Delete row sig_55afb186b315 from signals

id sig_55afb186b315
event_id evt_0211d06dcd4d
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_30f5ec4cb ...
dedupe_key signal_enriched:news_delta:809224fbfdd65488
throttle_s 0
created_at 2026-04-19T00:02:36.054460+00:00
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