rollback tx if failure
* Revert validator/BUILD.bazel