-- users table
CREATE TABLE IF NOT EXISTS users (
  id BIGSERIAL PRIMARY KEY,
  provider TEXT NOT NULL,
  provider_user_id TEXT NOT NULL,
  username TEXT NOT NULL,
  display_name TEXT NULL,
  email TEXT NULL,
  avatar_url TEXT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  UNIQUE (provider, provider_user_id)
);

CREATE INDEX IF NOT EXISTS idx_users_provider ON users (provider, provider_user_id);