CREATE TABLE users (
  id            TEXT PRIMARY KEY DEFAULT gen_random_uuid(),
  username      TEXT NOT NULL UNIQUE,
  password_hash TEXT NOT NULL,
  created_at    TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at    TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE refresh_tokens (
  id         TEXT NOT NULL DEFAULT gen_random_uuid(),
  user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token_hash TEXT NOT NULL,
  expires_at TIMESTAMP NOT NULL,
  revoked    BOOLEAN NOT NULL DEFAULT FALSE,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_refresh_tokens_user_id ON refresh_tokens(user_id);
CREATE INDEX idx_refresh_tokens_token_hash ON refresh_tokens(token_hash);