Delete row sig_e90dacf14549 from signals

id sig_e90dacf14549
event_id evt_431d99f91739
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T11:27:26.223418+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c0420e50c5b6ad83
throttle_s 0
created_at 2026-04-12T11:27:26.223418+00:00
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