Delete row sig_4893c1194725 from signals

id sig_4893c1194725
event_id evt_b932f260cc5a
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_f7ab02b26 ...
dedupe_key signal_enriched:news_delta:11a199c43ffb4d3f
throttle_s 0
created_at 2026-04-18T10:48:11.534548+00:00
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