Delete row sig_5e4a69686693 from signals

id sig_5e4a69686693
event_id evt_f790a02346de
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_bf10f817d ...
dedupe_key signal_enriched:news_delta:e39b33dfc918157c
throttle_s 0
created_at 2026-04-19T10:31:33.033095+00:00
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