Delete row sig_c97f5e9af7b3 from signals

id sig_c97f5e9af7b3
event_id evt_6348fcb15463
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_779019070 ...
dedupe_key signal_enriched:news_delta:1e91436b6a5d0ace
throttle_s 0
created_at 2026-04-17T07:28:43.995436+00:00
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