message: fix: specify VARCHAR size when loading examples
diff: @@ -37,8 +37,8 @@ JSON_KEYS = {"params", "template_params", "extra"}
  type_map = {
  - "VARCHAR": String(),
  - "STRING": String(),
  + "VARCHAR": String(255),
  + "STRING": String(255),
  "TEXT": Text(),
  "BIGINT": BigInteger(),
  "FLOAT": Float(),
  