Delete row sig_a26c2c6a6fb1 from signals

id sig_a26c2c6a6fb1
event_id evt_3b672830fc73
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_ac3ab93c5 ...
dedupe_key signal_enriched:news_delta:b27d374fa0fc5c0e
throttle_s 0
created_at 2026-04-19T14:09:17.907001+00:00
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