Delete row sig_75d69a9fd97b from signals

id sig_75d69a9fd97b
event_id evt_d2f0919d3d32
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_5429301d9 ...
dedupe_key signal_enriched:news_delta:11da36bfcefc0db0
throttle_s 0
created_at 2026-04-19T09:01:05.849208+00:00
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