Delete row sig_0ebd055213bb from signals

id sig_0ebd055213bb
event_id evt_8a8178b977e0
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_ab55871b6 ...
dedupe_key signal_enriched:news_delta:90ca91b7f2eaf884
throttle_s 0
created_at 2026-04-17T20:17:19.280843+00:00
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