Delete row sig_d88a227ca3b6 from signals

id sig_d88a227ca3b6
event_id evt_564ee9b401b9
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_3031584d2 ...
dedupe_key signal_enriched:news_delta:44fffb511430a0e3
throttle_s 0
created_at 2026-04-06T15:00:06.665413+00:00
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