Delete row sig_893566689473 from signals

id sig_893566689473
event_id evt_dfdb84254345
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_802155220 ...
dedupe_key signal_enriched:news_delta:7f0ee26eca735b91
throttle_s 0
created_at 2026-04-15T00:42:40.261708+00:00
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