bug: no alerting when nightly crawl returns 0 campaigns (silent HTML parse failure)

[Jing-yilin]

Problem

parseDiscoverPageHTML relies on Kickstarter's [data-project] JSON data attribute. Kickstarter is a React SPA and its HTML structure can change without notice. If the attribute disappears, the parser silently returns an empty slice; the AI fallback may also fail. The nightly cron logs the count but there is no alert or metric that fires when 0 campaigns are upserted for a category.

// kickstarter_parser.go
doc.Find("[data-project]").Each(func(i int, s *goquery.Selection) {
    // if this selector matches nothing, campaigns == []
})
// Fallback to HTML structure parse — also fragile
if len(campaigns) == 0 {
    campaigns = parseFromHTMLStructure(doc)
}

// cron.go — only logs, never alerts
if len(campaigns) == 0 {
    break
}

Expected Behaviour

• If a full crawl run upserts fewer than N campaigns total (e.g. < 50), emit a structured error log or push an internal alert
• Distinguish between "category has 0 live campaigns" and "parsing failed"

Proposed Fix

• Add a post-crawl sanity check: if upserted == 0 across all categories, log ERROR (not just INFO)
• Optionally track consecutive zero-result runs and surface them in a health endpoint