Add descriptions and usage information to each pattern associated with the repo. This would help developers to easily reference and understand the particular pattern, and decide whether or not to apply it.

https://github.com/robertsimoes/Solidity-Contract-Patterns/blob/master/IndexedStructMap/IndexedStructMap.sol
If I was u, I would develop update and add as one function, for example using

mapping(uint => address)

and have uint size; and write 2 maps and size in 1 struct;
something like this:

struct eDataStruct {
mapping(address => Entity) entityStructs;
mapping(uint=>address) entityList;
uint size;
}
struct Entity { 
    uint eData; 
    bool exists; 
  } 

Either the modifier body is missing or I am completely missing the point right now :)

https://github.com/robertsimoes/Solidity-Contract-Patterns/blob/34bd92f5481669358872c2c676cc8d025010c8b8/CircuitBreaker/CircuitBreaker.sol#L16