Delete row sig_7249519adfbb from signals

id sig_7249519adfbb
event_id evt_fd99b2863e59
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_ce50b8c43 ...
dedupe_key signal_enriched:news_delta:2c7021c1580bf28c
throttle_s 0
created_at 2026-04-14T10:49:41.406681+00:00
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