Delete row sig_556d3c712eac from signals

id sig_556d3c712eac
event_id evt_9b7eb60dd5bc
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_6c5675c66 ...
dedupe_key signal_enriched:news_delta:eec7233a4b2ad990
throttle_s 0
created_at 2026-04-07T23:39:52.278824+00:00
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