## Summary
This a port of the AgentHistoryItem DB Admin (GreenAdminDatabaseUnreachablePenalty reward) changes that were made to the PrimAITE Internal repo.
See also #2826.
## Test process
Updated tests/integration_tests/game_layer/test_rewards.py.
## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
#2748: Port of PrimAITE Internal changes.
Related work items: #2748
b7ef538942