Delete row sig_818ebab62822 from signals

id sig_818ebab62822
event_id evt_617330e9b739
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_fbf02e21f ...
dedupe_key signal_enriched:news_delta:45e66e243e2c53f6
throttle_s 0
created_at 2026-04-08T11:43:27.477003+00:00
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