Delete row sig_178f6e775b36 from signals

id sig_178f6e775b36
event_id evt_ed021851f551
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_5f6ec706f ...
dedupe_key signal_enriched:news_delta:24163b27a819601a
throttle_s 0
created_at 2026-04-20T18:43:38.216462+00:00
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