CREATE TABLE users (
  id BIGSERIAL           PRIMARY KEY,
  email TEXT             NOT NULL UNIQUE,
  password TEXT          NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE refresh_tokens (
  id          BIGSERIAL    PRIMARY KEY,
  user_id     BIGINT       NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token_hash  TEXT         NOT NULL UNIQUE,
  created_at  TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
  expires_at  TIMESTAMPTZ  NOT NULL DEFAULT NOW()
);

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