Delete row sig_be749c796b71 from signals

id sig_be749c796b71
event_id evt_6cb7f3f3d956
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_52aa01a09 ...
dedupe_key signal_enriched:news_delta:3108889f2cf4dc87
throttle_s 0
created_at 2026-04-21T04:44:49.980858+00:00
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