Delete row sig_68fa539a9346 from signals

id sig_68fa539a9346
event_id evt_1a1d77242ad1
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_2bb7bc13d ...
dedupe_key signal_enriched:news_delta:de9940f26f6f0fb7
throttle_s 0
created_at 2026-04-22T01:51:52.592764+00:00
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