Delete row sig_4e5a16749947 from signals

id sig_4e5a16749947
event_id evt_6358dfbfbfb4
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_fc2d259ae ...
dedupe_key signal_enriched:news_delta:89b5eb13d864cbbc
throttle_s 0
created_at 2026-04-18T19:32:52.099258+00:00
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