Postgres error on long message

[SimonLab]

The schema is using the string type value for the message which means for long message the value can't be saved and postgres returns an error:
https://github.com/dwyl/phoenix-liveview-chat-example/blob/f4812190ac7f9620a6244f91c00e1d2425170dae/priv/repo/migrations/20211122121548_create_messages.exs

We can either use a differnt type for the field:

https://hexdocs.pm/ecto_sql/Ecto.Migration.html#module-field-types

Or display an error on the client. It is easy to add a new migration to update the field type and I'm tempted to go in that direction