Delete row sig_da86b09f0311 from signals

id sig_da86b09f0311
event_id evt_c9ecf1a07774
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_2b4a985e8 ...
dedupe_key signal_enriched:news_delta:3442a0617b5655b5
throttle_s 0
created_at 2026-04-18T16:34:30.754950+00:00
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