Delete row sig_8cacbc2502d4 from signals

id sig_8cacbc2502d4
event_id evt_a02abcd7c27b
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_7a1615742 ...
dedupe_key signal_enriched:news_delta:6a2a5e5185580c92
throttle_s 0
created_at 2026-04-06T20:42:08.626572+00:00
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