Delete row sig_3ab816d06493 from signals

id sig_3ab816d06493
event_id evt_6be7dc6f8815
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_8909a4d0b ...
dedupe_key signal_enriched:news_delta:0c8609b5eb718a4c
throttle_s 0
created_at 2026-04-16T21:26:03.675869+00:00
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