-- Комментарии к заявкам (внутренние и с жителем)
CREATE TABLE IF NOT EXISTS application_comments (
  id             BIGSERIAL PRIMARY KEY,
  application_id BIGINT NOT NULL REFERENCES applications(id) ON DELETE CASCADE,
  author_name    TEXT NOT NULL,
  type           VARCHAR(20) NOT NULL DEFAULT 'internal',
  text           TEXT NOT NULL,
  created_at     TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_application_comments_app ON application_comments(application_id);
CREATE INDEX IF NOT EXISTS idx_application_comments_type ON application_comments(type);

-- История изменений заявки
CREATE TABLE IF NOT EXISTS application_history (
  id             BIGSERIAL PRIMARY KEY,
  application_id BIGINT NOT NULL REFERENCES applications(id) ON DELETE CASCADE,
  changed_by     TEXT NOT NULL,
  changed_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  field_name     TEXT NOT NULL,
  old_value      TEXT,
  new_value      TEXT
);

CREATE INDEX IF NOT EXISTS idx_application_history_app ON application_history(application_id);