Delete row sig_abbec9e997cb from signals

id sig_abbec9e997cb
event_id evt_737bc73cc526
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_7bb99f9b7 ...
dedupe_key signal_enriched:news_delta:99a16401d34f33c4
throttle_s 0
created_at 2026-04-10T13:08:04.366778+00:00
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