Delete row sig_0c9778e81172 from signals

id sig_0c9778e81172
event_id evt_f06917dc69ea
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_89e088967 ...
dedupe_key signal_enriched:news_delta:6eae5508875b3884
throttle_s 0
created_at 2026-04-12T17:40:32.584499+00:00
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