Delete row sig_eb04e444393b from signals

id sig_eb04e444393b
event_id evt_5711918cea49
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_1b05d0e2f ...
dedupe_key signal_enriched:news_delta:33eb8248ab7e6f85
throttle_s 0
created_at 2026-04-11T21:52:10.443362+00:00
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