Delete row sig_3c7cafcedd33 from signals

id sig_3c7cafcedd33
event_id evt_065ee9a42185
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_f643ce8d7 ...
dedupe_key signal_enriched:news_delta:23a82602920c9fbf
throttle_s 0
created_at 2026-04-21T19:16:34.907753+00:00
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