Delete row sig_35418534f549 from signals

id sig_35418534f549
event_id evt_fabab2bcc139
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_145825158 ...
dedupe_key signal_enriched:news_delta:98b2daaf53f49a6c
throttle_s 0
created_at 2026-04-09T15:51:37.841832+00:00
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