Add Ticker24h support: hourly market snapshots with USD-normalized volume filtering

flink/src/main/resources/topics.yaml

@@ -28,6 +28,16 @@ topics:
       compression.type: snappy
       cleanup.policy: delete
 
+  # 24-hour rolling ticker snapshots for all symbols on an exchange.
+  # Written by ingestors on TICKER_SNAPSHOT requests; consumed by Ticker24hConsumer.
+  - name: market-ticker
+    partitions: 3
+    replication: 2
+    config:
+      retention.ms: 7200000  # 2 hours (hourly refresh; keep one backup)
+      compression.type: snappy
+      cleanup.policy: delete
+
   # Symbol metadata from ingestors
   - name: symbol-metadata
     partitions: 3