Delete row sig_176154339e31 from signals

id sig_176154339e31
event_id evt_17f1d9aff5bb
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_edfa2ce31 ...
dedupe_key signal_enriched:news_delta:e653e31c09afd7d2
throttle_s 0
created_at 2026-04-06T15:00:06.625356+00:00
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