Delete row sig_e30259d49dc3 from signals

id sig_e30259d49dc3
event_id evt_51e4e16bbfa2
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_4ed37fe65 ...
dedupe_key signal_enriched:news_delta:4e74e3339f118142
throttle_s 0
created_at 2026-04-22T04:56:34.612310+00:00
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