Delete row sig_8026186fd6ca from signals

id sig_8026186fd6ca
event_id evt_c811c817340e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T11:48:46.410207+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7f3a309e20f69573
throttle_s 0
created_at 2026-04-18T11:48:46.410207+00:00
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