Delete row sig_2cf45645ee93 from signals

id sig_2cf45645ee93
event_id evt_df8e77acf9a5
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_ab0f31e65 ...
dedupe_key signal_enriched:news_delta:e99594e95e1451af
throttle_s 0
created_at 2026-04-20T17:59:52.170340+00:00
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