Delete row sig_b1993600f162 from signals

id sig_b1993600f162
event_id evt_00e56a7bc1b2
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_f1cf35e94 ...
dedupe_key signal_enriched:news_delta:7978880396f4fb8b
throttle_s 0
created_at 2026-04-06T07:12:24.594463+00:00
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