Delete row sig_1efb095261d2 from signals

id sig_1efb095261d2
event_id evt_1832b23c997f
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_afaef7f9f ...
dedupe_key signal_enriched:news_delta:d7a6da656e4a0a05
throttle_s 0
created_at 2026-04-06T16:28:37.132657+00:00
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