Delete row sig_a9b67e261382 from signals

id sig_a9b67e261382
event_id evt_863d34643ee8
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_a105b6f07 ...
dedupe_key signal_enriched:news_delta:c93106f21b519592
throttle_s 0
created_at 2026-04-18T03:12:07.395305+00:00
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