Delete row sig_e5ec476c7e9a from signals

id sig_e5ec476c7e9a
event_id evt_b5c85352d92b
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_352977e0c ...
dedupe_key signal_enriched:news_delta:c9d5b99d3d84de98
throttle_s 0
created_at 2026-04-18T14:45:41.109481+00:00
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