Delete row sig_26c67563c01b from signals

id sig_26c67563c01b
event_id evt_bd436004b1a1
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_c7934747f ...
dedupe_key signal_enriched:news_delta:f170b0e33de73150
throttle_s 0
created_at 2026-04-09T15:01:33.387225+00:00
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