Delete row sig_5e1afb77d6e3 from signals

id sig_5e1afb77d6e3
event_id evt_c1bce9100373
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_b6f773b75 ...
dedupe_key signal_enriched:news_delta:cad2a94fdb7fcdd1
throttle_s 0
created_at 2026-04-17T21:46:23.875226+00:00
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