Delete row sig_11ca9c607a36 from signals

id sig_11ca9c607a36
event_id evt_042cb753f0e8
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_f27db1bab ...
dedupe_key signal_enriched:news_delta:2c432df7f46c2cf9
throttle_s 0
created_at 2026-04-12T14:40:22.109642+00:00
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