Delete row sig_d78c78500e42 from signals

id sig_d78c78500e42
event_id evt_a446e8808388
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_a68c055bf ...
dedupe_key signal_enriched:news_delta:388116da0124d079
throttle_s 0
created_at 2026-04-17T09:00:15.745222+00:00
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