Delete row sig_126c42ce1779 from signals

id sig_126c42ce1779
event_id evt_6a3931f11bc3
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_0e1e105e3 ...
dedupe_key signal_enriched:news_delta:1b57a110e0cd902f
throttle_s 0
created_at 2026-04-19T18:00:50.026723+00:00
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