Delete row sig_d55634cf5f9b from signals

id sig_d55634cf5f9b
event_id evt_3931ab83fe3b
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_683d1c507 ...
dedupe_key signal_enriched:news_delta:4883ad0eb226ba8a
throttle_s 0
created_at 2026-04-20T10:45:37.568310+00:00
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