Delete row sig_edda3a4b2953 from signals

id sig_edda3a4b2953
event_id evt_ca7572d8e722
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_743195af7 ...
dedupe_key signal_enriched:news_delta:2ab20e609ee6f5d0
throttle_s 0
created_at 2026-04-08T07:21:41.267091+00:00
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