Delete row sig_e989479c6dfd from signals

id sig_e989479c6dfd
event_id evt_a2935dcd8579
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_8f56f118c ...
dedupe_key signal_enriched:news_delta:53201195848af1d3
throttle_s 0
created_at 2026-04-17T21:07:05.417189+00:00
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