Executive compensation from DEF 14A proxy statements.

Returns cached data from PostgreSQL (stale-while-revalidate). If no cached data exists, or the cache is >90 days old, triggers a background fetch from SEC EDGAR and returns whatever is currently stored.

Response shape: { ticker: str, filing_date: str, accession: str, cached_at: str | null, executives: [ { name: str, title: str | null, years: [ { year, salary, bonus, stock_awards, option_awards, non_equity_incentive, pension_change, all_other, total } ] } ], source: "cache" | "fresh" | "background_fetch_triggered" }