Delete row sig_88d02775a1c2 from signals

id sig_88d02775a1c2
event_id evt_9c980ed425fe
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_488c651a9 ...
dedupe_key signal_enriched:news_delta:9a8d18eb3339a9d7
throttle_s 0
created_at 2026-04-19T18:38:57.137819+00:00
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