Delete row sig_05f84083ad83 from signals

id sig_05f84083ad83
event_id evt_c4de0de19989
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T11:07:22.448328+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:15ca2c9a849a88cc
throttle_s 0
created_at 2026-04-18T11:07:22.448328+00:00
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