tvdatafeed VS graph-node

I've been working on a Python library which lets the user retrieve data from TradingView.com so it could be used in backtesting a strategy. The project is called TvDatafeedLive and is available on GitHub. To be fair, the project is actually an extension of a project called TvDatafeed, which is a really good project, but only supports retrieving historic data (so far). So, I've taken the liberty to fork it and implement retrieving data continously and "real-time". The data is retrieved in Pandas DataFrames and can easily be plugged into backtrader. There is instructions included in the GitHub page. If this sounds interesting then please check it out and leave feedback if there are any thoughts.

just did a quick search for you, first pass returned this on github https://github.com/StreamAlpha/tvdatafeed but be aware I have NOT looked into it or done anything other than read to description, it could be all scammy as fuck I dunno, so recommend you just check it out and anti others that are similar, and see if maybe they can't give you some inspiration on how to go about coding exactly what you want. good luck!

Event is a log entity which EVM smart contracts can emit during transaction execution. Events are very good at signalling that an some action has taken place on-chain. Applications can subscribe and listen to events to trigger some off-chain logic or they can index, transform and store events in some off-chain storage (look at The Graph protocol or Ethereum ETL).

Subgraph cloned from repo :https://github.com/graphprotocol/graph-node/tree/master/docker

https://github.com/scaffold-eth/scaffold-eth-2 this repo comes with wagmi and hard hat preconfigured you can use it as a sample , but if you are large querying data I would advise you the graph https://thegraph.com/

The Graph

There are also decentralized network services like The Graph or Pocket Network that provide decentralized access to Ethereum and other blockchain networks. Note that these services primarily provide APIs for querying blockchain data, and may not provide full functionality for sending transactions or executing smart contracts like a full Ethereum node or services like Infura and Alchemy.

Yes, you can. You'll have to run your own graph-node See: https://github.com/graphprotocol/graph-node

If you only looking to index events of a couple contracts you can use https://thegraph.com to deploy a sub graph for fetching real time data form those contracts

First lets see this repo StoreFront_contracts This project is build with hardhat and also has TheGraph powered indexer in subgraph. The project provides NFT based smart contract like ERC721 build on top of openzeppelin contracts.

Does blockchain tech replace the backend? Absolutely...Not 👀 As I said, web3 is an addition, supplementary and will not replace existing tech. In major blockchain applications, getting data from smart contracts can cost time and sometimes fail if the RPC is unresponsive. You would still want a database and API to query data collected from smart contracts from, say, events. Examples: The Graph, Moralis.

Before you continue, I'm assuming you know what The Graph is and what problems it tackles. If you haven't, I highly recommend checking out - Why The Graph.