Delete row sig_d4453b4326ce from signals

id sig_d4453b4326ce
event_id evt_ec090174ae5b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T23:51:22.090800+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:604df6e97283fe3e
throttle_s 0
created_at 2026-04-17T23:51:22.090800+00:00
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