Delete row sig_44c1fdfb290c from signals

id sig_44c1fdfb290c
event_id evt_200ef42bff24
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_778464db6 ...
dedupe_key signal_enriched:news_delta:a2e053e7f3c070e2
throttle_s 0
created_at 2026-04-19T22:00:24.908847+00:00
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