Delete row sig_9c0c7af5640d from signals

id sig_9c0c7af5640d
event_id evt_1fc43bb2040a
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_9b5fe1a99 ...
dedupe_key signal_enriched:news_delta:02333800a02de491
throttle_s 0
created_at 2026-04-21T00:02:03.931783+00:00
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