Delete row sig_affc977fe536 from signals

id sig_affc977fe536
event_id evt_3ef6551c380f
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_5e7d57910 ...
dedupe_key signal_enriched:news_delta:ba4500df620cce19
throttle_s 0
created_at 2026-04-10T16:36:01.265450+00:00
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