Delete row sig_1ebdf12bbd40 from signals

id sig_1ebdf12bbd40
event_id evt_9925b81fa857
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_685030f0f ...
dedupe_key signal_enriched:news_delta:0255f2b4edff8732
throttle_s 0
created_at 2026-04-09T05:26:03.081928+00:00
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