Delete row sig_556bfcdff59c from signals

id sig_556bfcdff59c
event_id evt_8ad12bfdf2cb
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_dab6bae90 ...
dedupe_key signal_enriched:news_delta:37409ddaf3058e90
throttle_s 0
created_at 2026-04-18T14:05:04.272398+00:00
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