Error filtering by 'author' in dataset 'api.assessment'

[SergioZSZ]

Context
We are using DASHVerse at UPM to track the repos of our research group.

Describe the bug

When filtering by author in DashVERSE 0.2.0, the query fails with a PostgreSQL error instead of returning the filtered rows.

Example error:

Unexpected error
Error: invalid input syntax for type json
LINE 3: WHERE author = 'SergioZSZ' GROUP BY id, author 
                       ^
DETAIL:  Token "SergioZSZ" is invalid.
CONTEXT:  JSON data, line 1: SergioZSZ

I uploaded to DashVERSE DDBB by postgrest service a JSON-LD adding the keys '@id' and 'author' by my own, with the format:

      "@id": "https://github.com/SergioZSZ/Software-Quality-Observatory-Orchestrator-TFG/assessment/2026-04-16T11:18:46Z",
      "author": "SergioZSZ"

To Reproduce
Steps to reproduce the behavior:

1. Insert the example.json in DashVERSE DDBB
2. Go to a chart or dataset based on api.assessment.
3. Add a filter using (for example) author = 'SergioZSZ'.
4. Run the query.
5. See the error.

Expected behavior

The filter should work normally and return only the rows where author = 'oeg-upm', without raising a JSON syntax error.

I`m attaching an example JSON-LD that works to reproduce the error. Just try to filter it by author in api.assessment dataset to reproduce it.

json_example.json