Delete row sig_4444a78768e3 from signals

id sig_4444a78768e3
event_id evt_9d51128f0130
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_b03afa182 ...
dedupe_key signal_enriched:news_delta:1a06b3dee0003471
throttle_s 0
created_at 2026-04-08T05:19:26.491614+00:00
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