Delete row sig_a9381209ab75 from signals

id sig_a9381209ab75
event_id evt_d2b87d7e8e79
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_e8702e74b ...
dedupe_key signal_enriched:news_delta:c6d9f79c10a60e20
throttle_s 0
created_at 2026-04-20T10:15:21.760179+00:00
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