Delete row sig_e4167501003c from signals

id sig_e4167501003c
event_id evt_dd403b5e5485
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_330a41873 ...
dedupe_key signal_enriched:news_delta:d82a89757413647d
throttle_s 0
created_at 2026-04-22T15:19:29.489030+00:00
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