Delete row sig_a2bf3f99a191 from signals

id sig_a2bf3f99a191
event_id evt_90141e34010c
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_d23960571 ...
dedupe_key signal_enriched:news_delta:2831c18e62f95ac8
throttle_s 0
created_at 2026-04-19T15:38:58.592174+00:00
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