Delete row sig_227ecc07104d from signals

id sig_227ecc07104d
event_id evt_3cfd3c598b78
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_875dc707b ...
dedupe_key signal_enriched:news_delta:be539e06a64ebf2c
throttle_s 0
created_at 2026-04-22T04:11:05.843997+00:00
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