Delete row sig_97c85f14247d from signals

id sig_97c85f14247d
event_id evt_3a45c3d67534
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_4e2d7068b ...
dedupe_key signal_enriched:news_delta:fd8d9b8f437591f9
throttle_s 0
created_at 2026-04-22T11:31:53.845760+00:00
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