Delete row sig_9ecf18a20c13 from signals

id sig_9ecf18a20c13
event_id evt_5b30f942166f
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_443078e60 ...
dedupe_key signal_enriched:news_delta:6977bc9945f31297
throttle_s 0
created_at 2026-04-20T10:15:21.929354+00:00
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