Delete row sig_b9e59176dd40 from signals

id sig_b9e59176dd40
event_id evt_5a3c5015c4d7
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_531ff8cb9 ...
dedupe_key signal_enriched:news_delta:f9d1e51d8ffb436b
throttle_s 0
created_at 2026-04-08T03:31:26.504113+00:00
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