Delete row sig_b26834790f89 from signals

id sig_b26834790f89
event_id evt_77287a83a33a
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_b4150f7fb ...
dedupe_key signal_enriched:news_delta:9cd095fcc111e062
throttle_s 0
created_at 2026-04-15T18:57:35.267307+00:00
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