Delete row sig_1a9b9e223092 from signals

id sig_1a9b9e223092
event_id evt_74e28d747721
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_d8ebfdb1f ...
dedupe_key signal_enriched:news_delta:87f38245410826ee
throttle_s 0
created_at 2026-04-09T15:51:37.963460+00:00
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