Delete row sig_28924d48695d from signals

id sig_28924d48695d
event_id evt_444db7512698
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_149ddd0eb ...
dedupe_key signal_enriched:news_delta:a00df4bcc2d62212
throttle_s 0
created_at 2026-04-10T14:15:34.378025+00:00
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