Delete row sig_526b528f60e0 from signals

id sig_526b528f60e0
event_id evt_55fe1524b525
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T21:34:14.406275+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f3cf630e661e0dca
throttle_s 0
created_at 2026-04-08T21:34:14.406275+00:00
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