Delete row sig_678647bc75d7 from signals

id sig_678647bc75d7
event_id evt_31eb9fbd3f5f
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_f6991d30f ...
dedupe_key signal_enriched:news_delta:4e37c9f2b47a347c
throttle_s 0
created_at 2026-04-16T07:39:06.962245+00:00
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