Delete row sig_3634005451ca from signals

id sig_3634005451ca
event_id evt_cfc46846c38a
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_c51bc1e1c ...
dedupe_key signal_enriched:news_delta:59520d0fe9d5e5e7
throttle_s 0
created_at 2026-04-17T23:19:07.140649+00:00
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