Delete row sig_4b49f8bc7ff9 from signals

id sig_4b49f8bc7ff9
event_id evt_82ef9e257a20
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_101b3cb07 ...
dedupe_key signal_enriched:news_delta:036bb9d9b842ecbd
throttle_s 0
created_at 2026-04-17T21:07:05.664129+00:00
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