Delete row sig_e76f9aaa8940 from signals

id sig_e76f9aaa8940
event_id evt_04129cb2c789
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_fc0173475 ...
dedupe_key signal_enriched:news_delta:c7cd3c72b543817d
throttle_s 0
created_at 2026-04-21T00:02:03.741581+00:00
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