Delete row sig_d3b26975b251 from signals

id sig_d3b26975b251
event_id evt_999a2d62e26f
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_e6cbf8164 ...
dedupe_key signal_enriched:news_delta:73326e1cad7b0046
throttle_s 0
created_at 2026-04-18T14:45:41.118414+00:00
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