stugorf opened a new issue, #204:
URL: https://github.com/apache/age-website/issues/204

   Is there a way to create constraints for node/vertex properties? I want to 
use concurrent loading of AGE but need constraints to avoid multiple threads 
from creating duplicate nodes/vertex. I tried this:
   
   ```CREATE UNIQUE INDEX mesh_name_ids 
   ON pubmed."Article" 
   ((properties->>'pmid'));
   ```
   
   but I get this error: 
   ```
   operator does not exist: ag_catalog.agtype ->> unknown
   Hint: No operator matches the given name and argument types. You might need 
to add explicit type casts.
   ```
   
   Are constraints on a Node property possible?


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