bugfixes; research subproc; higher sandbox limits

deploy/k8s/dev/configs/ingestor-config.yaml

@@ -4,18 +4,32 @@
 flink_hostname: flink-jobmanager
 ingestor_broker_port: 5567
 
-# Supported exchanges (subscribe to these prefixes)
+# Supported exchanges (used for symbol metadata generation)
 supported_exchanges:
   - BINANCE
   - COINBASE
   - KRAKEN
 
+# Per-exchange work slot capacity.
+# Each slot is one concurrent job. historical_slots limits parallel OHLC fetches;
+# realtime_slots limits concurrent tick subscriptions. Set based on exchange rate
+# limits and connection constraints — these are conservative starting values.
+exchange_capacity:
+  BINANCE:
+    historical_slots: 1
+    realtime_slots: 5
+  COINBASE:
+    historical_slots: 1
+    realtime_slots: 4
+  KRAKEN:
+    historical_slots: 1
+    realtime_slots: 3
+
 # Kafka configuration
 kafka_brokers:
   - kafka:9092
 
 # Worker configuration
-max_concurrent: 10
 poll_interval_ms: 10000
 
 # Logging