Delete row sig_9ffdf2b6d6be from signals

id sig_9ffdf2b6d6be
event_id evt_6ed8587c2cf5
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_badc07328 ...
dedupe_key signal_enriched:news_delta:9ae2107b4e3787d4
throttle_s 0
created_at 2026-04-18T03:42:55.326332+00:00
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