Delete row sig_fceb363d592a from signals

id sig_fceb363d592a
event_id evt_f3c5d303eaf0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T06:56:23.845047+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:38c52ecedb3bb9f1
throttle_s 0
created_at 2026-04-08T06:56:23.845047+00:00
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