Delete row sig_f54b4b033d2e from signals

id sig_f54b4b033d2e
event_id evt_5222cf6abd3d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T03:41:05.775875+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e5ceb5f0eab28338
throttle_s 0
created_at 2026-04-11T03:41:05.775875+00:00
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