add "clickhouse is healthy" check

src/events.test.ts

@@ -9,14 +9,35 @@ const twoHourAgo = dateFns.format(
   "yyyy-MM-dd hh:mm:ss"
 );
 
+const now = dateFns.format(new Date(), "yyyy-MM-dd hh:mm:ss");
+
 describe("Events", () => {
+  test.only("clickhouse is healthy", async () => {
+    const { data } = await (
+      await clickhouseClient.query({
+        query: `
+        SELECT 
+          hostName() AS host, 
+          uptime() AS uptime_seconds, 
+          version() AS clickhouse_version, 
+          'OK' AS status
+        FROM system.tables
+        LIMIT 1;
+      `,
+      })
+    ).json();
+    const [{ status }] = data as any;
+    assert.equal(status, "OK");
+  });
   test("has inserted events", async () => {
+    const query = knex("events")
+      .count("")
+      .whereBetween("created_at", [twoHourAgo, now])
+      .toString();
+    console.log(query);
     const { data } = (await (
       await clickhouseClient.query({
-        query: knex("events")
-          .count("")
-          .where("created_at", ">", twoHourAgo)
-          .toString(),
+        query,
       })
     ).json()) as any;
     assert.notEqual(Number.parseInt(data[0]["count()"], 10), 0);