Delete row sig_89985a554ba8 from signals

id sig_89985a554ba8
event_id evt_7be8f7b605fe
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_9aa0b26b2 ...
dedupe_key signal_enriched:news_delta:b97b0c07ea346b04
throttle_s 0
created_at 2026-04-06T23:19:11.834467+00:00
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