It can be used in giveaways and crowdfunding where a random needy person can be supported. Usually randomness cannot be generated on-chain because this data can be easily used to manipulate the smart contract that we have deployed. Thats
I faced challenges while defining entities for my subgraph, also checking for all connections i.e. the smart contract, subgraph and the frontend left room for a lot of bugs.
It was very tedious to solve this bugs and getover them.
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Polygon Technology
Chainlink
The Graph
QuickNode
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