Delete row sig_8fec69d04436 from signals

id sig_8fec69d04436
event_id evt_d1fae74c6880
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_3b24d5792 ...
dedupe_key signal_enriched:news_delta:d42939c01ab79a15
throttle_s 0
created_at 2026-04-08T21:48:34.575086+00:00
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