The first epoch downloaded has incomplete data

[santi1234567]

Description

The first epoch downloaded when running goteth will allways have the PrevState.EmptyStateRoot() flag on. This means that this epoch will be stored with incomplete data on the database.

Example from phase0 but applies to all forks:

goteth/pkg/spec/metrics/state_phase0.go

Lines 40 to 46 in 3387cd4

	func (p *Phase0Metrics) PreProcessBundle() {
	if !p.baseMetrics.PrevState.EmptyStateRoot() && !p.baseMetrics.CurrentState.EmptyStateRoot() {
	p.GetInclusionDelayDeltas()
	p.GetMaxAttComponentDeltas()
	}
	}

[santi1234567]

A possible solution (and probably easiest) is to start downloading from the epoch before the set one. This would require handling the case of epoch 0 as an exception. When running on finalized mode, this might be problematic and should be handled with special care.

Update: This won't work since it would overwrite the value from the epoch before