Delete row sig_15611ff4a95f from signals

id sig_15611ff4a95f
event_id evt_799dd71ed0dd
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_8fd2c612f ...
dedupe_key signal_enriched:news_delta:1e9b5cbfd5e80346
throttle_s 0
created_at 2026-04-08T21:48:34.460581+00:00
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