text: 
  -- +goose Up
  -- SQL in section 'Up' is executed when this migration is applied
  ALTER TABLE posts MODIFY COLUMN problem TEXT;
  ALTER TABLE posts MODIFY COLUMN solution TEXT;
  ALTER TABLE posts MODIFY COLUMN lesson TEXT;
  
  -- +goose Down
  -- SQL section 'Down' is executed when this migration is rolled back
  ALTER TABLE posts MODIFY COLUMN problem TEXT NOT NULL;
  ALTER TABLE posts MODIFY COLUMN solution TEXT NOT NULL;
  ALTER TABLE posts MODIFY COLUMN lesson TEXT NOT NULL;
  