Delete row sig_644f18991e5e from signals

id sig_644f18991e5e
event_id evt_b506b612067d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T21:54:46.470423+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fece1247ff6537ad
throttle_s 0
created_at 2026-04-20T21:54:46.470423+00:00
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