Delete row sig_2c81dccd19b6 from signals

id sig_2c81dccd19b6
event_id evt_057e5edf48a3
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_a0cdba144 ...
dedupe_key signal_enriched:news_delta:6677bf7f586c4b37
throttle_s 0
created_at 2026-04-18T08:15:50.229336+00:00
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