Delete row sig_556a6c17535e from signals

id sig_556a6c17535e
event_id evt_61b78a9d825a
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_8d2f124e9 ...
dedupe_key signal_enriched:news_delta:5ad60aaa18871256
throttle_s 0
created_at 2026-04-09T13:30:33.014520+00:00
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