Delete row sig_968e1816ecc2 from signals

id sig_968e1816ecc2
event_id evt_868c51ab91a7
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_ddedfae91 ...
dedupe_key signal_enriched:news_delta:4cdaa992d0b9b33a
throttle_s 0
created_at 2026-04-13T01:10:18.748481+00:00
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