Delete row sig_a3ee3019f7b5 from signals

id sig_a3ee3019f7b5
event_id evt_586f666597fc
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_843337916 ...
dedupe_key signal_enriched:news_delta:a4ab3f3e7226bd21
throttle_s 0
created_at 2026-04-17T14:05:36.989276+00:00
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