Delete row sig_c4a3a279ccc9 from signals

id sig_c4a3a279ccc9
event_id evt_83c0cfdbc7ab
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_ef3a586d6 ...
dedupe_key signal_enriched:news_delta:2da72e66097b26da
throttle_s 0
created_at 2026-04-13T04:20:09.058251+00:00
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