Expand synthetic data across S&P 500

Add S&P 500 symbol list and expand synthetic options/equities feeds with varied contracts, sizes, and bursts to keep alerts firing.

services/ingest-equities/src/adapters/synthetic.ts

@@ -1,22 +1,40 @@
-import type { EquityPrint } from "@islandflow/types";
+import { SP500_SYMBOLS, type EquityPrint } from "@islandflow/types";
 import type { EquityIngestAdapter, EquityIngestHandlers } from "./types";
 
 type SyntheticEquitiesAdapterConfig = {
   emitIntervalMs: number;
 };
 
-const buildSyntheticPrint = (seq: number, now: number): EquityPrint => {
+const EXCHANGES = ["NYSE", "NASDAQ", "ARCA", "BATS", "IEX", "TEST"];
+
+const hashSymbol = (value: string): number => {
+  let hash = 0;
+  for (let i = 0; i < value.length; i += 1) {
+    hash = (hash * 31 + value.charCodeAt(i)) >>> 0;
+  }
+  return hash;
+};
+
+const buildSyntheticPrint = (
+  seq: number,
+  now: number,
+  symbol: string,
+  price: number,
+  size: number,
+  exchange: string,
+  offExchangeFlag: boolean
+): EquityPrint => {
   return {
     source_ts: now,
     ingest_ts: now,
     seq,
-    trace_id: `ingest-equities-${seq}`,
+    trace_id: `synthetic-equities-${seq}`,
     ts: now,
-    underlying_id: "SPY",
-    price: 450.1,
-    size: 100,
-    exchange: "TEST",
-    offExchangeFlag: false
+    underlying_id: symbol,
+    price,
+    size,
+    exchange,
+    offExchangeFlag
   };
 };
 
@@ -35,10 +53,21 @@ export const createSyntheticEquitiesAdapter = (
           return;
         }
 
-        seq += 1;
         const now = Date.now();
-        const print = buildSyntheticPrint(seq, now);
-        void handlers.onTrade(print);
+        const batchSize = 3;
+
+        for (let i = 0; i < batchSize; i += 1) {
+          seq += 1;
+          const symbol = SP500_SYMBOLS[(seq + i) % SP500_SYMBOLS.length];
+          const symbolHash = hashSymbol(symbol);
+          const basePrice = 25 + (symbolHash % 475);
+          const price = Number((basePrice + ((seq % 40) - 20) * 0.05).toFixed(2));
+          const size = 10 + (seq % 600);
+          const exchange = EXCHANGES[(seq + symbolHash) % EXCHANGES.length];
+          const offExchangeFlag = (seq + i) % 6 === 0;
+          const print = buildSyntheticPrint(seq, now + i * 4, symbol, price, size, exchange, offExchangeFlag);
+          void handlers.onTrade(print);
+        }
       };
 
       timer = setInterval(emit, config.emitIntervalMs);