type Query {
    members: [Member]
    member(id: String!): Member
}

type Member {
    id: String!
    reputation: Int!
    ledger: [LedgerEntry]
}

type LedgerEntry {
    timestamp: String
    type: String
    postId: String
    citationId: String
    change: Int
    balance: Int
}

type Mutation {
    createMember(id: String): Member  
    postRep(
        memberId: String!, 
        postId: String!, 
        amount: Int!
    ): LedgerEntry
    citationRep(
        memberId: String!, 
        postId: String!, 
        citationId: String!, 
        amount: Int!
    ): LedgerEntry
}