Delete row sig_289fec25d372 from signals

id sig_289fec25d372
event_id evt_48069fe26bde
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_ce6a1fcce ...
dedupe_key signal_enriched:news_delta:b0c7640574d4a9da
throttle_s 0
created_at 2026-04-16T22:05:26.423749+00:00
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