Delete row sig_a3b248372ab4 from signals

id sig_a3b248372ab4
event_id evt_3744fb234b6e
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_7bf09105b ...
dedupe_key signal_enriched:news_delta:2a3a5c5d1a122ba3
throttle_s 0
created_at 2026-04-18T04:44:01.525739+00:00
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