Delete row sig_52a7a2466644 from signals

id sig_52a7a2466644
event_id evt_5f58f41f782d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T18:24:34.472879+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0ca0f0deb91e1077
throttle_s 0
created_at 2026-04-19T18:24:34.472879+00:00
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