Delete row sig_f2646d502efd from signals

id sig_f2646d502efd
event_id evt_a281dfe5b52f
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_6e70844ef ...
dedupe_key signal_enriched:news_delta:ec571d5e8952e90c
throttle_s 0
created_at 2026-04-20T05:38:20.489014+00:00
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