Delete row sig_75e98c653e59 from signals

id sig_75e98c653e59
event_id evt_b488900b10b4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T00:42:20.382492+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9809585e945dfdf7
throttle_s 0
created_at 2026-04-22T00:42:20.382492+00:00
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