Delete row sig_74e02897a97d from signals

id sig_74e02897a97d
event_id evt_2ca6297ed637
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T05:54:45.973247+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fb6534d840d99118
throttle_s 0
created_at 2026-04-08T05:54:45.973247+00:00
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