Replace SELECT-then-INSERT/UPDATE pairs in generate_articles() with
INSERT ... ON CONFLICT DO UPDATE statements, and wrap the entire loop in
a single transaction context manager. Eliminates ~1,500 individual SQLite
commits for a 500-article run (one commit per row replaced by one total).
Also fix _get_article_stats() returning None for live/scheduled/draft counts
when the articles table is empty: wrap SUM expressions in COALESCE(..., 0)
so they always return integers regardless of row count.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
482b4f9fca