No it's all custom stuff written from scratch, some in .NET Core, some in JavaScript (Cloudflare workers, Node.js client libs). I'm saving to flat files on Google Cloud Storage and Wasabi (S3 compatible alternative), given TBs of data it's much cheaper. Filtering is being done on demand. Regarding channels that heavily depends on exchange, you can use https://tardis.dev/api/v1/exchanges/:exchange API to get the list (eg. https://tardis.dev/api/v1/exchanges/bitmex)