Delete row sig_f6cc56f4cb11 from signals

id sig_f6cc56f4cb11
event_id evt_d51bb85eaf4f
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_a76f5b1fa ...
dedupe_key signal_enriched:news_delta:8cd7e422c7aee18b
throttle_s 0
created_at 2026-04-19T06:39:15.560679+00:00
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