Delete row sig_b300615ebb60 from signals

id sig_b300615ebb60
event_id evt_91695d5abc30
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_9369649ef ...
dedupe_key signal_enriched:news_delta:1fa2136f578a6804
throttle_s 0
created_at 2026-04-09T17:20:48.809402+00:00
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