Delete row sig_878bf72a5efd from signals

id sig_878bf72a5efd
event_id evt_b90840cbbaa8
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_b369eace1 ...
dedupe_key signal_enriched:news_delta:460287761264ec6c
throttle_s 0
created_at 2026-04-09T09:54:21.891824+00:00
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