Delete row sig_abc972e94dbf from signals

id sig_abc972e94dbf
event_id evt_9b619dcca91f
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_270c49d49 ...
dedupe_key signal_enriched:news_delta:36bcb0976176557a
throttle_s 0
created_at 2026-04-06T17:58:09.745015+00:00
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