Delete row sig_6976f2515e1a from signals

id sig_6976f2515e1a
event_id evt_54d825f8236d
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_48c23ce56 ...
dedupe_key signal_enriched:news_delta:e2eb2e3a5338a42e
throttle_s 0
created_at 2026-04-10T03:46:52.354687+00:00
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