Delete row sig_2a9ad256a2b1 from signals

id sig_2a9ad256a2b1
event_id evt_beb107de7364
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_f974130ef ...
dedupe_key signal_enriched:news_delta:b090c346989fdef3
throttle_s 0
created_at 2026-04-11T12:02:41.924184+00:00
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