Delete row sig_678d89d60ebe from signals

id sig_678d89d60ebe
event_id evt_ececd0419c01
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_784e328fc ...
dedupe_key signal_enriched:news_delta:2b2b4e3145c4d60d
throttle_s 0
created_at 2026-04-20T12:32:35.261570+00:00
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