Delete row sig_2af297b99231 from signals

id sig_2af297b99231
event_id evt_438ddbf4f3b2
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_ce84a2a2f ...
dedupe_key signal_enriched:news_delta:c7077a6933a53339
throttle_s 0
created_at 2026-04-18T06:45:03.012156+00:00
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