created clients table SQL

Author: kaitlinnleung

server/db/schema/clients.sql

@@ -0,0 +1,9 @@
+CREATE TYPE client_role AS ENUM ('payee', 'instructor');
+
+CREATE TABLE clients (
+  id INT PRIMARY KEY UNIQUE NOT NULL DEFAULT nextval('client_id_seq'),
+  event_id INT REFERENCES events(id) NOT NULL,
+  role client_role NOT NULL,
+  name VARCHAR(256) NOT NULL,
+  email VARCHAR(256) NOT NULL
+);