Delete row sig_4e3444311969 from signals

id sig_4e3444311969
event_id evt_bd6cfb8ffdce
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_7d25bcc71 ...
dedupe_key signal_enriched:news_delta:e2cbd741c78fb1d7
throttle_s 0
created_at 2026-04-18T00:22:58.444508+00:00
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