Delete row sig_f5039d742744 from signals

id sig_f5039d742744
event_id evt_1a4179aa220d
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_ea1f934ac ...
dedupe_key signal_enriched:news_delta:a431efbaba8295c9
throttle_s 0
created_at 2026-04-20T09:44:04.748220+00:00
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