Error: "Share persistence queue backlog has crossed 1024"
### Description

Shares and blocks not being reported to the DB (running multiple pools connecting to the same DB)
Error: "Share persistence queue backlog has crossed 1024"

### Steps to Reproduce

1. Run the pool
2. See all the rigs connecting
3. Share persistence queue backlog has crossed 1024

### Expected behavior

Shares registered for each miner, blocks registered and updating

### Actual behavior

Shares/s drops down, blocks not being reported

### Reproduces how often

Once the error message comes up "Share persistence queue backlog has crossed 1024"
I restart the pool and same thing happens again

### Version
https://github.com/aionnetwork/aion_pool2/tree/master/aion_pool
Ubuntu 18.04 LTS"