Delete row sig_f820fefed9c4 from signals

id sig_f820fefed9c4
event_id evt_3fe4b24c41c9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T04:13:35.223304+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cd02d4725dbb697f
throttle_s 0
created_at 2026-04-20T04:13:35.223304+00:00
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