Delete row sig_9e1ec91730b7 from signals

id sig_9e1ec91730b7
event_id evt_19415f4814eb
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_8eb7f0c3a ...
dedupe_key signal_enriched:news_delta:1e4d9066c0a2be5f
throttle_s 0
created_at 2026-04-16T10:25:44.667739+00:00
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