# Make SafetyWindow a Parameter
## What problem does this solve?
During a recent chain halt, we skipped making SafetyWindow a parameter to reduce risk and expedite recovery. We fixed it at 50. The problem: 
- Most urgently, this broke our integration tests, because there was no way to override the value, breaking all CPoC Integration tests because Epochs are shorter than 50 blocks for testing, meaning no CPoC ever executes
- Secondarily, but also important, this puts an important value impacting chain execution under proper governance control.

## How do you know this is a real problem?
Currently there are at least 4 failing integration tests, obscuring our ability to verify other code problems.

## How does this solve the problem?
- Add a new parameter to EpochParameters for SafetyWindow (default to 50, per the current value)
- Remove the hard coded value
- Fix tests to override this to 0

## What risks does this introduce? How can we mitigate those risks?
- There is very little risk, but an upgrade issue would be caught via testnet update testing, done for every upgrade.

## How do you know this PR fixes the problem?
Integration Tests now pass when they failed.