Delete row sig_c9d0d97ff002 from signals

id sig_c9d0d97ff002
event_id evt_f209182d1968
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_7e92ceac4 ...
dedupe_key signal_enriched:news_delta:c802738448f658c4
throttle_s 0
created_at 2026-04-14T06:16:11.015566+00:00
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