Delete row sig_c4e4e26172cd from signals

id sig_c4e4e26172cd
event_id evt_5082e68432fe
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_ca9aba892 ...
dedupe_key signal_enriched:news_delta:553b3dc257f24097
throttle_s 0
created_at 2026-04-12T10:53:06.394263+00:00
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