Delete row sig_7176ac961e9f from signals

id sig_7176ac961e9f
event_id evt_035fab995222
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_5bc6ba9e7 ...
dedupe_key signal_enriched:news_delta:0d34e00a30b876bc
throttle_s 0
created_at 2026-04-22T11:31:53.839177+00:00
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