Delete row sig_4cc264d8bcdd from signals

id sig_4cc264d8bcdd
event_id evt_3ffd4f58324c
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_ff30e9842 ...
dedupe_key signal_enriched:news_delta:a76fac9d08451d51
throttle_s 0
created_at 2026-04-09T22:00:40.305688+00:00
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