The Graph subgraph for the Curio Cards Wrapper smart contract

• This subgraph only supports wrapped cards
• Index all users who hold a specific card
• Index user balance for each card they hold
• (To Do) Retrieve ipfs data with Graph's ipfs support
• (Optional To Do) Index number of unique cards each holder has
• (Optional To Do) Index Sets balances same as Card balances

Unlike with erc721, erc1155 nfts can have multiple print holders. This creates a many-to-many relationship between cards and holders.

• Card
  • Card token ID number
  • metadata ipfs hash
  • wrapped balance
  • list of holders
• Holder
  • ethereum address
  • list of cards owned
    • Can be null if transferred away all previously owned cards
• HolderCardBalance
  • Many-to-many relationship mapping table
    • Cards can have many holders
    • Holders can have many cards
  • Balance of the holder's card