Delete row sig_67869bd029e7 from signals

id sig_67869bd029e7
event_id evt_1bb71fb724ad
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_e833cf4a7 ...
dedupe_key signal_enriched:news_delta:2ada714f895cac75
throttle_s 0
created_at 2026-04-11T16:31:47.439521+00:00
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