Delete row sig_d7531095b043 from signals

id sig_d7531095b043
event_id evt_15611ae9a73f
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_ac86c122e ...
dedupe_key signal_enriched:news_delta:25a05844e9091515
throttle_s 0
created_at 2026-04-09T15:01:33.556414+00:00
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