Delete row sig_897f43051dd9 from signals

id sig_897f43051dd9
event_id evt_7d1207531db1
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_93bbdf371 ...
dedupe_key signal_enriched:news_delta:5919f61520afe610
throttle_s 0
created_at 2026-04-20T23:24:22.110438+00:00
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