Delete row sig_a455e58a593d from signals

id sig_a455e58a593d
event_id evt_1dbe57f5d466
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T02:39:00.380601+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:353e982326149cec
throttle_s 0
created_at 2026-04-13T02:39:00.380601+00:00
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