Delete row sig_2c926c4751c5 from signals

id sig_2c926c4751c5
event_id evt_2614562eabcd
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_1ffb75ac7 ...
dedupe_key signal_enriched:news_delta:995eac29779bc9c6
throttle_s 0
created_at 2026-04-20T03:04:57.244903+00:00
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