Delete row sig_accb1d69f847 from signals

id sig_accb1d69f847
event_id evt_005f7872ebd8
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_b8c24fe24 ...
dedupe_key signal_enriched:news_delta:6010ba43f29cdf32
throttle_s 0
created_at 2026-04-18T13:04:29.291686+00:00
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