Delete row sig_81f086f0db81 from signals

id sig_81f086f0db81
event_id evt_c6740ded7c86
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T07:56:05.694887+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:201506294c4505bb
throttle_s 0
created_at 2026-04-13T07:56:05.694887+00:00
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