Delete row sig_97fd418476fa from signals

id sig_97fd418476fa
event_id evt_bd56d374e3d4
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_f9387b04d ...
dedupe_key signal_enriched:news_delta:09eec70fb67ff47b
throttle_s 0
created_at 2026-04-20T01:02:49.185391+00:00
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