Delete row sig_a280ef5a4cd0 from signals

id sig_a280ef5a4cd0
event_id evt_ff96f0b33203
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_63ef1c8c7 ...
dedupe_key signal_enriched:news_delta:b7f8c7fe96dad60d
throttle_s 0
created_at 2026-04-05T03:32:08.776751+00:00
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