Delete row sig_a9f9802a6bcd from signals

id sig_a9f9802a6bcd
event_id evt_77cd260d3e3e
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_582d407e1 ...
dedupe_key signal_enriched:news_delta:51cebe4d103de568
throttle_s 0
created_at 2026-04-22T04:11:05.571225+00:00
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