Delete row sig_2a7d1087724a from signals

id sig_2a7d1087724a
event_id evt_6162eb1e99f4
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_74e26cb50 ...
dedupe_key signal_enriched:news_delta:038470ee793a5dba
throttle_s 0
created_at 2026-04-10T21:57:54.741809+00:00
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