Delete row sig_15c78ec6d897 from signals

id sig_15c78ec6d897
event_id evt_7982ab08fa90
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_61a95cfab ...
dedupe_key signal_enriched:news_delta:4b07e8984b48db2a
throttle_s 0
created_at 2026-04-21T03:02:40.612709+00:00
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