re-attempt DB fetch connection

Classes/DataBaseHandler/DBHandler.m

@@ -578,9 +578,27 @@ classdef DBHandler < handle
             execute(obj.conn, query);
         end
 
+
         function answer = fetch(obj, query)
+            maxFast = 20; maxSlow = 30;
+            for attempt = 1:maxSlow
+                try
                     answer = fetch(obj.conn, query);
+                    return
+                catch ME
+                    if attempt < maxFast
+                        pause(1)
+                    else
+                        pause(10)
                     end
+                    lastErr = ME;
+                end
+            end
+            pause(60)
+            error('Database fetch failed after %d attempts:\n%s', maxSlow, lastErr.getReport())
+        end
+
+
 
         function [result,query] = queryDB(obj, filterParams, selectedFields)
             % getPathsWithFlexibleFilter Retrieves values from Runs table with flexible filtering