Delete row sig_e736142626d5 from signals

id sig_e736142626d5
event_id evt_b1a2ff3d5340
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_09ca4ca4e ...
dedupe_key signal_enriched:news_delta:f59c140cf6290960
throttle_s 0
created_at 2026-04-22T13:02:43.094764+00:00
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