add explicit truncated message

Author: sujaypatil96

schematic/store/synapse.py

@@ -479,8 +479,11 @@ def associateMetadataWithFiles(self, metadataManifestPath: str,
 
                 # truncate annotation values to 500 characters if the
                 # size of values is greater than equal to 500 characters
+                # add an explicit [truncatedByDataCuratorApp] message at the end
+                # of every truncated message to indicate that the cell value
+                # has been truncated
                 if isinstance(v, str) and len(v) >= 500:
-                    v = v[0:499]
+                    v = v[0:472] + "[truncatedByDataCuratorApp]"
 
                 metadataSyn[keySyn] = v