Delete row sig_93d8310052b8 from signals

id sig_93d8310052b8
event_id evt_7c86b52c2edf
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_4ddcc2d4a ...
dedupe_key signal_enriched:news_delta:28c1df51af68e41a
throttle_s 0
created_at 2026-04-20T16:27:43.364772+00:00
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