Delete row sig_fd774e2f0013 from signals

id sig_fd774e2f0013
event_id evt_fed2e636ff79
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_cd1cd68a5 ...
dedupe_key signal_enriched:news_delta:d8ccce9251e75e02
throttle_s 0
created_at 2026-04-17T17:17:12.951380+00:00
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