Delete row sig_2fb1e1eb7cca from signals

id sig_2fb1e1eb7cca
event_id evt_a0fb2c9cfdc0
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_bb70124fe ...
dedupe_key signal_enriched:news_delta:7a65734ccdfbdaf7
throttle_s 0
created_at 2026-04-08T06:20:03.082798+00:00
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