Delete row sig_7475d2199303 from signals

id sig_7475d2199303
event_id evt_749cdf695bcb
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_2e8a82947 ...
dedupe_key signal_enriched:news_delta:5e6ea422a039b625
throttle_s 0
created_at 2026-04-22T11:16:45.404195+00:00
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