Delete row sig_55954b8c0cd2 from signals

id sig_55954b8c0cd2
event_id evt_b3c9b53be689
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T13:24:39.337890+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:755410519f2eea66
throttle_s 0
created_at 2026-04-12T13:24:39.337890+00:00
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