There's two issues here:

The update_latest_snapshot task shouldn't be erroring this way. Also, when the error is saved to the template, the error is too long. The cause of this error should be investigated and the error needs to be shortened before set on the template, or the type should be changed.

seeing this error on glitchtip

ERROR: value too long for type character varying(255) (SQLSTATE 22001)\n[0.625ms] [rows:0] \n\t\t\tUPDATE templates\n\t\t\tSET last_update_snapshot_error = 'ERROR: insert or update on table \"templates_repository_configurations\" violates foreign key constraint \"fk_templates_repository_configurations_templates\" (SQLSTATE 23503)\