Delete row sig_f3124815a4b9 from signals

id sig_f3124815a4b9
event_id evt_45638ec17630
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_08ea7ca11 ...
dedupe_key signal_enriched:news_delta:bbac0fef1d3374d4
throttle_s 0
created_at 2026-04-22T11:47:01.370795+00:00
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