Delete row sig_c05d539b880e from signals

id sig_c05d539b880e
event_id evt_6a6a574e0391
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T07:19:47.971862+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d2d9bb9bb93246e8
throttle_s 0
created_at 2026-04-20T07:19:47.971862+00:00
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