Summary

Informational

[I-1] Event is missing indexed fields

Vulnerability Details

Index event fields make the field more quickly accessible to off-chain tools that parse events. 

Impact

NC - informational

Tools Used

aderyn, vscode

Recommendations

Each event should use three indexed fields if there are three or more fields, and gas usage is not particularly of concern for the events in question. If there are fewer than three fields, all of the fields should be indexed.
However, note that each index field costs extra gas during emission, so it's not necessarily best to index the maximum allowed per event (three fields).