Delete row sig_15b0372f556d from signals

id sig_15b0372f556d
event_id evt_a150040d6116
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_28d8442fd ...
dedupe_key signal_enriched:news_delta:10f36ed5680b1cdb
throttle_s 0
created_at 2026-04-08T09:22:55.045627+00:00
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