Delete row sig_2c02c2011b64 from signals

id sig_2c02c2011b64
event_id evt_f4d4e84e4919
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_bf0960ab1 ...
dedupe_key signal_enriched:news_delta:4e1f5e8420217e4c
throttle_s 0
created_at 2026-04-21T00:52:49.470776+00:00
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