Delete row sig_d64b4fd73191 from signals

id sig_d64b4fd73191
event_id evt_ecc8a8b19880
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T10:56:34.972034+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5b080701bdd7f2d4
throttle_s 0
created_at 2026-04-15T10:56:34.972034+00:00
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