Delete row sig_921976a29708 from signals

id sig_921976a29708
event_id evt_446b96cac0b6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T08:26:36.423727+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a4a7e51e166511e9
throttle_s 0
created_at 2026-04-12T08:26:36.423727+00:00
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