Delete row sig_f2ba221ef971 from signals

id sig_f2ba221ef971
event_id evt_21f915c8309c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T14:48:57.668292+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2ca99466a1961e4e
throttle_s 0
created_at 2026-04-10T14:48:57.668292+00:00
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