Implement server-backed live history

packages/storage/tests/equity-quotes.test.ts

@@ -4,6 +4,7 @@ import {
   EQUITY_QUOTES_TABLE,
   normalizeEquityQuote
 } from "../src/equity-quotes";
+import { fetchEquityQuotesBefore, type ClickHouseClient } from "../src/clickhouse";
 
 const baseQuote = {
   source_ts: 100,
@@ -27,4 +28,35 @@ describe("equity-quotes storage helpers", () => {
     expect(ddl).toContain(EQUITY_QUOTES_TABLE);
     expect(ddl).toContain("CREATE TABLE IF NOT EXISTS");
   });
+
+  it("fetches older quotes with tuple cursor ordering", async () => {
+    let queryText = "";
+    const client = {
+      query: async ({ query }: { query: string }) => {
+        queryText = query;
+        return {
+          async json<T>() {
+            return [
+              {
+                ...baseQuote,
+                source_ts: 90,
+                ingest_ts: 201,
+                seq: 2,
+                trace_id: "trace-2",
+                ts: 90
+              }
+            ] as T;
+          }
+        };
+      }
+    } as unknown as ClickHouseClient;
+
+    const rows = await fetchEquityQuotesBefore(client, 100, 3, 25);
+
+    expect(rows).toHaveLength(1);
+    expect(rows[0]?.trace_id).toBe("trace-2");
+    expect(queryText).toContain(EQUITY_QUOTES_TABLE);
+    expect(queryText).toContain("WHERE (ts, seq) < (100, 3)");
+    expect(queryText).toContain("ORDER BY ts DESC, seq DESC LIMIT 25");
+  });
 });