CREATE TABLE users (
  id TEXT PRIMARY KEY NOT NULL, -- supplied from google - not auto increment
  name TEXT NOT NULL,
  email TEXT NOT NULL UNIQUE,
  picture TEXT NOT NULL,
  grade_level INTEGER,
  teacher BOOLEAN NOT NULL,
  admin BOOLEAN NOT NULL,
  created_at DATETIME NOT NULL
);

CREATE TABLE tokens (
  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
  token TEXT NOT NULL UNIQUE,
  user_id TEXT NOT NULL REFERENCES users (id),
  created_at DATETIME NOT NULL
);

CREATE INDEX user_tokens ON tokens(user_id);