Delete row sig_97056c5c1aec from signals

id sig_97056c5c1aec
event_id evt_4de6b04a6a59
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_1d33b4397 ...
dedupe_key signal_enriched:news_delta:f2408769bd83af4b
throttle_s 0
created_at 2026-04-18T00:39:16.698222+00:00
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