Delete row sig_676d298e6e3a from signals

id sig_676d298e6e3a
event_id evt_de2b1adc5b9e
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_62875a6f9 ...
dedupe_key signal_enriched:news_delta:0713cc0f92750a2a
throttle_s 0
created_at 2026-04-20T06:38:56.327896+00:00
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