Delete row sig_a011da885184 from signals

id sig_a011da885184
event_id evt_6913265c9c59
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T22:22:38.314884+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f6a6cfce04701629
throttle_s 0
created_at 2026-04-17T22:22:38.314884+00:00
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