Delete row sig_f26685c9777b from signals

id sig_f26685c9777b
event_id evt_128b4773daef
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_a5b5a1326 ...
dedupe_key signal_enriched:news_delta:f093d6fb99e30d37
throttle_s 0
created_at 2026-04-15T22:57:59.664666+00:00
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