Delete row sig_ea4fa1c32758 from signals

id sig_ea4fa1c32758
event_id evt_53df6e3ab499
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_e95a72ba9 ...
dedupe_key signal_enriched:news_delta:d056d243e5952743
throttle_s 0
created_at 2026-04-11T06:03:59.788806+00:00
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