Delete row sig_d3fe55691a98 from signals

id sig_d3fe55691a98
event_id evt_5f13e4b5edc7
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_1cd7abb77 ...
dedupe_key signal_enriched:news_delta:ed5698a830b852fa
throttle_s 0
created_at 2026-04-20T23:24:22.136874+00:00
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