Delete row sig_4553d2a6bd97 from signals

id sig_4553d2a6bd97
event_id evt_ae01845c973c
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_8ab992760 ...
dedupe_key signal_enriched:news_delta:d40ad6e8fd677583
throttle_s 0
created_at 2026-04-20T16:27:43.178619+00:00
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