Miningcore database on raven
### Description

networkdifficulty field in shares table isn't the same as the actual raven's network difficulty, its exponentially higher in this table, for example the current raven networkdifficulty is 18231.18, but listed in this field as 4994979.33200073

### Steps to Reproduce

compare current network difficulty to networkdifficulty field in shares table

### Expected behavior

field networkdifficulty data to match actual networks difficulty 

### Actual behavior

shows a much higher value

### Reproduces how often

100%

### Version

miningcore-0.24