bugfixes; research subproc; higher sandbox limits

ingestor/src/realtime-poller.js

@@ -18,6 +18,10 @@ export class RealtimePoller {
 
     this.pollingLoop = null;
     this.heartbeatLoop = null;
+
+    // Called with (jobId, error) when a subscription terminates abnormally.
+    // Set by IngestorWorker to release the slot in SlotPool.
+    this.onJobComplete = null;
   }
 
   /**
@@ -147,6 +151,7 @@ export class RealtimePoller {
         } catch (zmqErr) {
           this.logger.error({ jobId, error: zmqErr.message }, 'Failed to send WorkComplete after error');
         }
+        if (this.onJobComplete) this.onJobComplete(jobId, error);
       }
     }
   }