# Postgres as a messaging app

Here is a funny idea I came up with : using postgres to make an instant
messaging app. 

## The tables

First create a basic user table:

    CREATE TABLE users (
        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
        username VARCHAR
    );

Then create a conversation table:

    CREATE TABLE conversation (
        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
        name VARCHAR
    );

And a participant table:

    CREATE TABLE participant (
        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
        user_id UUID REFERENCES users(id),
        conversation_id UUID REFERENCES conversation(id)
    );

Then a message table :

    CREATE TABLE message ( 
        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
        sender_id UUID REFERENCES participant(id),
        conversation_id UUID REFERENCES conversation(id),
        content VARCHAR
    );