Delete row sig_a4cc46eabaa6 from signals

id sig_a4cc46eabaa6
event_id evt_743638a7b606
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_78151ddc8 ...
dedupe_key signal_enriched:news_delta:c09ea53e209569e2
throttle_s 0
created_at 2026-04-07T04:04:22.036884+00:00
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