Delete row sig_186f471c231c from signals

id sig_186f471c231c
event_id evt_4e409bc2f2f3
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_6e2607b5d ...
dedupe_key signal_enriched:news_delta:d2d4ec1b6f90cb1c
throttle_s 0
created_at 2026-04-13T17:31:17.013741+00:00
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