Delete row sig_abd2f93c05b2 from signals

id sig_abd2f93c05b2
event_id evt_f386f61377c0
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_7609f4503 ...
dedupe_key signal_enriched:news_delta:81f64fdabc3ad318
throttle_s 0
created_at 2026-04-19T20:59:43.950916+00:00
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