Delete row sig_ac98bde2184e from signals

id sig_ac98bde2184e
event_id evt_b647ea09a0b8
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_7599b2d05 ...
dedupe_key signal_enriched:news_delta:2583c0d17cc88bbc
throttle_s 0
created_at 2026-04-21T22:00:08.787061+00:00
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