Redis sink example

The Redis sink is the common handoff from FerroFeed into analytics and replay systems. It writes normalized EmittedEvent payloads under session-keyed md:v1 streams.

[runtime]
ui = "none"
 
[[venues]]
id = "coinbase-btcusd"
exchange = "coinbase"
symbols = ["BTC-USD"]
channels = ["trades", "book"]
 
[[sinks]]
type = "redis"
url = "redis://127.0.0.1:6379"
key_prefix = "md:v1"

Each emitted record preserves the venue id, normalized exchange, symbol, exchange timestamp when supplied, local ingest timestamp, and typed event kind. Reader applications should treat the Redis payload as the serialized transport for the EmittedEvent API contract.

use ferro_feed::model::{EmittedEvent, EventKind};
 
fn handle(event: EmittedEvent) {
    if let EventKind::Trade(trade) = event.event.kind {
        println!(
            "{} {} {} @ {}",
            event.venue_id,
            event.event.symbol,
            trade.qty,
            trade.price
        );
    }
}