Delete row sig_88541311098f from signals

id sig_88541311098f
event_id evt_6c4aa7fe7816
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_ff90aed81 ...
dedupe_key signal_enriched:news_delta:e0aa10542400c930
throttle_s 0
created_at 2026-04-11T05:25:13.454553+00:00
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