Delete row sig_c8d090cb9d1f from signals

id sig_c8d090cb9d1f
event_id evt_afaa4196a7d5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T06:25:03.686392+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3109c48815530de5
throttle_s 0
created_at 2026-04-08T06:25:03.686392+00:00
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