Delete row sig_f89bb5f9a112 from signals

id sig_f89bb5f9a112
event_id evt_28738b8b2e52
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_eea558520 ...
dedupe_key signal_enriched:news_delta:20e311aadb5fe0d8
throttle_s 0
created_at 2026-04-19T20:59:43.931390+00:00
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