Delete row sig_289fa70c0d00 from signals

id sig_289fa70c0d00
event_id evt_d8f516aa8f1e
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_d55115153 ...
dedupe_key signal_enriched:news_delta:ca3a032bc0dc447f
throttle_s 0
created_at 2026-04-21T19:56:17.288232+00:00
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