Delete row sig_9d7b8bcb3f97 from signals

id sig_9d7b8bcb3f97
event_id evt_9de3fcde4174
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_46fd0507c ...
dedupe_key signal_enriched:news_delta:546b01a00b8addb5
throttle_s 0
created_at 2026-04-20T10:45:37.892537+00:00
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