Delete row sig_f89a6704c7a3 from signals

id sig_f89a6704c7a3
event_id evt_c78c0f41feed
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_75b949bed ...
dedupe_key signal_enriched:news_delta:2ffb1f8b9e5ac616
throttle_s 0
created_at 2026-04-20T11:15:52.307482+00:00
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