Delete row sig_52ad66a61dbd from signals

id sig_52ad66a61dbd
event_id evt_85a002433753
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T16:27:25.582242+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:34b82c203b027e4c
throttle_s 0
created_at 2026-04-20T16:27:25.582242+00:00
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