Delete row sig_97f4a9e16199 from signals

id sig_97f4a9e16199
event_id evt_55c0a1cf8074
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_f9bcd7f70 ...
dedupe_key signal_enriched:news_delta:5a97efa6ae17368a
throttle_s 0
created_at 2026-04-20T13:34:06.848208+00:00
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