Delete row sig_4c8a1c9f03e2 from signals

id sig_4c8a1c9f03e2
event_id evt_d3c000be9d4c
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_af59a9eb7 ...
dedupe_key signal_enriched:news_delta:16cab2a9553f410b
throttle_s 0
created_at 2026-04-17T04:27:43.980573+00:00
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