cisco90 opened a new issue, #21012:
URL: https://github.com/apache/superset/issues/21012

   I cannot save dashboard with position_json more long than "text" mariadb 
field
   
   #### How to reproduce the bug
   
    I create a dashboard that hit the default 
SUPERSET_DASHBOARD_POSITION_DATA_LIMIT, so i set it to 131070, after that the 
error change in `Data too long fo column 'json_metadata' at row 1` in superset 
logs.
   without changing json_metadata, only delete a couple of markdown element 
filled with text, it works
   I change manually the type on table superset.dashboard, column 
json_metadata, from `text` to `mediumtext` and it works perfectly.
   
   I think there is a check on field light based on wrong column type something 
like a comparison between position_json content length with json_metadata type 
(text in that case)
   
   ### Expected results
   
   Save dashboard that are longer than mariadb text type
   
   ### Actual results
   
   I cannot save dashboard that are longer than mariadb text type
   
   ### Environment
   
   (please complete the following information):
   
   - browser type and version:
   - superset version: `2.0` and also `1.4.2`
   - any feature flags active: SUPERSET_DASHBOARD_POSITION_DATA_LIMIT= 131070
   
   ### Additional context
   
   Add any other context about the problem here.
   


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