Delete row sig_86555ca24fb1 from signals

id sig_86555ca24fb1
event_id evt_b70d2c3177f7
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T09:01:05.553496+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:724d748d7ce10865
throttle_s 0
created_at 2026-04-22T09:01:05.553496+00:00
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