Delete row sig_3b604722b3f6 from signals

id sig_3b604722b3f6
event_id evt_ea1326fda3af
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_f16743ef7 ...
dedupe_key signal_enriched:news_delta:5bc21ecf9a041769
throttle_s 0
created_at 2026-04-07T06:14:48.482747+00:00
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