Delete row sig_ecfd5303327d from signals

id sig_ecfd5303327d
event_id evt_9b974b59fdf8
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_806515333 ...
dedupe_key signal_enriched:news_delta:55099fd6295e2eeb
throttle_s 0
created_at 2026-04-15T09:03:25.510138+00:00
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