Delete row sig_c9ad901618f2 from signals

id sig_c9ad901618f2
event_id evt_f75df0395d11
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_87b8dfd0e ...
dedupe_key signal_enriched:news_delta:2f04fce297ab53f9
throttle_s 0
created_at 2026-04-11T14:22:55.844294+00:00
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