Delete row sig_b537fda1b912 from signals

id sig_b537fda1b912
event_id evt_f56695b94735
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T02:50:28.137066+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c679a608f4167109
throttle_s 0
created_at 2026-04-11T02:50:28.137066+00:00
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