Delete row sig_3a8f4c8b7f52 from signals

id sig_3a8f4c8b7f52
event_id evt_c49d8a2a74a2
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_3fe10d187 ...
dedupe_key signal_enriched:news_delta:e755b59dd84ef488
throttle_s 0
created_at 2026-04-12T12:39:09.352370+00:00
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