Delete row sig_2746c18a2ed3 from signals

id sig_2746c18a2ed3
event_id evt_e4f5c3521162
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_4edcfa373 ...
dedupe_key signal_enriched:news_delta:24df8f32d4dd3f14
throttle_s 0
created_at 2026-04-22T11:31:53.817276+00:00
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